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Page 1: $#NQGQ$-,/.R&S #M9NI47 T.H6 F.HGI.B7dainesea/theses/DaineseTesiLaurea.pdf · -,/.102"3.547698%4;:< =(>43?@ A(>.B"DC94'E2 F.HGI.H"DC94 4KJL A(>M9NO +&H. P $#NQGQ$-,/.R&S

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Q 1<C ) .9. )0)-46;82';8; * : * . * = 7 * 0 481 >B)0>S: 7. 13)01 V : 2 C;9)W( 7 U 13)'0 * (1C"25;9461J> * :3: * . 48;62'0 * C * ; C"25;94 * >B1JC"2'0@4 * 2 ;625C13(1A4 >2L> * 0@46;82': * >S; * . > *("2C 2 :; 130>S; ** 0@48) >* C1 >7 C;9)0 7 0>B132546)KC * ; C"2'; 4613> * :J: * >B)0 C1 >7 (1 7 0"2 7 01J4 >2K(1 . 46;82D0 *BUSU 2 * ( >* (1GC1 >7 (1 7 0 );9(130 * (1?=;62'0( *BUSU 2-0 * :?>B2 . )( * :J: 2 X $ * 0@46;9) 1J: ;62'0= * Y ] && & 4 7 48481 =:31 >S; * . >B)'0) C;9)C ); U 13)0"25: * 0@4 * 25:0 7 H* ;8)(1<C"2'; 4 * >B13C2'0@461 $

N :Z>B) CO)';94 2 H* 0 48) ( * :3: * [ * ( * :J: * X >B)'0 48;62'((13> * : * C; *' 1 . 13)'01Z( * 1 )W( * :3:J1`2 =@2 .25(;8)013>B) & 1J0 > 7 1O: 2C;9)W( 7 U 1J)0 * (1+2'0@461 25;813)'01 7 :J481AD . 46;82'01 >* . )CC; * .8. 2(2':3: * 2 . D. * . *BU 13)01"(<; 7 ; 46) * 13: 1 24846)> $* 0 * :3: *#! 7 24846;9) >S: 2 .9. 1"(1 J' 1 . 1 2 C;8)'CO); U 1J)0"2':J1J4 >2c P

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( * =:J1 2'1 : >B);9;81 . C )0( * 2 >B1 >)L> $* >B1 . 12 . C * 484 * ; * * . * 1 ! 7 25; . 46;82'011 ) .8. * ;8)130 *! 7 13:31 ;81J),130 7 0 . 4 2548)H( * >B)0 7 0"2548)H(1 7 25;D : 7 )'0 :32 . 2 $N :G=;82 7 >B) #$76 H* 484 * 130 : 7 > * :; 1 CO); 4 2'0 U 2( * :J: 2 . > 2':32(1O> * 0@48;62':J1J4 >2 +2 .9. * );91 USU )0@4 25: *0 * 1W=;62 7 >B1( * =:J1 . )'C;625494 7 4946) 0 * :C"2 .9. 2'='=13)L48;62 . 1 . 4 * 1C;8)1 * 484813: * D * ; . 2'=':313)/(1AD'* ; . 1 C;8)'48)0 * D 0 7 >B: * ) * C1J) )5D C13) ) $ 246)> $* :3) . >S)CO) ( * :3: 2 . C * ;81 * 0@462 U 1J)0 *>B)0=:J11J)01 C * . 2'0@461 7 :J48;62D ; * :325461 ' 1 . 4813>S1 >*#! 7 * :3:J) (1 H* 484 * ; * 1J0 *' 13( * 0 U 2 :32 46;82'0 . 1 U 1J)0 *(1 1 2 . * ("2':3:32 254 * ;91 22'(;9)013>B2 25: C: 2 . 2(1 ! 7 2'; * =: 7 )'01 &>* 1 CO)';94 250 4 * :3) . 4 7 (13)* 13: >S)0 1 ;9)0@46) (1 . >B2': * (1> * 0 48;62':J1J4 >2 (1 '* ; . * C * ;> * ;8>B2'; * (1 . 4 7 (1 2'; *,! 7 2':J1 . 1 2'0) 1C"2';62 H* 46;81G)CC );94 7 01<C * ; ( * . >B;91 ''* ; * :3) . 4 2548)( * : . 1 . 4 * 2 $

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* :> 2'C1J46)':3)T130@46;9)W( 7 48481 ' ) .87 : .& 254848;62 '* ; . ) :; 130@4 * =;62 U 13)'0 * 46;62 1`;81 .97 :J4625461 ( * :3:32 .87 ; * 4613>S):3) * >S)0 . 13( * ;62 U 13)01M(1 0"254 7 ;62K4 * ; ) (1302 1J> 2 & . )0) . 4 24 *5* .8. * 130* ' 13( * 0 U 2: * >B2';625494 * ;81 . 461J> $* ( * : . 1 . 4 * 2> $* C ); 4 2'0)-25:3: 248;62'0 . 1 U 13)0 * (1 1 2 . * V

]$ * : * ' 254 2( * 0 . 1A4 >2(1 * 0 * ;8='1 2( * :J: 2 + 2& bW$ * . 4 * 0 . 13)0 * ( * :J: 2 ; * ='13)0 * 2'( 2':A4 2( * 0 . 1J4 >2 * 0 * ;8= * 461J> 2 .97! >B1 * 0@4 * 2>S)0 . * 0@461J; * 1J:;62'=='1 7 0='1 * 0@46),( * :3:-; *! 7 13:J1 ;913) 4 * ; ) (1302 1J>B) ( * : . 1 . 4 * 2 $

" 2 C;81 2 > 2';825484 * ;91 . 4813>B2 >* (1 4613C )$#&% / %!'# )( & 130 1 2548481/: 2 ( * 0 . 1J4 >2 (1 * 0 * ;8=132 >* 7 0"2C;8)C;91 * 4 >2H:J)W>B2': * ( * : . 1 . 4 * 2 * C 7 >) * .8. * ; * ( * 7 01A4 2HC 7 0@46) C * ;LC 7 0@46) : 2 . * >S)0("2 >*&1J0 '* > * & 7 0"2 ' 2';8132 1J: * ' %!'# * > 25;625494 * ;91 USU 2: 2 + 2& 0 * : .97 )H>S) C: * .8. ) $N :0 7 * ;8) (1 +* # % # >* 7 0"2 ' 2';8132 1J: ** . 4 * 0 . 1 ' 2 : * =@24 2TC1 >7 (13; * 48462 H* 0@4 * 2':3: *(1 * 0 . 13)01O( * :J: 2, + 2& * 25:3: 2 .97 2 * 0 * ;8=13248)'4 25: * > $* 2':J: 2( * 0 . 1A4 >2-(1 * 0 * ;9=1 2 $- ; . 4 25462 C;8)C ) . 4 2/. b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a`cb ; * 0 0); 25:31 USU 2'0):; * 0 * ;8=132,( * :J: 2 + 2& ;91 . C * 4846)-25:3:;I2'; * 2,(1 . ) ' ;82'CC ) . 1 U 1J)0 *( * 1<0 7 >S: * 1G0 * :<C1 2'0),48;62 . '* ; . )):A46; * > $* .87 :J: 2>S)W)';8(1J0"254 2 : 7 0='),13: 1 2 . >S13) $ 2546),> $* &0 * : . 1 . 4 * 2 (1 ;91 1 * ;91 * 0@46)K( * : > * 0@46;9)T(1 2 .8. 2 & 1 ( 7 * 0 7 >B: * 1 1J0>B1J( * 0@461 . )0) 1 )';94 * D* 0@4 * >B)0@48;62549461G0 * :3:32 (1J; *SU 13)'0 * ( * : 1 2 . >B1J) Ede & : 2 ( *7 01 U 1J)0 * (1 7 0"2,( * 0 . 1J4 >2 (1+* # % # .87 C * ; 7 >B132': *J>* C; * 1 * ;91J4 225( 7 02( * 0 . 1A4 >2 ' )': 7 * 48;813>B2 $ * : . * = 7 1J46) >* ( * . >S;81J4946) :3) . 4 7 (13)/( * :3:32 ( * 0 . 1J4 >2 ( * 1 +* # % #<C * ;?1 . 1 . 4 * 15C;8)1 * 494613: * D * ; . 2'=':313) (1f[] 6 * : 2 ( * 4 * ; 1J0"2 U 13)0 * ( * :3:32 ( * 0 . 1J4 >2 2 C"25;9461J; * ("25:3:3) . C * 4848;8) (1 ):A4 * C:313>S1J4 >2 1 .87 ;82546) $ " ) . >S)CO)( * :J:;I2'0"2':J1 . 1 >*c! 7 * :3:3) (1 '* ;81 7 > 2'; * . * : 20 7 ) ' 2 . > 25: 2. 1 2KC * ; 461J0 * 0@4 * ("2': C 7 0@46) (1 ' 1 . 4 2 7 . 13>S) * . * 13: >B)0 1 ;8)0@46) 48;62K1J: 0 7 H* ;8) (1 /+* #&g % # * : 2( * 0 . 1J4 >2 C ) .9. 2("25; * 130(1J> 2 U 13)01C * ; :32 . > * :J462 ( * :3: 2 . > 2':32 (1R> * 0@46;625:31J4 >2C1 >7 . 1J=01 7 > 25481 ' 2 $ d &

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* : 1 ); 2':31 . ) ( * : )W( * :3:J) (1 : 2 7 O* ; & : 2 %!'# "! ( * ' )# +* # % #TC * ;7 0"2 >B):J:31 . 13)'0 * (1 7 0 C;9)1 * 484813: *M_ .87 7 0 * ; . 2'=':313) ] >* ( * 7 01A4 2 130 )W() ):A46)(13; * 4848) (1$# * ; * 0 U 132'0() ;81 . C * 4946) 25:3:; * : ** 0@46) (1 .97 C * ; 7 >S1 *&% 8 0 * : C132'0) 46;82 . ''* ; . ):; * . C; * .9. 1J)0 * #$%b c Z> $* ( >21J:<0 7 H* ;8) * (1J)(1 /+* # % # 2 7 .8. 2546)(' V

