JOLANTA BRODZICKAInstitute of Nuclear Physics, Krakow

October 10, 2003

Doubly charmed B decays

B D(*)D(*)K( for ~140 fb-1 )

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

Analysis details (no changes) good charged tracks with abs(IP_dz)< 5cm abs(IP_dr)< 0.4cm

R2< 0.3 K± : P(K/) > 0.4 ± : P(/K) > 0.1 electron veto: el_id < 0.95 K0

S abs( M(+ -) - MKs ) < 15 MeV only good_Ks 0 E > 50 MeV abs( M( ) -M0 ) < 15MeV D0 reconstr. ( p(D) < 2 GeV in (4S) system)

D*±, D*0 reconstr. ( p(D*) < 2 GeV in (4S) system)

B±, B0 reconstr. B vertex fit: with IP and B lifetime constraints

• BF ~ 28% ( K , K3 , K0 , Ks , KsKK , KK )• M (DREC) cut: ± 20MeV (D0 K0 : ± 50MeV)• vertex fit (conf_level>0.) , mass constraint fit

• D*± D0 ± ( D*± D± 0 hopeless ) D*0 D0 0 ( D*0 D0 difficult )• abs(M(D*±)-M(D)-mPDG)< 2.5MeV abs(M(D*0)-M(D)-mPDG)< 5MeV • vertex fit (conf_level>0.)

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

best B candidate choice method

B(MB(MDD))LR_D (MLR_D (MDD) ) =S(MS(MDD))

S(MS(MDD))++D probability :

S(MD), B(MD)parameterization from MD fit

B probability for : LR_B = LR_D(*)LR_B = LR_D(*)11 ×× LR_D(*) LR_D(*)22

best B candidate : with max LR_B

LR_DLR_D** ((MMDD**) =) = D* probability : S(S(MMDD**))S(S(MMDD**)) B(B(MMDD**))++

S(MD*), B( MD*) parameterization from MD* fit

LR_B cut used also for background discrimination

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

B± D0 D0B K±

S=94.4± 13.0 eff = 4.91*10-4

BF = ( 1.27 ± 0.17 ) * 10-3

E

N/7.

5MeV

N/2M

eV

Mbc

LR > 0.04

Plot for Mbc>5.265 GeV

plot for abs(E)<25MeV

Fully reconstructed signal (from 2dim likelihood fit)

XNSIG_1 94.412 ± 12.974 XE0_1 -0.3193E-02 ± 0.1116E-02XEW_1 0.5890E-02 ± 0.0751E-02XM0_1 5.2815 ± 0.2860E-03 XMW_1 0.2506E-02 ± 0.0371E-02

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

B0 D*± D0 K± LR > 0.05

Fully reconstructed signal(from 2-dim Mbc vs.E likelihood fit)

XNSIG_1 86.957 ± 10.600 XE0_1 -0.18782E-02 ± 0.09514E-02 XEW_1 0.68986E-02 ± 0.08763E-02 XM0_1 5.2807 ± 0.4122E-03 XMW_1 0.3034E-02 ± 0.0311E-02

S = 86.9 ± 10.6 eff = 2.94 *10-4

BF = ( 1 .94± 0.24 ) * 10-3 (stat. error)

Plot for Mbc>5.27GeV

Plot for abs(E)<25MeV

E

Mbc

N/7.

5MeV

N/2M

eV

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

B± D*0 D0B K+ , D*0B D0 K- ( right D*0K flavor comb.) LR > 0.01

Plot for Mbc>5.265GeV

Plot for abs(E)<45MeV

E

Mbc

Fully reconstructed signal (from 2-dim likelihood fit)

XNSIG_1 49.350 ± 11.649 XE0_1 0.1004E-02 ± 0.4319E-02XEW_1 0.1821E-01 ± 0.0427E-01XM0_1 5.2819 ± 0.9850E-03 XMW_1 0.3991E-02 ± 0.0853E-02

S = 49.4 ± 11.6 Signif.= 7.0

eff = 0.63 *10-4

BF = ( 5 .16 ± 1.21 ) * 10-3 (stat. error)

N/7.

5MeV

N/2M

eV

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

B± D*0 D0B K± ( both D*0K flavor comb.) LR > 0.01

Plot for Mbc>5.265GeV

Plot for abs(E)<45MeVE

Mbc

Exclusively reconstructed signal (from 2-dim likelihood fit) XNSIG_1 77.897 ± 13.715

XE0_1 0.1496E-02 ± 0.3919E-02XEW_1 0.1905E-01 ± 0.0325E-01XM0_1 5.2816 ± 0.6192E-03 XMW_1 0.3371E-02 ± 0.0556E-02

N/7.

5MeV

N/2M

eV

Partially reconstructed signal

Plot for abs(E+0.16)<50MeV

N/2M

eV

XNSIG_2 337.34 ± 36.48 XE0_2 -0.1619 ± 0.0028XEW_2 0.4237E-01 ± 0.0475E-01XM0_2 5.2816 ± 0.8236E-03 XMW_2 0.7317E-02 ± 0.0801E-02

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

B± D*± D0 K0s LR > 0.005

Fit results for directly reconstr. signal (from 2-dim Mbc vs.E likelihood fit)

XNSIG_1 40.245 ± 10.121XE0_1 -0.1310E-02 ± 0.2545E-02 XEW_1 0.1098E-01 ± 0.0265E-01 XM0_1 5.2808 ± 0.8034E-03 XMW_1 0.27644E-02 ± 0.7662E-03

