Super Flavour FactoryPresentation of the Physics case Part

Paris 9 May 2007

444 pages

320 signers~80 institutions

M. Ciuchini, T. Gershon, A. Stocchi

The way we build the SuperB Physics Case :

Experimental reach. -Precision we could reach on different measurements. -New measurement possible ? - U(4S), U(5S) and charm at threshold.

Phenomenological impact. - SM - NP search + no loose theorem exists ? + MFV (mainly high tan) + MSSM - charm physics - tau physics LFV

People who contributed to the Physics Case chapter.D. Asner, R. Baldini-Ferroli, E. Baracchini, E. Ben Haim, A.Bevan, I.Bigi, M. Bona, M. Ciuchini, J. Dingfelder, P. Gambino, T. Gershon, K. George, T. Hurth, G. Isidori, V. Lubicz,, V. Lutz, P. Paradisi, M. Pierini, F. Renga, M. Roney, P. Roudeau, M.A. Sanchis-Lozano, L. Silvestrini, F. Simonetto, A. Stocchi,

Presentation in plenary Session by Marco Ciuchini

B factories have shown that a variety of measurements can be performed in the clean environment.

By doing the work of extrapolating the existing measurements and the ones which will be possible with more statistics we observe that :

- Several measurements are statistically limited and so it is worthwhile to collect >50ab-1

- The systematic errors are very rarely irreducible and can almost on all cases be controlled with control samples.

On top of it detector improvements can be crucial for some analyses.

B

D

Dprim.

sec

ter.

B events continuum events

Thanks to better vertex resolution we can distinguish on vertex requirements

B vs continuum events ( ~factor 5 background rejection)

Not yet included in the extrapolations

Experimental Reach

The angle

Based on the present “savoir faire”

0.678 0.026 0.002 0.021

t(ps) t(ps)

535MGolden B0 J/ K0

sin2 gives the best constraint on planeand the error can still be reduced

Example other modes : B0 D0 h0

0.56 0.23 0.050.23 0.16 0.04

SC

BabarSuperB will be able to make complementary measurements

(beyond J K0) that help to ensure that the theoretical uncertainties are under control and to control them on data

Important points : - We know how to perform these analyses- Very significant improvement from now2ab-1 Superb luminosity

SuperB

(talk of Catherine Goerge)

The angle

Isospin analyses performedat the B-factories

@ 100

Some very important measurementsstart to be possible only now with

about 0.5ab-1

0 0 6( ) (1.07 0.33 0.19) 103.5 evidence

Br B modes

consistent with no CP violation eff~90o (0/180)o

Important measurement because it givesthe contributions of Penguins diagram

Each of analysis will be allow to get (~2 degrees

It allow consistency checks and to control theoretical uncertainties on data

~1o

possible

SuperB

(*) theoretical limited

(talk of Adrian Bevan)

The angle

Many independent methods GLW, ADS, Dalitz, with many different decay channels

~1o

possible

(82 20)o

New D0 decays startingto be explored

(25 48)o

BaBar

Error vs DCP statistics

750pb-1

(4-5)o

20fb-1

(<1)o

Bondar Poluektov hep-ph/0510246

SuperB

The model error can be reducedby running at threshold

Best measurements from Dalitz analysis with D0Ks

1518

(92 41 10 13 ) BaBar(53 3 9 ) Belle

stat

ostat syst Dalitz

osyst Dalitz

(talk of Alex Bondar)

Many channels can be measured with S~(0.01-0.04)

sin2 from “s Penguins”…

SuperB

(*) theoretical limited

d d

sbW

B0d

t ss

K0

g

sb b s

~

~ ~

LRd

23

(talk of Catherine Goerge)

Exp. likelihood BABAR+BELLEBR(B → τ ν) = (1.31 ± 0.48)10-4

leptonic decay Bl

Br(B up to 3-4% (below limited by systematics)Br(B can be measured with the same precision not limited by syst.

Milestone :First leptonic decay seen on B meson

SuperB

(+) systematically limited

BR(B → τ ν) = (0.85 ± 0.13)10-4

SM expectation

First test can bedone, not yet precise

0 0B

Radiative B decays

- many measurements on Bs- measurements of Br on B- measurement of ACP on exclusive and inclusive modes

Significant improvement on bd ACP in inclusive decay at ~0.5% ! (SM~0.5%)

-Measurements of Br done-We start to perform AFB measur.

CP and FB asymetries in sll exclusive and inclusive decays at few per cent

(+) systematically limited (*) theoretically limited

SuperB

SuperB

Could the SuperB be a

Super Flavour Factory ?

Which is the interest ?