) *' X 8 ,+ % + *' % 8 +.- /10 8 32 ]54 . ]47698 /1: *' 4 8 0 :;5<<= />: ?' 4 8 2 ]4 . ]47698 /10 8 0 0 ; #$I## : 2 ( * 0 . 1A4 >2 :3) > 25: * (13C * 0( * ("2': C"25;62 * 48;8) (l; 1 C"254946)@' * ("2':J: 2 C ) . 1 U 1J)0 * 0 * : C132D0) 48;62 . '* ; . ) 8 ^> 1 ; $ 7 = 7 ;62 #$ b ^;813>S);8(1 2 )T> $* 698 >* : 2 . *BU 13)0 * (l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dZId b 1 & C2';81M2':3:32[ : 2';9= $*BUSU 2 2H*SUBU 2T2':A4 *SUBU 2]\ ( * :3:32 (1 . 46;91 7 U 13)0 * 7 = 7 ;62 #$ $GN 0 1 7 0 U 13)'0 * ( * : C2';62 * 48;8)T(l; 1 DC"254848)_^ & . 1 )'48481 * 0 * -HGQIK*LNMRO + b Wa` 2';9>B>S) .cb !`dfe 4 ^hg W ` 4 b !`ie $ 7 * . 4 2 * . C; * .8. 13)0 *4 * 0( * ;62'C13("2 * 0@4 * 2 UB* ;8) ! 7 2'0()(^j b W &* 0@46; * & >S) H* . 1 ''* ( * 1J0 7 = 7 ;82 #$ 4 l& 1J:0 7 H* ;8) * (1J) (1 +* # % # ' 2 2 UB* ;8)TC * ;^e ] c 1 0 * : > 2':J>B):J) 2':J: 2 :32 7 * ;. 1Z481 * 0 * >B)0@46) ( * :3:32k)# lmT' % '+' ( * :J: 2 ; * =1J)0 * C * ;91 1 * ;913>B2 ( * : 0 7 >S: * ) $ * : . * = 7 1J46). 1 '* (; >2 >S) H* :;I2'; * 2 * # * 48481 ' 2 (1 . ) ' ;82'CC ) . 1 U 1J)0 * . 1 2 O* 0 (1 '* ; . 2 ("2 ! 7 * :J: 2 . 481AD 25462 ("2 7 0 >S) . > n . * C:31J> *5 )W( * :3:J) = * ) H* 46;913>B) * . 1 2 >B) 7 0 ! 7 *J )':J46) (1 >B1J: * ("2! 7 2'0@461 7 > 2'; * $

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" 2( *7 01 U 1J)0 * 2':J4 * ;8025461 ' 2-2'()'4846254 2 >* )'494 * 0 7 4 2K2C"2'; 4613; * ("2':3:32( *7 01 U 1J)0 * 2 1ED4 7 2': * (1 * (1 2 C * . 25462 (1 7 0"2 1 7 0 U 13)'0 *H* 1 2 7. ) ( * :J: 2 ( * 0 . 1A4 >2 :J)W>B2': * . 4 * .8. 2 >B) *1 7 0 U 1J)0 * (1<C * . )V ) *' + % 8 . ) *' X 8 0 `

% 8 ) ?' X 8 Z #$%# c 7 * . 462 ( * 7 01 U 13)0 *4$ 2 2'0> $* 1J: ' 2'0@4 2'=='13)> $* :32 ; * ='13)0 * C1 >7 > * 0@48;62': * ^() '* : 2 7 . 1J> 2>* C1 >7 130@4 * ; * .8. 2'0@4 * $ 2 7 0 C * . ) 2'==1J); *&' 1 . 46)K> $* : 2-( * 0 . 1A4 >2H:J)W>B2': *Y' 1 ;62'=='1 7 0= *1 ' 2':J);81OC1 >7 * : *' 25481 $ = IRC@LPIRL = 6 = IR:E;G:RC@L

N : > 2':J>B):J) 250"2':31A461J>B) ( * :J: 2 ( * 0 . 1J4 >2 H* (1 2 (1 ( mJ%B %9m *'+( % 130 1 7 0 U 1J)0 * ( * :ZC2D;82 * 46;9) (l; 1 C"254848) ( * :J: 2K>S):3:J1 . 13)0 *,>* . 462546) * # * 494 7 246) 130@4 * =;62'0() 0 7 H* ;81J> 2 * 0@4 * $ * ; 4 2': * >B2':3>S):3) 1 . )0) . * ; ' 1J48) 2'0>B);82 ( * : 1 )'; 2':31 . ) ( * : )W( * :3:J) (1 :32 7 * ; &. > * =:31 * 0() ("2':J: 2 : * 484 * ;6254 7 ;62 1 C"2';62 H* 46;81/( * :3:32 (1 . 48;81 7 U 1J)0 * (1 [ )W) (WD Q 2VUW)0 ( * 10 7 >S: * 1\. #] 0 * : 2 . *SU 13)'0 * (l; 7 ; 46) 1J0 * :32 . 4813>B2 0 7 >S: * )0 * D 0 7 >B: * )0 * 698 + #& . b'# 0 $" 2 7 = 7 ;62 #$A]& ;813C ); 4 2,: 2,> 7 ; ' 2)'494 * 0 7 462 $ " 2C;81 2) .8. * ; ' 2 U 13)0 *)>* > $*& 0 * :?>B2 C )(1 1 .97 ;62( * :3:-; * . C * ;81 H* 0@46) [] 6 & 13:?0 7 * ;8)(1 /+* # % #/( * >B; * . > * C1 >7 ;625C13("2 D* 0@4 * ( * :J: 2L( * 0 . 1J4 >2 25:W>S; * . > * ; * ( * :C"2';62 H* 46;8) (l; 1 C"254848) & . )C;825484 7 4848) C * ; >S):3:J1 . 1J)01

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]$ . 4 7 (13)-( * :3: 2,(1 . 48;81 7 U 1J)0 * ( * 1 ( m7%B %9m *'+( % 0 * :?C132'0)46;82 . ''* ; . ) bW$ >B)0@46;9):3:J) ( * 1;81 .97 :J4625461 ( * :> 2':J>B):J) 250"2':31A461J>B)T;81J= 7 2';9() :32 ( * 0 . 1J4 >2 ( * 1 /+* #&g

% #

#$ ( * 4 * ; 1302 U 1J)0 * ( * :3:32 (1 . C * ; . 13)'0 * ( * :3: 2 ' 25;81 2 13: * ;91 . C * 4846),2': ' 2':J); * (1J) - $N : C;8)=;82 ) 2 7 4613:J1 USU 2548) C * ; . 1 7 : 25; * >S):3:J1 . 1J)01 0 7 >B: * )5D 0 7 >B: * ) * C;8)'48)0 * D 0 7 >B: * ) >*& > $* 1 2C"25;94 * ( * : C2'>B> $* 4848) (1 . 1 7 : 2 U 13)'01 . ' 1J: 7 CC2546)2':J:; 7 01 ''* ; . 1J4 >2(1" 7 0( * 46;82548462 1J: C;8) > * .9. )1J0 )W() >B) C: * 48)V ("2':3:32 >S):3:J1 . 13)0 * 25:3: 2 C;9)W( 7 U 1J)0 * ( * =:J125(;8)01M0 * :3:J) . 4 2548) 7 0"2': * $ " 2HC"2'; 4 * > $*6$ ) 7. 2548) >*! 7 * :3: 2> $* = * 0 * ;82K: 2>B):J:31 . 13)'0 * V:-;%25CC;8) >B>S13) >* . ) . 4 250 U 132': * 0@4 * = * ) * 48;813>S) * ( >* 2 . 246) .87 : )W( * :3:J)(1 : 2 7 O* ; $" 2 . 1 7 :32 U 1J)0 * ( * :3:32,>B):J:31 . 13)0 * C;9)W> * ( * . * >B)0()K1 . * = 7 * 0@461 C"2 .9. 1 V

]$ = * 0 * ;62 U 13)0 * ( * :<C2';62 * 48;8),(<;I1 C"24846) ^ . * >B)0() 7 0"2(1 . 46;81 7 U 13)0 *H% % ^! ^ d 4

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y (fm)

z (f

m)

partecipantispettatorib = 7 fm

-10

-8

-6

-4

-2

0

2

4

6

8

10

-10 -5 0 5 10 15

13= 7 ;62 #$A] b V ( # '# ( % >,2<?> 2 *+( % ( # ( )# 6 1 , # ' % # % ( ' ' ( '# ' /: )# # # % ( ( # S #&% % *& % +( 2 ' hS # (

bW$ = * 0 * ;62 U 13)'0 * ( * 1Z0 7 >B: * 1 * ; . 2'=':313) * C;9)1 * 48461J: * >B)0 0 7 >S: * )01ZC 7 0@461 1 )'; 1 * (1AD. 48;81 7 1J481 . * >B)0()K:32,(1 . 46;81 7 U 13)0 * (1 [ ) ) (WD Q 2iU)'0 #$ > 2':J>B):J) ( * :G0 7 * ;9)(1 >B):J:31 . 13)01"130 * : 2 . 4613> $* 0 7 >S: * )'0 * D 0 7 >B: * )0 * V '* 0=)0)>S)0WD. 1J( * ;8254 * 4 7 494 * : * >B)'CC1 * 0 7 >B: * )0 * D 0 7 >S: * )0 * * : 2 C;9) 2 13:31A4 >2 (1 >S):3:J1 . 1J)0 *>*C * . 25462("2':3:32 . *SU 13)'0 * (l; 7 ;946)130 * : 2 . 461J> 20 7 >S: * )0 * D 0 7 >B: * )0 * 4$ > 2':J>B):J),( * : 0 7 * ;9)-(1 /+* # % # $

Z) H* 13: ) ( * :J:3) (1 : 2 7 * ; & 13:/C;9)=;82 3 2 0)0 461 * 0 * >B)0@46) ( * : + ' * #&% S $`NC"2';62 H* 46;81G> $* . 1?C ) .8. )0)130 . * ;81J; * 0 * :?C;8)'=;62 ) 2 . )0)V C"2';82 H* 46;91G( * :3: * (1 . 48;81 7 U 1J)0 * (1 [ ) )W( D Q 2VUW)0T( * :?C;8)'1 * 49461J: *L* ( * : O* ; . 2'=:31J) 130@4 * ; ' 2':J:3),(1 ' 2';91 2 U 13)0 * ( * : C2';62 * 48;8)(l; 1 C"254946) . *SU 13)'0 * (l; 7 ;946)-1J0 * :32 . 4813> 2,0 7 >S: * )0 * D 0 7 >B: * )0 * $

M* ;L: 2 [ )W) (WD Q 2VUW)0 * : 2 . *BU 13)0 * (<; 7 ; 46) $ ) 7. 2548) =:J1 . 4 * .9. 1 ' 2':J);81 1 C ) . 4625461 C * ; 1J:> 2':J>B):J)K2'02':31A4613>S) $"N : C;81 )-4 * . 4 1 254946) >S)0 13: C;9)=;62 3 2 )'0 4 * 2';9:3) >* : 2 ''* ;91 7 >B2 ! "#$$$%'&% )(*$+%-,/.102435'376089#5.+2;:<.=359?>

d@c

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0

100

200

300

400

500

600

320 340 360 380 400 420NW

Num

ero

di e

vent

i

b=2 fm (a)

b (fm)<N

W>

Calcolo analiticoMonte Carlo

(b)