S = 40.2 ± 10.1Signif. = 7.5

Plot for Mbc>5.27GeV

Plot for abs(E)<25MeV

N/2M

eVN/

7.5M

eV

E

Mbc

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

B0 D* ± D*0 K±

XNSIG_1 43.420 ± 10.116 XE0_1 -0.3409E-02 ± 0.7449E-02 XEW_1 0.3055E-01 ± 0.0709E-02 XM0_1 5.2814 ± 0.8450E-03 XMW_1 0.3218E-02 ± 0.0742E-02

E

Mbc

LR > 0.0

Fitting results (2dim fit)

Plot for Mbc>5.27GeV

Stat. signif. = 7.1

Plot for abs(E)<45MeV

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

Possibility of Ds1+(2536) detection

Generated 20K MC decays:

B+ Ds1+(2536) D0B (Ds1)=5MeV

Ds1+(2536) D*0 K+ D0,D0B K

For directly reconstr. signal: B+ D*0 K+ D0B

M ( D*0K±)

N 140M0 2536 7.1

For partially reconstr. signal: B+ D0 K+ D0B + missing pion

M ( D0K±)

N 1420M0 2393 5.0

-143MeV shift

N/1M

eV

N/1M

eV

LR > 0.01

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

Possibility of X(3872) detection (if any ) Generated 20K MC decays:

B+ X(3872) K+ (X)=5MeV Mmin=M(D*0+D0)X(3872) D*0D0B D0,D0B K

N/1M

eV

N/1M

eV

M ( D*0D0B) M ( D*0D0B)

N 1100 N 3400

For directly reconstr. signal: B+ D*0 D0B K+

For partially reconstr. signal: B+ D0 D0BK+ + missing pion

LR > 0.01

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

Dalitz plot for B± D0 D0B K± for signal-box events: abs(E)<25MeV Mbc>5.27GeV

M2 ( D0D0B )

M2 (

D0K

± )

ri

ght

M ( D0K± ) right

M ( D0D0B ) M ( D0K± ) wrong

N/10

MeV

LR > 0.04

(3770)

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

M ( D0D0 )

M ( D0K± ) right

M ( D0K± ) wrong

mass distr. for B D0 D0B K± + missing for lost signal-box events: abs(E+0.16)<50MeV Mbc>5.265GeV

N/10

MeV

LR > 0.1

Hatched histogram: Mbc sideband events abs(E+0.16)<50MeV Mbc<5.26GeVnormalized to backgr.in pion_lost signal box

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

M2

( D

0K±

)

M2 ( D*±D0 )

M ( D*±D0 )

M ( D0K± )

M ( D*+K- )

Dalitz plot for B0 D*± D0 K± for signal-box events: abs(E)<25MeV Mbc>5.27GeV

N/10

MeV

LR > 0.005

?

Hatched histogram: Mbc sideband events abs(E)<80MeV Mbc<5.26GeVnormalized to backgr.in signal box

M ( D*+K- )

also for LR > 0.01

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

M ( D*±D0 )

M ( D0K± )

M ( D*+K- )

mass distr. for B D*± D0 K± + missing for lost signal-box events: abs(E+0.16)<50MeV Mbc>5.265GeV

N/10

MeV

LR > 0.05

Ds1 ? Hatched histogram: Mbc sideband events abs(E+0.16)<50MeV Mbc<5.26GeVnormalized to backgr.in pion_lost signal box

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

Dalitz plot for B± D*0 D0B K± ( both D*0K flavor comb.) for signal-box events: abs(E)<45MeV Mbc>5.265GeV

M2 ( D*0D0 )

M2 (

D*0

K± )

M ( D*0K±) right

M ( D*0D0 ) M ( D0K± )

3.87GeVN/10

MeV

LR > 0.01Hatched histogram: Mbc sideband events abs(E)<80MeV Mbc<5.26GeVnormalized to backgr.in signal box

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

M ( D*0D0 )

M ( D*0K± ) right

M ( D0K± )

mass distr. for B D*0 D0B K± + missing for lost signal-box events: abs(E+0.16)<50MeV Mbc>5.265GeV

N/10

MeV

LR > 0.01

Hatched histogram: Mbc sideband events abs(E+0.16)<50MeV Mbc<5.26GeVnormalized to backgr.in pion_lost signal box

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

Dalitz plot for B± D*± D0 K0s for signal-box events: abs(E)<25MeV Mbc>5.27GeV

M2

( D

*±K0

s )

M2 ( D*±D0 )

M ( D0K0s )M ( D*±D0 )

M ( D*±K0s )

Hatched histogram: Mbc sideband events abs(E)<80MeV Mbc<5.26GeVnormalized to backgroundin signal box

N/10

MeV

LR > 0.002

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

M ( D*±D0 )

M ( D*0K0s )

M ( D0K0s )

mass distr. for B D*± D0 Ks + missing for lost signal-box events: abs(E+0.16)<50MeV Mbc>5.265GeV

N/10

MeV

LR > 0.05

Ds1 ? Hatched histogram: Mbc sideband events abs(E+0.16)<50MeV Mbc<5.26GeVnormalized to backgr.in pion_lost signal box

JOLANTA BRODZICKA October 10, 2003B D(*)D(*)K

Dalitz plot for B0 D* ± D*0 K± LR > 0.0 for signal box: Mbc>5.27GeV abs(E)<45MeV

M2 ( D*±D*0 )

M2 (

D*0

K± )

M ( D*±D*0 )

M ( D*0K± )

M ( D*±K )

~7 events at the threshold at 2.54 GeV come from Ds1± (2536)-> D*0K± ?