0

50

100

150

200

250

300

350

400

0 5 10 15 20

13= 7 ;82 #W$J]# V# ' # 2 m # ( % # /+* # % # )# +* # # ; *+( # '# ( % # ^+ b 1 *+( %' (- ( ' ( # # ' m ( ,S mD'+'# % ( ./0 *+( % +( % ( # * *+( ( % # # *+( ; '# m ;- # ( % )# + J^ ./230

> $*H* .8. ) ;81JC;8) ( 7 >B2 1 ;81 .97 :J4625461M( * : >B2':3>S):3)T250"2':31A461J>B) C * ; ! 7 2'0@48) ;913= 7 25;8("2 : 2 (1 . 48;81ED 7 U 1J)0 * ( * : 0 7 H* ;8) H* (13) (1 +* # % #L130 1 7 0 U 13)'0 * ( * : C2';62 * 48;8) (l; 1 C"254946) $] 4 2': * . >B)C ) $ )H= * 0 * ;6246) ( * 1M>B2 C13)01 (1 >S):3:J1 . 13)01<2HC"2';82 * 46;9)K(l; 1 C"254946) 7 .8. 2D48) $ M* ; )='01 > 2 C1J)0 * : 2 (1 . 46;91 7 U 13)'0 * ( * :`0 7 * ;8) (1 /+* # % # >* >B)0 )'48481 225CC;8) .8. 1 2 U 13)'0 * =@2 7.9. 132'0"2 7 = $ #$J] # 2 : 2 7 = 7 ;82 #$J] # q ) . 46;62 1 C 7 0 481 J^ X . ) ' ;82'CC ) . 481 2':J: 2H> 7 ; ' 2 ("24 2K("25: > 25:3>B)':3) 250"2':31A461J>B) $ Z) * . 1 '* ( * & :32K>B) C"2461 13:31A4 >2>*D ):J48) 7 )'0"2 $ 7 494 * : * 130 1 ); 2 U 1J)01 .97 :3:32H= * ) * 46;91 2( * :J: 2->B):J:31 . 13)0 * C ) .9. )0) * .8. * ; * ;913>B2 ' 254 * (2':C;8)=;82 ) 2 $ " 2C;8)1 *BU 1J)0 * .97 :RC1 2'0)48;62 . '* ; . ) ( * :J: 2 (1 . 46;91 7 U 13)'0 * ( * 1 0 7 >S: * )01"C * ;7 0 * '* 0@48)H461JC13>S) >* ;813C ); 4 25462,130 7 = 7 ;82 #$J]bW$N : C"2 .9. ) .97 >B> * .8. 1 ' ) C * ; . 4 7 (1 2'; * :32 (1 . 48;81 7 U 1J)0 * ( * 1 ( m7%B %9m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c & Z%c 1 ` * > 25:3>B)': 2'0() 13:`0 7 * ;8) (1 /+* # % # C * ;,)='01Z> * :3:32 7 = $R#$A] 4 $ dd

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-10

-8

-6

-4

-2

0

2

4

6

8

10

-10 -5 0 5 10 15

y (fm)

z (f

m)

(a)

(b)

b = 3 fm

0

0.5

1

1.5

2

2.5

3

3.5

4

z (fm)y (fm)

ρ Wi (

fm-2

)

-10 -8 -6 -4 -2 0 2 4 6 8 10

-10

-5

0

5

10

0

0.5

1

1.5

2

2.5

3

3.5

4

13= 7 ;62 #$J] 4 V (- ( '# # ( % )# *+( # '# ( % # ./0 S *+( ; )# ' # 2 m # ( % )# %!'# ! ( * ' % # % ( ' ' ( ./230

d 6

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] ! 7 * . 46) C 7 0@46) >* C ) .8. 1 1J: * * # * 484 7 2'; * 13:/>S)0@46;8)':3:3) ( * : > 2':J>B):J) 2'0"2':J1J461J>B) ( * :3:32( * 0 . 1J4 >2 * (1 2,254946;82 ''* ; . ) 7 0"2,(1 . >S; * 461 USU 2 U 13)0 * ( * =':31 130@4 * =;62':J1O> $* >B) C"2'1J)0)0 * :3:32 #$I# c 1J0 1 2548481 7 0"2K1J0 4 * =;82 U 1J)0 * .87 :J:; * : ** 0@46)H130 7 01J4 * . 1 )-(1M2'; * 2 % 8(1 '* 0@462 7 0"2. ) ) 2548);8132 .87 :3: * > * :J: * ( * : ; * 4813>S):3)V

) *' + % 8 . ) *' X 8 0 ` % 8 ) ?' X 8 4 j A . ) A 0 `

A ) A X #$%# d () ''* ) A + % C C C C C !"#"$%5C 4 !hC& & Z b c 1 ` $- ; CO) .8. 1 13: * >S)0 1 ;9)0@4 2'; * 2'0> $* 1 ' 25:3);91 ( * :3:32 %!'# "! ( * ' : '+'# : 0 * :OC1 2'0) 46;82D. '* ; . ) 1J0 1 7 0 U 1J)0 * ( * : C"2';82 H* 46;9) (l; 1 C"254946) $ N : ' 2':J); * 2'02':31A4613>S) . 1 )'48481 * 0 * ("2':3:32 #$I## />B)0 8 + ' b 1J: ' 2':J); * )0@4 * 2';9:3) >* 7 = 7 2': * 25: ) A C * ; : 2H> * :J: 27[ > * 0@48;62': * \( * :?=;82 7 >B) #$A] 4 $N =;82 7 >S1<130 7 = 7 ;62 #W$J] c ) . 46;82'0)> $* >; >* 7 0 7 )0T2'>S>B);9()46;62 13:G>B2':3>S):3)2'0"2':J1J4813>B) *:32 . 1 7 : 2 U 13)0 * )0@4 * 2';9:3) $

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

0 5 10 15 20b (fm)

<ρW

> (f

m-2

)

(a)

Calcolo analiticoMonte Carlo

b (fm)

ρ Wm

ax (

fm-2

)

(b)

Calcolo analiticoMonte Carlo

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

0 5 10 15 20

13= 7 ;82 #$J] c V ( % ( % (: M* *+( (: % # # *+( * *+( (('/( % / ( ; %!'# ! )# ./0 ; %!'# !:: '+'# :1./230

) = 294J698:E;J<= 29: A = B ; 4JCD:RA = 6F;G: C@L > 4 8C = I = 29:fC@4J6F; BG= IR:E;J<= AH4 B+*-,.0/T 0"2 ' )':J4 2 '* ;81 7 > 25462,: 2 >S)0 . 1 . 4 * 0 U 246;821G;91 .87 :J4 2461 2'0"2':J1J4813>B1 *]! 7 * :J:31 ( * :J: 2 . 1 7 : 2 U 13)5D0 * C * ; ! 7 250 48)H;913= 7 2';8("2 : 2,( * 0 . 1A4 >2 &l>* C ) .8. 1 1J: * 2'CC:J13> 25; * :32,0 7 ) ' 2 ' 2';8132 1J: * 251G("25481

d P

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. C * ;81 H* 0@4 2':J1 & 7 4613:J1 USU 2'0() 1J: )0@4 * 2';8:J)C * ; 1J0 48;8) ( 7 ;9; * : * (1 . C * ; . 13)01 . C * ;81 H* 0 462D:31 & > $* 13:">B2':3>S):3) 2'0"25:31J4813>S) 0)0 ( >2 $ * ;Z2 ''* ; * : 2( * 0 . 1J4 >2 * (132 (1 +* # % #`>B) H*. > 25: 2 (1"> * 0@46;625:31J4 >2 &>* 0 * > * .9. 2';913) > 2':J>B):32'; * 1J: ' 2':3)'; H* (13)(1 ) - 0 * :3: *#! 7 254848;8) >B: 2 . D. 1/(1 > * 0@46;625:31J4 >2 $ N : * 48)W() . * = 7 1A46) >* ( * ;91 ' 2546) (1J; * 484 2 H* 0 4 * ("2 ! 7 * :3:J) 7. 2548) C * ;13: 0 7 H* ;8) (1 +* # % # $<N :31 1A461?( * :3: * >B:32 .8. 1 . )'0) 7 .8. 25461 254848;62 '* ; . )T:32 ' 25;81 2 13: * ):A4 * C:31J>B1J4 >2 * 1J: 7 4 .97 :3:J) . C * 4946;9) (1 ):A4 * C:31J>B1J4 >2 1 );801 . > * : 2 >B) . 4 250 4 * (1C;9)CO)'; DU 13)'0"2':31A4 >2 46;82-0 7 * ;9)H(1?C"2';94813> * :3: * >B2';81J> $** 0 7 * ;9)-(1 /+* # % # $N : * 48)W() >*(1<461JCO) )'0 4 * 2';8:J) * . 1 . ' 13: 7 CC"20 * : ) () . * = 7 * 0 4 * V

= * 0 * ;62 U 13)'0 * ( * :GC2';62 * 48;8) (l; 1 C"254848)^ . * >B)0(),: 2 (1 . 46;91 7 U 13)0 *H% % ^ ^ >B)0@48;8):J:3) ( * : ''* ;91 7 >B2'; . 1 (1Z>S):3:J1 . 13)0 * 1J0 * :32 . 4813> 2 254848;62 '* ; . ) : 2 C;9) 2 13:31A4 >2T(1>B):J:31 . 13)'0 * #$A] b > 2':J>B):J) . * >B)0()K1J: ) ( * :3:3)(1 : 2 7 * ;/(1 V

]$ 0 7 * ;8) * (1J)(1 /+* # % # J^ bW$ ( * 0 . 1A4 >2 H* (1 2,(1 +* # % # ) *^ ' #&% S ( * :?0 7 * ;9)H(1 +* # % # V2 132 ) ' 1 . 48) 7 = 7 ;82 #W$J]# 2 Z> $* & C * ;^ 7 .9. 2548) & :32 (1 . 46;81 7 U 13)0 * ( * :R0 7 H* ;8) (1 /+* # % # >* =@2 7.8. 132'0"2 $ * ;4 * 0 * ; *

b (fm)

σ NW

0

2

4

6

8

10

12

14

16

18

20

0 2 4 6 8 10 12 14 16 18

13= 7 ;62 #$J] d V * ( ( m # *+(1 )# ( ; )# ' # 2 m # ( % )# #&% mJ% # ( % ( # (

d

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>B)0@46) (1 ! 7 * . 46) & 25: ' 25:3); * > 2':J>B):32546) + J^ ' 1 * 0 * 2'==1 7 0@46) 7 0) . > 2'; 46) > 2 .97 2D: ** . 46;8254848) ("2 7 02 (1 . 48;81 7 U 1J)0 * 0); 25: * >S)0 ( *' 1 2 U 13)'0 * . 4 250("2';9( 6 *^ $" 2-> 7 ; ' 2 6 *^ & 130 7 = 7 ;62 #$A] d &8>* )'484 * 0 7 462C * ; C 7 0@481M2-C"2'; 461J; * ("2':J: * (1 . 48;81ED 7 U 1J)01R2 ^ 7 .8. 2546) = * 0 * ;6254 * >S)0 1 ' 2':3);91C * ;1"C 7 0@461 130@4 * ; * (1 . )0);813>B2 ' 2461 C * ; 1J0@4 * ;9CO)': 2 U 13)0 * $RN : 0 7 ) ' ) ' 25:3); * C * ; 13:M0 7 H* ;8) (1 +* # % # >*130(1J> 2548)>B)0 *^

' #&% S ( * :3:32 ( * 0 . 1A4 >2V ' 1 * 0 * 13C )'481 UBU 254 2 >B);9; * :32 U 1J)0 * 48)'4 25: * 48;62 : * (1 . 48;81ED 7 U 1J)01 ( * :3: *6' 25;81 2 13:J1 * ) - >S1 >) *! 7 1 ' 2': * 2T>B)0 . 13( * ;625; * >B) . 4 2'0@4 * 1J:' 25:3); * ( * :3:;I2'; * 2 (1 . ) ' ;62'CC ) . 1 U 1J)0 * ( * 1 ( 7 * 0 7 >S: * 1 C * ; >B)':3:31 . 1J)01 2 ^ 7 .9. 2548) * : 2 C;8)'C"2'=@2 U 13)0 * (1J; * 484 2 ( * :J:3) ' #&% S ( * : 0 7 * ;9) (1 /+* # % #2':3:32( * 0 . 1J4 >2( >2WV ) *^ + ) *^ J^ *^ #$%# 6

> 2':J>B):J)( * :?0 7 * ;9)H(1GC"2';94813> * :3: * > 25;813> $* + J^ 130(1 ' 13( 7 2 U 13)'0 * ( * :3: 2,>S: 2 .9. * (1?> * 0@46;82':31A4 >22> 7 1 25CC"2'; 461 * 0 * :; *''* 0@46) 254848;81 7 U 1J)0 * ( * : ' 25:3); * ) J^ 25:3: 2 >B: 2 .8. * 48;8) ' 254 2 $

Z)'0 : 2 . 1 7 : 2 U 13)'0 * (1 7 0 13:J13)0 * (1 *'* 0@461 . 1R)'484 * 0=)'0): * (1 . 48;81 7 U 1J)01"(1R( * 0 . 1A4 >2* (1 2,(1 +* # % # 0 * :3: *Y! 7 254848;8)>B:32 .8. 1<;81JCO); 4 254 * 130 7 = 7 ;62 #$A] 6W$N 0 4 2 * :J: 2 >* ;81JCO); 4 2548) 13: ' 2':J); H* (13) (1 ) H 0 * :3: *! 7 24846;9) >S: 2 .9. 1 >B)'0 :; * ;9;8); *. 1 . 4 * 254813>B) & . 461 2548) 1J0 2 . * 25:3: * >B)';8; *SU 1J)01`CO)';94 24 * 25:3:3) . C * 4846;9) . C * ;91 * 0@4 25: * (1 ):A4 * C:313>S1J4 >2 & (1 > 7 1M(1J; >)H0 * : > 2'C1J46)':3) 4 & ( * (1J> 2548) 2':J:;I2'0"2':J1 . 1O( * :J: 2 )':J4 * C:31J>B1A4 >2,C * ;:-; * . C * ;91 * 0@46) ] c 6 $ " ; * ;8;9); * . 4 2461 . 461J>B) * ;9;8); * ( * :J: 2 H* (1 2 >* 48;62 . > 7 ;82546) & ("2548) > $*>* 1J0 1 * ;913); * (1 7 0 );8(130 * (1?=';62'0( *BUBU 2H2 ! 7 * :3:3) . 1 . 4 * 25461J>B) $

6'&

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43

2

1

<ρW> (fm-2)

num

ero

di e

vent

i

0

500

1000

1500

2000

2500

0 0.5 1 1.5 2 2.5 3 3.5

13= 7 ;62 #$A] 6 V # ' # 2 m # ( % #,)# ) % '*; '+'#,)# *& % # "! )#

! #"$%'&( )+*-,.,/)102,3*-,5476) )+*84/9.:;02,3*-,)3(: )+*<6>=.?;02,3*-,,.=4 )+*-9.:@(A02,3*-,,/)

6W]

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9 1 Z) H* ( * 4848) 1J0 ]$ b $ 4 & =:31 * . C * ;91 * 0@461>B)0=:31W13)01C * . 250 481 7. 2'0) 1"(25461; * :325461 ' 12 >B):ED:J1 . 13)01?C;8)'48)0 * D 0 7 >B: * )K>S) * ;81 1 * ;91 * 0@46) 8>*&+! 7 1J0(1 & 0 * > * .8. 2';81J) )'484 * 0 * ; * 7 0"2 . 481 2( * : ' 25:3); * ( * :3:32( * 0 . 1A4 >2K( * 1 +* # % # C * ; 1 . 1 . 4 * 1 C;8)546)0 * D C1J) ) * C;8)546)0 * D * ;913:J:313) & 7 4613:J1 USU 25481G130[ ] 6W$N : > 2 . )(1O1J0 4 * ;82 U 1J)01"130> 7 1O1J:"C;8)1 * 494613: *?>* 7 0HC;8)546)0 * . 1RC; * . * 0@4 2 & >B)0 1R0) . 46;91 . 46; 7 D* 0@481 & ):J48) C1 >7 >S) C: * .9. ) * (1 >S13: * ("248;625494 2'; * ( * :">B2 . ) 0 7 >B: * )5D 0 7 >B: * ) &' 1 . 46)> $*0 * : ) ( * :J:3)(1 :32 7 * ;1R0 7 >B: * )01 . )0) >B)0 . 13( * ;62461 C 7 0@461 1 ); 1 >B1J) >* (1O(1 * 0 . 13)01 ):A46) 130)';81 (1 ! 7 * :J: * ( * :3:; 130@4 * ;8)K0 7 >B: * ) 8! 7 * . 462 1JCO)'4 * . 1 >*6'* ;81 7 > 25462 1J0 2'01 * ;82 130); * C * ; 0 7 >S: * 1?C13>B>S):31 * & 130 C2';94813>B)': 2'; * & 0 * :?> 2 . )(1?C;8)546)0 * D 0 7 >S: * ) $N : C;9) : * 2 C;9130>S13C"2': *>* :-;%2 .9. * =0"2 U 13)0 * (1 7 0"2 (1 . 46;91 7 U 13)0 * (1 ( * 0 . 1A4 >2 ( * : C;8)546)0 *&250"2':3)'=@2,2 ! 7 * :J: 2,> $*J>* : 2,(1 . 48;81 7 U 1J)0 * (1 [ ) ) (WD Q 2iU)'0 C * ;/1<0 7 >B: * 1 & 7 461J:31 UBU 24 20 * :1 )'; 2':31 . )K( * : ) ( * :J:3) (1 : 2 7 O* ; C * ;13: >B2':3>S):3)T( * :3: * 1 7 0 U 1J)01 (1 . C * .8. )'; * > 1 ; $*! $ #$ d $N : C;9) : * 2 ;81 .87 :A4 2 130C2';94 * . * C:31 7 > 2548) . * . 1 ( *7 01 . > * :32 1 7 0 U 13)'0 * (1 . C * .9. ); * / 130 ) () (1J; * 4946) & >B1J) >* . * 0 U 2 C"2 .8. 25; * 254946;62 ''* ; . ) 7 0"2 (1 . 46;91 7 U 13)0 * (1W( * 0 . 1J4 >2 & 2 2 .8.97 D* 0() :32 1 7 0 U 1J)0 * (1 . C * .8. )'; * ( * :@0 7 >B: * )0 * 7 = 7 2': * 2 7 0"2 (1 C& b D (1 * 0 . 13)'0"2': * ! 7 * . 46) *! 7 1 ' 2': * 2->S)0 . 13( * ;62'; * 1J:<0 7 >B: * )0 * >S) * 7 0"2-C"2';94813> * :3:32C 7 0@481 1 ); H* V

/ 8 + 8 Z #$%#'P ] C2';62 * 48;8) (<;I1 C"24846)^ & : 2K( * 0 . 1A4 >2 :J)W>B2': * (1 +* # % # & 0 * : C 7 0@46)T( * : C132'0)48;62 . '* ; . )1J0(1 ' 1J( 7 2548)("2': '* 4846)'; * 8 & . 1O)548461 * 0 * ("2':J: 2 #W$%## >S)0 = + ] * /1:@+./ + V

) *' X 8 ,+ *' 4 8 b 698 - /10 8 < ]54 . ]4k698 / 0 R8 0 0 e Z #$%# ) . 48)V

0 R8 + 698 - / 0 8 < ]4 . ]54k698 / 0 8 0 0 X #$ 4& 1J:<0 7 * ;8)-(1 +* # % # >* V ?' + % 8 *' 4 8 0 R8 ,+ 0 *' ,++ 698 - /10 *' < ]4 . ]4k698 /10 *' 0 0 Z #$ 4] * ; >S):3:J1 . 1J)01 C;8)'48)0 * D 0 7 >B: * ) & 13: 0 7 * ;8) (1 C"2'; 4 * >B13C2'0@461 >* 7 = 7 2': * 25:L0 7 * ;8) (1>S):3:J1 . 13)01 1J0 * :32 . 4813> * 0 7 >S: * )0 * D 0 7 >B: * )0 * 2 > 7 1 ' 2 2'==1 7 0@46) 7 0)TC * ; >S)0@4 2'; * 2'0> *

6b

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13:ZC;8)'48)0 * 130>S13( * 0@4 * $ ) 7 130(1 '* ;91 7 >B2546) . * 7 * . 46) ;81 .87 :A4 2548) >* ;81J48;8) ' 2546) >B)0 : 22'CC;9) .8. 1 2 U 1J)0 * 1J0 48;8) ()'494 2 C;9)'46)'0 * C 7 0@461 1 ); * $<N : 0 7 * ;8) (1 >S):3:J1 . 1J)01 >* ("2546)("2':3:32 #W$J] c * C * ; 1J:G> 2 . )C;8)'48)0 * D 0 7 >B: * ) . 1 "2WV+ GMPM *' + 698 - % 8/10 8 *' 4 8 ,+ 698 - / 0 *' #$ 4 b : 2,(1 # * ; * 0 U 2V + ?' 4 + GMPM *' + ]4 . ]47698 / 0 *' 0 0 + ]4E8 ?' #$ 4@# >* 7 = 7 2': * 2':J: 2 C;8) 2 13:J1J4 >2(1@2 '* ; * 2': * 0) 7 0"2/>S):3:J1 . 1J)0 * 130 * : 2 . 461J> 2Z0 7 >S: * )'0 * D 0 7 >B: * )0 * E8 *' & ("25462 ("2':3:32 #W$J] b >* :32 C;8) 2 13:J1J4 >2 (1R2 '* ; * & >B):J:31 . 13)01W1J0 * :32 . 4813> * 0 7 >S: * )'0 * D0 7 >B: * )0 * & 7 1J0(1 ' 2': * . * C; * ] 1J: C;8)'48)0 * 7 2'0() >; >* >B):J:31 . 13)0 * $ Q 1>B)0>B: 7 ( * &C * ;8>B1 >) & > * :-;%2'CC;8) .9. 1 2 U 13)0 * 1 25484620)0TCO)';94 2>S)0@46;625((1 U 13)01<130@4 * ;80 * 2': ) ( * :J:3) $" 2( * 0 . 1A4 >2 * (1 2,(1 +* # % # >* ("254 2("25:3:; * . C; * .8. 13)0 * V

) *' + % 8 i` *' 4 8 `0 8 0 *' Z #$ 4 4 " 2 C; * . * 0 U 2( * :O4 * ; 1J0 * `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

/ 8 C * ; 8 698 & C * ; 8 Y 698 X #$ 4 c () '* :32$ 0 >* 4 25: * > * / . 1 2L0); 2':31 UBU 254 2 2':3:-; 7 01J4 >2 $ N 0 7 * . 46) )W() : 2 1 7 0 U 1J)5D0 * (1 . C * .8. ); * ( * :GC;8)'48)0 *6>* 2 .8.87 0 462 7 = 7 25: * 2 7 0 >B1J:3130(;8) (1<25; * 2,C2';81O2':3:32 . *BU 13)0 *(l; 7 ;946) 130 * : 2 . 4613>B2 0 7 >S: * )'0 * D 0 7 >B: * )0 * 698 + #& l& > *>* 130@4 * ;8C; * 46254 2 >B) * [825; * 2* > 2'> * \H( * :?C;9)'46)'0 * 2': 7 0 * ( * :3:-;I1J0 4 * ;82 U 1J)0 * >S)0 1G0 7 >B: * )01?( * :?0 7 >B: * ) O* ; . 25=:31J) $" 2H:313> * 1A4 >2H(1 7 * . 4 2 2 .8.97 0 U 13)0 * C 7 >) * .9. * ; *5'* ;91 7 >B254 2 24846;82 '* ; . )T13: > 25:3>B)':3)K( * : 0 7 D * ;8) ( * 1 0 7 >B: * )01 +* # % # & > * C 7 >) * .8. * ; *K* # * 494 7 246)T130 )W() 0 7 * ;913>S) . 1 27. 2'0()H:32 * $ #$ 4] Z> * 7. 2'0(): 2/ * $ #W$ b c $N :C;8)=;82 2 C * ; * 494 * (1 . 1 7 : 2'; * 2'0> * >B):J:31 . 13)'01 C;9)'46)'0 * D 0 7 >B: * ) : 2C;8) 2 13:J1J4 >2L(1R>B):J:31 . 13)'0 * 48;6213:C;9)'46)'0 * 1J0>B1J( * 0@4 * * 1"0 7 >B: * )01 ( * : O* ; . 2'=:31J) >* C * . 254 2254848;62 '* ; . ) : 2 . *SU 13)'0 * (<; 7 ; 46) 698$?N =;62 7 >B1`130 7 = 7 ;62 #$J] P C; * . * 0@4 2'0) 1`;81 .97 :J4625461 ( * :6'#

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0

1

2

3

4

5

6

7

8

0 2 4 6 8 10 12b (fm)

<NW

>

Tp=δTp=Tp’

Monte Carlo

(a)p+Pb

b (fm)

<NW

>

Tp=δTp=Tp’Monte Carlo

(b)p+Be

0

0.5

1

1.5

2

2.5

0 1 2 3 4 5

13= 7 ;82 #$J] P V *+( ( %9m ( )# ( )# /+* # % # #&% m7% # ( % % ( # ($ =<?>,2 ./0 =<:./230

>B2':3>S):3) 0 7 * ;913>S) * . * = 7 1J46) >S)0 : * ( 7 * 1 7 0 U 13)'01 (1 . C * .8. ); * * ( * :3: 2 . 1 7 : 2 U 13)0 * )0@4 * 2';8:J)C * ; C < * C < _Z* $ * :<>B2 . )(1G>B)':3:31 . 1J)0 * C;8)546)0 * D C1J) )1J:O;91 .87 :J4 246) >* :3) . 4 * .9. )>B)0 1O( 7 * 4813C1O(1 1 7 0WD

654

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U 13)'0 * (1 . C * .8. ); * ( * :<C;9)'46)'0 * : * ( 7 * > 7 ; '* ?' >B)1J0>B1J()0) * :32 . 1 ,7 : 2 U 13)'0 * ) . 46;82,)'48481 2,>B) C"25481 1J:31J4 >2 >S)0 13:G>B2':3>S):3)0 7 * ;913>S) $M* ;ZC;8)'48)0 * D * ;81J:3:J13) & 1J0 '* > * & . 1 "2 7 0"2,(1 . >B; * C"250 U 248;62: * ( 7 * > 7 ; '* * 1 C 7 0@461O)'484 * D0 7 461 ("2': )0@4 * 2';8:J) . 1 (1 . C )0=)0) .97 :3:32 > 7 ; ' 2; * : 25481 ' 22':3:-;%2 .8.87 0 U 1J)0 * (1 7 0"2 (1 C `>S) * 1 7 0 U 13)'0 * (1 . C * .9. ); * ( * :WC;9)'46)'0 * $ " ;I);913=1J0 * ( * : (1 . 2'>S>B);9() . 462 0 * : 1 254946)> * : 2 1 7 0 U 13)'0 * (1 . C * .8. )'; * ( * :<0 7 >S: * )(1 O* ;81J:3:31J) ^0 7 * ;8)-(1 2 .9. 2\]+ >* ):A46)C1 >7 . 48; * 484 2(1 7 * :3:32-( * :?0 7 >B: * )-(1?C1J) ) R]a+ b5&P V130 7 = 7 ;62 #$J] . )0)-;81JCO)';94 24 *: * ( 7 * 1 7 0 U 1J)01M(1 . C * .9. ); *-* : 2 1 7 0 U 13)0 * (1 . C * .8. )'; * [82 >B1J:3130(;8) \H( * : C;8)'48)0 * $ Q 1'* ( * >1 2';82 * 0@4 * > * & 2,C"2';82 * 46;9),(l; 1 C"254946)C;8) .9. 1 )2 US* ;8) & * 0@46; * C * ; C < : 2 1 7 0 U 13)0 * (1 . C * .8. )'; * ( * : C13) ) >* >B1J;8> 2>B) . 4 250 4 *L* 0 48;8) 13:>S13:31J0(;9) (1 2 . * 7 = 7 25: *2 #'& l& C * ;`C < _Z* : 2 1 7 0 U 13)'0 * (1 . C * .9. ); * ( * : * ;81J:3:J13)L1J01 U 1 2 2 ( * >B; * . > * ; * =1 >2 * 0@46;9)13:">B1J:31J0(;8)> * ;62'CC; * . * 0@46213:RC;9)'46)0 * V 0 * ( * ;91 ' 2 7 02 (1 1J0 7 U 13)'0 * ( * :J: 2C;8) 2 1J:31J4 >2(1 >B)':3:31 . 1J)0 * * & (1 >B)0 . * = 7 * 0 U 2 & ( * : 0 7 * ;9)T(1 ( mJ%B %9m *'+( % & ;81 . C * 4946)T2': >B2 . )130 > 7 1 . 1 7. 1 7 0"2 (1 C& $ 7 * . 46) >* 13: )'481 ' )( * :J: 2 . )'4848) . 481 2(1 1J0 C < _Z* & 7 2'0() . 1 7. 2:32 1 7 0 U 13)0 * (1 . C * .8. ); * [82>B1J:3130(;8) \ / $

s (fm)

funz

ione

di s

pess

ore

p Be Pb

√σ0/π____0

0.2

0.4

0.6

0.8

1

0 2 4 6 8 10

13= 7 ;62 #$A] V1mJ% # ( % #)# ' '+' (+ )# %9m *' #)# >,2) )# . # ' * ;/ m7% SJ( '+' '\( )#&% /0 *+( % ( % (*+( % ; mJ% # ( % )# ' '+' (+ * # #&%B ( ( ( %

N ;91 .87 :J4 2461<(1 7 * . 481 > 2':J>B):J1GC ) .8. )0) * .8. * ; * >B) . > n . 1J0@4 * 481 USU 25481 V C * ; 13: > 25:3>B)':3),( * :G0 7 * ;9)(1 /+* # % # & 7 0"2 7 )0"2-2'CC;9) .8. 1 2 U 1J)0 * ( * :J: 21 7 0 U 13)0 * (1 . C * .9. ); * ( * :C;8)'48)0 *Y>* 7 0"2 (1 C&Z0 * :C132'0) * .9. 2( >2 ;81 .87 :A4 25481130T2'>S>B);9()>B)0T13:GC;8)=';62 2 (1 . 1 ,7 :32 U 1J)0 * C * ; 7 2'0@48)H;913= 7 25;8("21J:<0 7 * ;8)

6 c

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(1 /+* # % # & . 132C * ;/C < > * C * ; C < _Z* 0)0 >* C ) .9. 1 13: * > 2':J>B):32'; * 1J0 ) () (1J; * 4946) : 2 ( * 0 . 1A4 >2 7 4813:31 UBU 2'0() 7 * . 4 22'CC;9) .8. 1 2 U 1J)0 * :;I2'CC;9) .8. 1 2 U 1J)0 * ( * :3:32 1 7 0 U 1J)0 * (1 . C * .9. ); * ( * :`C;8)546)0 * >S)0 7 0"2 1 7 0 U 1J)0 */ [82 >B1J:31J0(;8)\ & >B)0 13: ' 130>S):3) 7 . 13>S) > * :;I2'; * 2 (1 2 . * . 132 7 = 7 2': * 2':3:32 . * DU 13)'0 * (l; 7 ;948)H1J0 * :32 . 4813> 2 0 7 :3> * )0 * D 0 7 >B: * )0 * 698 & ( >2 7 02 . 461 2,(1 1J0 C < >B) C"25481 1J: * >S)0 7 * :3:32,)'484 * 0 7 462("25: )0@4 * 2';9:3) C * ; 7 2'0@46) ;913= 7 2';8("2-13: >B2 . ) C < _ *' 1 >* 7 0 (1 . 2'>B>S);8() & 1J0); * ( * : ]& & C * ;>B):J:31 . 13)01 > * 0@46;82':31 1 C 7 4 2 1J: * 25:3: * (1 * 0 . 13)01 )':J46) ;913()5484 * ( * :0 7 >B: * ) (1O* ;813:J:31J) $

" 2 7 = 7 ;62 #$%b'& C; * . * 0@4 2 : 2 ( * 0 . 1A4 >2 C * ;1 . 1 . 4 * 1 C;8)'48)0 * D 0 7 >B: * ) (1 130@4 * ; * .9. * C * ;[ ] 6 & . 461 25462 7 461J:31 USU 2'0(): 2C"2';82 * 46;91 USU 2 U 13)0 * / & 2'0> * . * >B1 >)-0)0 >* ( * :?4 7 4946). )W((1 . 1 2'> * 0 4 * C * ; 1J: >B2 . ) C;8)546)0 * D * ;913:3:J13) $ " ; ) .8. * ; ' 2 U 13)'0 * C1 >7 1 C );9462'0@4 * (2 1 2'; *>* > * : 2 ( * 0 . 1A4 >2T(1 +* # % # ;62'='=1 7 0= * 7 0 ' 25:3); * ):A46) * : *' 2548) C * ;>S):3:J1 . 1J)01> * 0@46;82':31 C;8)'48)0 * D C13) ) e b Z c %!1C 1 ` * ( >* 1J0 1 * ;913); * 2 7 * :3:32 (1C13) )5D C13) ) > * 0@48;62': * . ):3)( * : ] d & * 0@46; * : 2 (1 # * ; * 0 U 20 * :J: 2 . > 2':32 ( * :"0 7 * ;8)(1 +* # % # >*-* . 46; * 2 * 0@4 * C1 >7 * : * ' 254 2 P +* # % # C * ; C < * # & C * ; < l& 2X^+ & $ T 0<;%2':A46;82->S) . 2-> * . 1 ) .8. * ; ' 2 >* > * & . 132C * ; C;9)'46)0 * D C13) )> *C * ; C;9)'46)'0 * D O* ;813:J:31J) & 2C2';62 * 48;8)(l; 1 C"254946) ):J48),C1J>B>B)':3) & 13:<0 7 * ;9)(1 ( m7%B %9m *'+( %-C * ; 1 * ; 1 7 2'(;6246) >* >B1J;8> 2 7 = 7 25: * 2 7 04 * ; U )L( * : 0 7 * ;8)L48)'4 2': * (1 ( m7%B %9m *'+( % P' 1 . 46) > * . 1"2 698 + #'& + # 1 ` * > * 698 >* 2 .8.87 0 462 >B) * [82'; * 2* > 2'> * \ ( * :MC;8)'48)0 * 254848;62 '* ; . )K: 2 . > * :J462H( * :3: 2 1 7 0 U 13)0 * (1 . C * .8. )'; * / & . 1 "2H> * &C * ; >B):J:31 . 13)'01> * 0@46;625:31 & :32 ( * 0 . 1A4 >2 >* C;8)'CO); U 1J)0"2': * 25:O0 7 * ;9)(1 /+* # % # *4' 2': * V

) + -698 Z #$ 4 d

N =;62 7 >B1130 7 = 7 ;82 #$%bW] ) . 46;82'0) > * 13: ;82'CC );948) +- ) >* 7 = 7 25: * 2 #& 7 0)2 ^ e d 1 1J0 C < ^CO)'1 . 1 "2,:; * # * 4946)(1)# lmT' % '+'( * : );8()( * :<0 7 >S: * )(1C13) ) C * ;C;8)546)0 * D * ;913:3:J13)H=:31 * # * 48481`(1 )';8() . )'0) ):A46) C1 >7 2'>B> * 0@4 7 2461 & 2C * ;5^ e & 13:O;62'CCO); 46) ' 2': * #'& $

6 d

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b (fm)

< ρ W

> (

fm-2

)

p+Pb

p+Be

0

0.5

1

1.5

2

2.5

0 2 4 6 8 10 12

13= 7 ;62 #$ b5& V %!'# "! )# )# +* # % # % # % ( ' ' ( #&% *+( # '# ( % # +( ( % g %9m *'+(

0

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1

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ρ W>

(fm

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b (fm)

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6 6

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M* ;/> 2':J>B):32'; * 13: ' 2':3)'; * (1J),( * :J: 2 ( * 0 . 1J4 >2,130 C < * C < _Z*5>* 0 * > * .8. 25;813) ^>B) *. 2'; >2 >1 2';9) 0 * : . * = 7 1A46) . 4 7 (1 25; * :32 (1 . 48;81 7 U 1J)0 * ( * :W0 7 * ;8) (1W>B):J:31 . 13)'010 7 >B: * )0 * D0 7 >S: * )0 * 130 1J0@4 * ;82 U 1J)01O2,C"2';82 * 46;9),(l; 1 C"254848) 7 .9. 2548) $RQ 1 >* 1 2548462,:; 13C )'4 * . 1 > * 4 2': *(1 . 48;81 7 U 1J)0 * . * = 7 2 :32 . 4 25481 . 4613>B2 (1 )1 .9. )0 & >B1J) >* > * & . * C * ; 7 0 > * ; 46) ' 2':J); * ( * :C2';62 * 48;8)-(l; 1 C"254946)13:G0 7 * ;8) * (13)(1?>S):3:J1 . 13)01 >* GMPM & :32,C;8) 2 13:J1J4 >2> * 1307 0 . 130=)':3) *''* 0@46) ' 1 . 1 250) >B):J:31 . 13)'01 ' 25:3=@2V X + GMRM c+ ]

+ GMPM Z #$ 4 6

0

250

500

750

1000

1250

1500

1750

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b = 3 fm b = 5 fm

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7 * . 462L13C )'4 * . 1 >* . 4 24 2 ''* ;91 7 >B254 2 & 254946;62 ''* ; . ) 13:@C;8)=;82 2 (1 . 1 ,7 : 2 U 13)'0 * & = * 0 * ;82'0WD()> 2 C1J)01 (1G>S):3:J1 . 1J)01R2 ^ 7 .8. 2546) * >S)0 1 ;9)0@4 2'0(): * (1 . 48;81 7 U 1J)01 ( * :<0 7 * ;9)(1>B):J:31 . 13)01O>S)0 ( * :3: * (1 . 48;81 7 U 1J)01<(1 )1 .8. )'0 >B)'0 : 2 . 4 * .9. 2 * (1 2 > 1 ; $ 7 = 7 ;82 #W$ bb $N : * 46) () . * = 7 1A46) C * ;: 2 ( * 4 * ; 130"2 U 13)'0 * ( * :3: 2 ( * 0 . 1J4 >2 * (1 2 (1 +* # % # 130>B):J:31 . 13)01 #&% # m 2 # ' +2': * 0) b +* # % # >* ):J48) . 1 13: * 2 7 * :3:J) 7. 2546)C * ;/: * >B:32 .8. 1?(1 < V ' 1 * 0 * = * 0 * ;62548)13:C"2';62 * 46;8)(l; 1 C"254946) ^ & . 1 '* ;81 7 > 2 > * 2 '2'* 0=@2:32 >B):J:31 . 13)0 ** . )0)H>B2':3>S): 25481 V GMPM J^ X J^ X ) J^ $ ' 1 * 0 * 25CC:31J> 2548) 7 0)3' #&% S CO)'1 .8. )0132'0)-2':?0 7 * ;9)(1?>B):J:31 . 13)01O0 7 >S: * )'0 * D0 7 >B: * )0 * )'494 * 0 * 0() 7 0 0 7 * ;9) (1>B)':3:31 . 1J)01 GMRM 1J0@4 * ;9) * . 48;6254946) (2 7 0"2(1 . 46;91 7 U 13)0 * (1 )'1 .8. )0 >B)0 * (1 2 + GMPM J^ 13:O0 7 * ;8)(1 /+* # % # >* )'484 * 0 7 48)H>S) * + GMRM < ] : 2,( * 0 . 1A4 >2 >* > 2':J>B):3254 2,>S) * V

) + ) J^ GMRM < ] *^ Z #$ 4@P N : ' 25:3); * (13)( * :3: * (1 . 48;81 7 U 1J)01O>B) . > n )'484 * 0 7 46)C * ; C < * C < _Z*J>* V

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) ^ ^ K*LA KJLQA G ) ^ + & Z & c ^ ^ K*LA KJLA G ^ ZQ * 0 * ( * ( 7 > * > * 1 . 1 . 4 * 1<C;9)'46)0 * D C13) ) * C1J) )5D C13) ) . )0)->S)0 1 ;8)'0WD4 2 1J:31M("2':`C 7 0@46) (1 ' 1 . 4 2T( * :J: 2 ( * 0 . 1J4 >2 (1 +* # % # & * 0 48; * . )0) ):J48)(1$# * ; * 0 U 1 25481<C * ; 7 * :?> * ;81J= 7 ;8(2,:; * . 4 * 0 . 13)0 * . C"2 U 1 2': * ( * :J: 2 + 2& $

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4$ N 0 >B)0 . * = 7 * 0 U 2 (1 7 250 48) ( * 4848) 2': C 7 0@48) C; * > * 0( * 0@4 *& :J) . 4 7 (13)T(1 . 1 . 4 * 1130@4 * ; * (148;62 CWD * D C 7 >) ("2'; * 130 1 ); 2 U 1J)01 7 461J:31 .97 :3:32 U )0"2 ( * :J: 2/46;82'0WD. 1 U 13)'0 *`* & 130 C"2'; 4613>S): 25; * & C )'48; * O* >1 25;813; * 7 :J4 * ;81J); * 0@4 * 1J:@(1 ''* ; . ) . 13=01 7 >B2546)( * :J: * ( 7 * . > 25: * (1?> * 0@46;625:31J4 >2 . 4 7 (1 24 * $

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* ; . 2'=':313) 7 .8. )VP[] P c & >S)0 * ; . 2'=':313)-(1<4 7 0= . 4 * 0) +[ &"* [] 4 & >B)0 O* ; . 2'=:31J)(1 U ): 1 ) $ 246) > * : * 2 .9. * ( * 1 0 7 >S: * 1 7. 25481 . )0) 1J0);91 (1 7 * :J: 2 ( * :` 8 l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a[] P c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c * [ ] 4 13: 46;913== * ; * ;821 CO) . 4 2548),130 ) ()("2)C * ;625; * 7 0462'=:J13) 1J0> * 0@48;62':J1J4 >2L462': * > * :32 . *SU 13)'0 * (l; 7 ;946)(148;81J== * ; 6 LAKJL +2'CC * 0(13> * ] 1 ) .9. *>S13;9> 2 7 = 7 2': * 2': #& ( * :3:32 . *BU 13)0 * (l; 7 ;948),130 * : 2 . 461J> 2 6 A KJMR(1 Q < [ * Q < Q ;91 . C * 49461 ' 2 D * 0@4 * $ " 2 . *BU 13)0 * (l; 7 ;948) 130 * : 2 . 461J> 246;62( 7 * 0 7 >S: * 1 (1 0 7 * ;81 (1 2 .9. 2 ] *\_ * ;62>B2':3>S): 24 2,("2':J: 2; * :32 U 1J)0 * * C1J;813>B23. ## 0 V

6 0:A KQM + d P Z P *- ' < = ' 4 ] Z #@b ` Z #$ 4 Q * . 146;82 . > 7 ;6250)=:31 * # * 48481"(1(1 . C * ; . 13)'0 * . C * ;91 * 0@4 2': * & :; * # * 4848) ( * :W46;81J== * ; >* 7 * :J:3)(1 * . >S: 7 ( * ; * 4 7 48481=:31 *''* 0@461 >B)0-C"25;62 * 48;8) (l; 1 C"254946) 2'==1J); * (1 7 0-> * ;948)^ LAKJL >S)0 ;62'=1J)0"2 * 0@48)C 7 ;62 * 0 4 * = * ) * 48;81J>B) . 1?;913>B2 ' 2: 2,; * :32 U 1J)0 * V6 LAKJL+ ^ ` LAKJL Z #$ c &

2 7 * . 4 2 & >B)'0 6 LAKJL+ & Z # 6 A KQM &>* C ) .9. 1 13: * :32 . 461 2( * : C2';62 * 48;8)(l; 1 C"254848) 2 .9. 1 )VP@b

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. 1 . 4 * 2 6 A KQM ^ LA K*LQ < Q ]-654@& 4 Z &P 1 Q < [ # ] 4 d Z ]] 1 " 2-:31J0 * 2 . * = 7 1A4 2 >* :32 . 4 * .8. 2K> * C * ; 1J:?> 2 . )HC1J) )5D C13) )V =:31<2'0("2 * 0@481?( * :0 7 * ;8)T(1 +* # % # * ( * :J: 2 ( * 0 . 1A4 >2 . )'0)T> 2':J>B):325461M130 )W() 2'0"2':J1J461J>B) * 13: C;9)5D=;62 2,(1 . 1 ,7 : 2 U 13)'0 * >* 7 461J:31 USU 2548)>B) * ;81 . >B)'0 48;8) $ 13>S);8(1 2 )> * 0 * : ) ( * :J:3) (1 : 2 7 O* ; :32> 25;625494 * ;91 USU 2 U 13)0 * (1 7 0 0 7 >B: * ) >* ("25462,("2': 0 7 * ;8)(1 2 .8. 2* ("2':J: 2-(1 . 46;91 7 U 13)0 * (1 ( * 0 . 1A4 >2 [ ) )W(WD Q 2VUW)0 $ M* ;L:J) U )': 1 ) & >B) * C * ; 13: C1J) ) & 1C"2';62 * 46;81W( * :J: 2 [ ) )W(WD Q 2VUW)0 . )0) . 481 25461 . #] 0 254946;62 ''* ; . ) 1 .97 ; * (1 . >B25484 * ;81J0= * :32D. 461J>B) * : * 4846;9)0 * D 0 7 >B: * ) $5N :W4 7 0= . 4 * 0) C; * . * 0@462 & 130 '* > *& 7 0"2 >S) C:313>B2 U 1J)0 *& 130 7 2'0@48)

>* >S: 2 .9. 1 7 > 2548)>B) * 0 7 >B: * )0)0 . 1 * ;813>S) $" 2 ( * 1 ); 2 U 13)0 * (1 7 0H0 7 >S: * ) ' 1 * 0 * . 481 254 2 254946;82 ''* ; . ):32 1 .87 ;82 ( * 1 .97 )1 ) * 0WD461 (1 ,7 :A461JCO):J) 2'=0 * 461J>B1 $ " 2 .97 C * ; 7 >B1 * ( * : 0 7 >S: * ) >* ( * . >B;81A48462 130 7 0 . 1 . 4 * 2 >B)0>B) );8(1J0"254 * >B1J:31J0(;81J> * >B)0 );913=1J0 * 0 * : .97 )T> * 0 48;8) ("25:3:; * . C; * .8. 13)0 * C"2';62 * 46;81 UBU 254 2130 4 * ; 1301O(1 2'; )01J> * . 1 * ;81J> * . #@b 0 V c+ W 8 ] <M ` M 8M X #$ c ] () '* W 8 >* >B2':3>S): 246) 1J0 )W() ("2 >S)0 . * ; ' 2'; * 13: ' ): 7 * ( * :Z0 7 >B: * ) * 1 >B) * >B1 * 0@461

` * ( * . >B;91 ' )0) ;91 . C * 49461 ' 2 * 0 4 * : * ( * 1 )'; 2 U 1J)01?(1 7 2'(; 7 C ):3) * * . 2'( * > 25CO):J) &> * . )'0) : * C1 >7 . 13='01 7 >B25461 '* $ON ' 2':3)';81?4 2 7 : 25481 . #@b 0 C * ; 1 0 7 >B: * 1M(1 C1J) ) &"U )': 1 ) *4 7 0= . 4 * 0) . )0)V 0 7 >B: * ) ` ` 8 N` D &$I&&P &N` Q & & [ &$%b54@& D &$I& @c

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( * :<0 7 * ;9)(1 +* # % # * ( * :3:32 :3)';8)( * 0 . 1J4 >2 C * ; : * >B)0(1 U 13)01 . C * ;91 * 0@4 25:31 (1[ ] P c & . 1 ,7 : 2'0()130@4 * ;62 U 13)01 Q < [ >S)0 1J:<C;9)=;62 2 $ :EAH4J6 254J69S = 2 = IRI = = 8QU 4 B : CD:&;7<= 254JI 6 CDIE4TL 2 :; 6P8O; 4J65L 294JI/6 > 4 B L 29: : 6 C@LPIRI :R8:ELP6 : *

N : )0@4 * 2';8:J)-C * ; * 484 * (1<4 * 0 * ; * >S)0@46)( * :J: 2,( * 1 ); 2 U 13)0 *L* 7. 2-: 2,C"2';82 * 46;91 U DU 2 U 1J)0 * #W$ c ] C * ; = * 0 * ;62'; * : 2= * ) * 46;8132,( * :?0 7 >S: * ) $N :O4 * . 4 >* . 4 246) . ' ):J48)= * 0 * ;62'0() 7 0 13:J13)0 * (1?>B):J:31 . 13)01 Q < [ >B)'0 0 7 >S: * )(1G4 7 0=5D. 4 * 0) [ . 1 * ;81J>B) \ C"25;62 * 48;81 USU 2 U 13)0 * 2':3:32 [ ) )W(WD Q 2VUW)0 * 2':J48; * 494 2'0@4 * >S)0 0 7 >B: * )H(14 7 0= . 4 * 0)D[9( * 1 ); 2546)\ ^C"2';62 * 46;81 UBU 2 U 1J)0 * #$ c ] >B)'0 1 >S) * >B1 * 0@461 ;813C ); 4 25481/130462 * :3:32 $<Q )0) . 4 254 * C )1 >S)0 1 ;9)0@4 254 * : * (1J48;81 7 U 1J)01M(1 )'484 * 0 7 4 * 0 * 1 ( 7 * > 2 . 1C * ;>B):J:31 . 13)01 #&% # m 2 # ' +2': * 0) b +* # % # * : * (1 . 46;81 7 U 13)01`; * : 2461 ''*25:3:;I2'>S> * 494 2'0 U 2(1G48;813='= * ;/(1 [ ] P c & ^ ^ LAKJL+ d Z ]] 1 $N 0 7 = 7 ;62 #$%b54 . 1 '* ( * > * :32( * 1 ); 2 U 13)'0 * ( * :?0 7 >S: * )H(1<4 7 0= . 4 * 0)K( * 4 * ; 130"2 7 025:3: 25;8=@2 * 0@48) ( * :3:32&[9>S)W(2\,( * :3: 2 (1 . 46;91 7 U 13)0 * ( * :G0 7 * ;9),(1 +* # % #;81 . C * 4946)25: > 2 . ) 130 > 7 1 :3) . 1 >B)'0 . 1J( * ;91 . 1 * ;913>B) (1`>B)0 . * = 7 * 0 U 2 . 1 "2 7 0 2 7 * 0@46) ( * : ' 2':3)'; * (13) + (1W>B13;9> 2L:-; ] Z 4 $ * :;82'0= * (1W> * 0@46;82':31A4 >2 >S)C * ;948) ("2 [] P c 7 = 7 ;62 #$ b c W sfericoW deformato

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5000

0 20 40 60 80 100 120 140 160

13= 7 ;62 #W$ b c V # ' # 2 m # ( % %9m ( )# +* # % ##&% < % ; % ' )# . ^ d Z ]] 1 0 : 2L(1 . 48;81 7 U 1J)0 * (1 ;81 .87 :A4 2 2':J: 2';9=@25462 2 >B2 7. 2 ( * :3:32L( * 1 )'; 2 U 1J)0 * ^:3) . > 2'; 46) 7 2D(;6254813>S) * (1J) 2 7 * 0 462 ( * : 4 & 2T13: .87 ) ' 25:3); * (1J) ;91 2'0 * . ) . 4 2'0 U 1 2': * 0@4 *130 ' 2';8132546) +2 7 * 0@4 2L( * :3:J) & Z b $ " ;%2 7 * 0@46)L( * :3:32 (1 . C * ; . 1J)0 * ( * :3:32 (1 . 48;81 7 U 1J)0 * (1 >* () ' 7 48) 2': 1 254946) > * :;I2 . 1 * 46;8132 ( * :"0 7 >B: * )( * 1 ); 2546) 1J0>B; * * 0@4 2 1J:0 7 * ;8)( * :J: * C ) .8. 1 1J:31M>B)0 7 = 7 ;62 U 13)'01 ( * 1( 7 * 0 7 >B: * 1`2': ) * 0@46)T( * :3:; 130@4 * ;62 U 13)'0 * 1 2'> * 0()2':3:32';8=@25; * 1J:G;82'0= * (1 +* # % #/25>B> * .8. 1 1J:31?2':J: 2; * 2 U 13)0 * $Q 1 C 7 >) >S)0>B: 7 ( * ; * > * 2'0> * C * ; :32H( * 0 . 1A4 >2H0)0 ' 1 . 1 2'0) * # * 49461 (1 ;81J:31 * ' ) * > * . 1CO) .9. 2-( 7 0 7 * 46;82 . > 7 ;625; * : 2,0)'0WD . 1 * ;81J>B1A4 >2,( * : 4 7 0= . 4 * 0) $ ;G: > = 254JI IE4 N = B : = 'K:RI : 29:fC@4J6F; BG= IR:E;J<=N :@0 7 * ;8) (1 /+* # % # * : 2 ( * 0 . 1A4 >2 . )0) . 4625461@>B2':3>S): 2461'1J0 ) () 2'0"25:31J4813>S) & 7. 2'0(): * 1 ); ,7 : * #W$ b c * #$I# c $ "?* . 481 * )0@4 * 25;8:3) . )0) . 46254 * 1 2484 * >S) * 0 * : >B2 . ) < $ N =;62 7 >B1 130 7 = 7 ;62 #$ b d C; * . * 0@4 2'0) =:312'0("2 * 0@481@130 1 7 0 U 1J)0 * ( * : C2';62 * 48;8)(l;I1 C254848)V":;I2'>B>S);8()48;62K>B2':3>S):3)2'0"25:31J4813>S) * . 1 ,7 : 2 U 13)'0 *J>* 7 )0) . 1 2-C * ; Q < Q > *C * ; Q < [ $" 2 . 481 2 ( * : ' 2':J); * (13) (1 - * (1 7 * :J:3) (1 ) >* )5484 * 0 7 4 2L1J0 ) () 2'02':3)=') 2 7 2'0@46) 1 254946) C * ; < <& 2 7. 2'0(),1J:R:31 1J4 * .87 C * ;913); * .97 :GC"25;62 * 48;8)(<;I1 C"24846) &

P c

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0

20

40

60

80

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0 2 4 6 8 10 12 14b (fm)

<NW

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b (fm)

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0.5

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1.25

1.5

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13= 7 ;82 #W$ b d VHm +( )# +* # % # %!'# "! )# +* # % # #&% m7% # ( % ( # ( 250 U 1J>* : 2 )':J4 * C:31J>B1A4 >2(1?C"2'; 4613> * :J: * >B2';81J> * & >S) *]' 1J0>B):J) .87 :J: 2,> * 0@46;82':31A4 >2V

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' #&% S =@2 7.9. 1 250)V<:-;%2'0("2 * 0@46)T( * :3: 2 ( *' 1 2 U 13)0 * . 4 250("2';9( 1J0 1 7 0 U 1J)0 * (1^ >* ;81J> 2 ' 2546)-("25:3: 2 . 1 7 : 2 U 13)0 * >B)0 $N ' 2':J);81<>S) . > n )5484 * 0 7 461 . )0)V

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9 , E , ] 7 * . 48)-C 7 0@46) >* CO) .9. 1 13: * >S)0 1 ;8)'0 462'; * 130 )W()>B) C: * 48),: 2 0 7 ) ' 2 . > 2':32 . 4 7 (1 24 2>S)0 7 * :3: 2 7 0);82 7. 254 2 130 [ ] 6W$ N =;82 7 >S1O1J0 7 = 7 ;62 #W$ b 6 C; * . * 0 462'0)=:J1R2'0("2 * 0 481( * :0 7 * ;8) * ( * :J: 2 ( * 0 . 1A4 >2 (1 +* # % # 1J0 1 7 0 U 13)0 * ( * : C2';62 * 48;8) (l; 1 C"254848)C * ; 1 ' 2';81 . 1 . 4 * 1`2'0"2':J1 USU 25481 $GN : 1 24846) C1 >7 0)54 *' ): *O>* > * C * ; >B)':3:31 . 1J)01 > * 0@48;62':J1:32

0

50

100

150

200

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400

0 2.5 5 7.5 10 12.5 15 17.5 20

Pb+Pb

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( * 0 . 1J4 >21J0 C < N>* 2'==1J); * > * 1J0 Q < [ * ( 25==13)'; * (1 7 * :3: 2(1 Q < Q C * ;/4 7 494611 ' 2':J);81 (1^ $ N 0 7 = 7 ;62 #$%b'P & () '* . )0) ;81JCO); 4 25481 0 * :`C132'0) X ) 1`C 7 0@461>B);9;81 . CO)'0( * 0@481 2':3: * 7 254946;8)->S: 2 .9. 1?(1 < * 2C < C * ; [ ] 6 * 7 * :J:31 . 461 25481C * ;=:J1 * . C * ;81 * 0@461 [ ] P c Q < [ * [] 4 Q < Q & . 1 ''* ( * > * C * ;,148; * . 1 . 4 * 10 7 >B: * )5D 0 7 >S: * ) : 2 ; * :32 U 1J)0 * 46;82 : * ( 7 *,' 2';91 2 13:31 (1Z> * 0@46;82':31A4 >2 >* : 2 . 4 * .8. 2 130 1 2548481 & 1C 7 0@461 (1 U ): 1 )5D U ): 1 ) * U )': 1 )5D 4 7 0= . 4 * 0) . 1 (1 . CO)0=)0) .87 :J: 2 > 7 ; ' 2 130(1 ' 13( 7 254 2 ("2C13) )5D C13) ) :J130 * 2K>B)'0 48130 7 2 $ 7 130(1 & C * ; >B):J:31 . 13)'01 0 7 >B: * )5D 0 7 >S: * ) & : 2 ( * 0 . 1J4 >20)0TCO)';94 2 ' 2';91 2 U 13)01O0 * 1?;81 .87 :A4 25481 7 02':31 & . * 0)0T: 2,>B) C; * .9. 13)'0 * ( * :J: 2 . > 2':32 & (1G> 7 1. 1 >* ( * 4946) $N 0 C;8)'48)0 * D C13) )1J:G0 7 * ;9)H(1?C2';94 * >B1JC"2'0@461 >* ):J48) * . 13= 7 ) & 2:32,:3);9)( * 0WD. 1J4 >2 0 * :/C132'0) 46;82 . ''* ; . ) >*T* : *' 25462 & 130 >S)0 . * = 7 * 0 U 2 ( * :3: * ;81J()'484 * (1 * 0 . 13)'01 ( * :AD: 2 ; * =1J)0 * 130@4 * ; * .9. 25462 ("2':J: 2T>B):J:31 . 13)0 * 1J0 * :32 . 4813>B2 ^( * :J:; );8(1J0 * ( * :J: 2 . *BU 13)0 * (l; 7 ;946)0 7 >B: * )0 * D 0 7 >B: * )0 * $ * :J: * 7 = 7 ; * #$%b * #$I#& : * C ) . 1 U 13)'01 . 461 254 * C * ; 1 . 1 . 4 * 1 Q < Q * Q < [ 0 * :3: * ( 7 * . >B2': *(1W> * 0@46;82':31A4 >2 . )0)L130(1J> 254 * >S)0( * :3: * 1 ; * >B> * V':-; 7. ) ( * :3:32 . > 2':32L("25462L("2':J: 2 ( * 0 . 1J4 >2LCO)'; D4 225:3:3) . >B2 1J)( * 1 . 1 . 4 * 1 C < K* Q < QO$ N : 1 24846) > * 1J: 0 7 * ;9),(1 /+* # % # . 1 2

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1

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2'=='13); * 130(13>B2L>1 25;62 * 0@4 * > * :32 + 2& >* C1 >7 * . 4 * . 2130>B)':3:31 . 1J)01 U )': 1 )5D U ): 1 )L> *1J0>S):3:J1 . 1J)01C;8)'48)0 * D C13) ) $ " 2 ( * 0 . 1J4 >2L(1 0 7 >B: * )01WC * ; 1 * ; 1 7 2'(;62548) & : * =@24 2 C1 >7(13; * 48462 * 0@4 * 2':J: 2 ( * 0 . 1J4 >2-(1 * 0 * ;8='1 2 & . * ;62 & 130 '* > * &* .8. * ; * C1 >7 * : *' 254 2 130 . * = 7 1A46)25( 7 02->S):3:J1 . 13)0 * C;8)546)0 * D C1J) ) $ 1 . 46)> * :;I2':J462L( * 0 . 1J4 >2 (1 * 0 * ;8=132 ( * :J: 2 + 2& * :32 .87 2 * . 4 * 0 . 1J)0 * . C"2 U 1 2': * . )'0) : *( 7 * > 2';825484 * ;91 . 4813> * ( * : . 1 . 4 * 2L> * C * ; * 4848)0) :32 46;82'0 . 1 U 1J)0 * (1 1 2 . * & 7 0>B)0 1 ;9)0@46)48;62=:31 W# ( * 1 2';913)01 . 46;82'01 130 C < * 7 * :J:31 130 Q < Q & 7 0"2 ' ):J462H(1 . C )01 13:J1 & >S1>S)0 . * 0@461J; >2 (1 13=:J13);82'; * : 2T>B) C; * 0 . 13)0 * ( * :3:; 1 C );9462'0 U 2 ; * :325461 ' 2 (1 7 * . 4 * ( 7 *>B2';62484 * ;81 . 461J> * $

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. ):3)C * ; 7 0> 2 C1J)0 * :31 1A4 2548) (1 *'* 0@461 ) . 48;62 >1 25;62 * 0@4 * :32 ( * ;91 ' 2 '* ; . ) :;I2':J48)( * : '* ;94813> * C;91 2';81J)0 * :3:; 130@4 * ; ' 2':J:3) (1 m7% (1<> 7 1 . )C;82 $N 0 >S)0 . * = 7 * 0 U 2( * :3: * ) .9. * ; ' 2 U 1J)01 1 25484 * & C * ; 7 * . 4 2-2'0"25:31 . 1RC; * :31 1302'; *& ) * . >B: 7. ):-;I1J0@4 * ; ' 2':3:J) (1 m7% c ] && D c5dd & & : 2 > 7 1 )':J4 * C:31J>B1A4 >2 () ' ; >2 * .8. * ; * 130 . * = 7 1J48)>B);9; * 494 24 * 0 * 0() >B)0@46) ( * :J: 2/C ) . 1 U 13)'0 * ( * : ''* ;94813> * C;91 2';81J) $ N ;81 250 * 0@461 mJ% 0)0 C; * . * 0@4 2'0)C2';94813>B)': 2';91<2'0) 2':J1 * * CO) .9. )0) * .8. * ; * ;62'=='; 7 CC25461<1J0 7 0 7 013>S)>B2 C13)0 * $ H Q H

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0

0.002

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0 200 400 600 800 1000 1200 1400

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datifit

0

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0 200 400 600 800 1000 1200 1400

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Nch

dσ/d

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datifit

1 2 3 4 50

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