Charm physics at threshold

D decay form factor and decay constant @ 1% Dalitz structure useful for measurement

0.2 ab-1

Rare decays FCNC down to 10-8

Consider that running 1 month at threshold we will collect 500 times the stat. of CLEO-C

~1%, exclusive Vub ~ few % syst. error on from Dalitz Model <1o

D mixing

CP Violation in mixing should be now better addressed

String dynamics and CKM measurements

Charm physics using the charm produced at (4S)

Charm Physics

Better studied usingthe high statistics collected at (4S)

@threshold(4GeV)

@th

resh

old(

4GeV

)

HFAG preliminary

(talk of David Asner Ikaros Bigi )

*

Integrated quantities ASL and ACH at less than 0.5%Even a run at 1ab-1 will give less 1% error.

Run at the (5S) Possible with the same luminosity

BB from B*B produced in C=+1 after BB decay some sensitivity to S term in time integrated CP asym.

BdBdBd*Bd

Bd*Bd*

BsBsBs*Bs

Bs*Bs*

Bd,B+ produced with factor 6 less

than at (4S)

Dominated contribution

~95%

For more details see E. Baracchini et al. hep-ph/0703258

*

Bd(B+) and Bs are produced and can be separated

(talk of Francesco Renga)

In summary..

1) superb measurements related to tree level/ ~tree level (some depending upon LCQD calculations )

(DK), Vub /Vcb

2) superb measurements very sensitive to NP Physics sin(2) (Peng.)AFB (Xsl+l-), AFB (K*),

ACP (K*), ACP (s), ACP(s+d))

BK(*), LFV

3) several quantities depending upon LCQD calculations If Lattice QCD Calculations improve as the related experimental quantities, these measurements will be extremely powerfull

Br(B (,)

Br(B l), Br(BD)

4) <1% UT Fits for New Physics search (all the measurements mentioned before + others..)

5) charm measurements

6) Specific run at the (5S)

2 – 3%4 - 5%5.5 - 6.5%11%3 – 4%--------13%

0.5%(5% on 1-)

1.2%(13% on 1-)

2%(21% on 1-)

4%(40% on 1-)

B → D/D*lν

0.5 – 0.8 %(3-4% on ξ-1)

1.5 - 2 %(9-12% on ξ-1)

3%(18% on ξ-1)

5%(26% on ξ-1)ξ

1 – 1.5%3 - 4%4 - 5%13%1 – 1.5%2.5 - 4.0%3.5 - 4.5%14%fB

1%3%5%11%

0.1%(2.4% on 1-f+)

0.4%(10% on 1-f+)

0.7%(17% on 1-f+)

0.9%(22% on 1-f+)

1-10 PFlop Year

60 TFlop Year

6 TFlop Year

Current lattice error

Hadronic matrix

element

KB̂

Kπ+f (0)

1/2Bs Bsf B

Bπ+f ,...

B K*/ρ1T

Estimates of error for 2015

PhenomenologicalImpact

= 0.163 ± 0.028 = 0.344± 0.016

about 10 times better (not all measurements yet included…)

= ± 0.0028 = ± 0.0024

SuperB+Lattice improvements

In SMToday

The problem of particle physics today is : where is the NP scale ~ 0.5, 1…1016 TeV

The quantum stabilization of the Electroweak Scalesuggest that ~ 1 TeV LHC will search on this range

What happens if the NP scale is at 2-3..10 TeV…naturalness is not at loss yet…

Flavour Physics explore also this range

We want to perform flavour measurements such that : - if NP particles are discovered at LHC we are able

to study the flavour structure of the NPflavour structure of the NP- we can explore NP scaleNP scale beyond the LHC reach

f

bq

e f

Two crucial questions :

Can NP be flavour blind ?

Can we define a “worst case” scenario

No : NP couples to SM which violates flavour

Yes : the class of model with Minimal Flavour Violation (MFV),namely : no new sources of flavour and CP violationand so : NP contributions governed by SM Yukawa couplings.

Today(MFV) > 2.30 @95C.L.

NP masses >200GeV

SuperB(MFV) >~60 @95C.L.

NP masses >600GeV

As soon as you move from the worst case scenario…

Higgs-mediated NP in MFV at large tan

Similar formula in MSSM.

MH

(TeV

)

tan2ab-1

MH~0.4-0.8 TeVfor tan~30-60

SuperB

MH~1.2-2.5 TeVfor tan~30-60

BDlSimilar to B

Bl Excl. 2

In the red regions the are measured with a

significance >3 away from zero

23| |LR

1 10

g

sb b s

~

~ ~

New Physics contribution (2-3 families)

LRd

23

With the today precision we do

not have 3 exclusion

1

10-1

10-2

In this case the mainconstraints are bs

ACP(bs)

Today we would have magenta contour covering all the space

23Re d

LR

23Im d

LR

(TeV)gluinom

ACP magentaBr(sg) greenBr(sll) cyanAll constr. blue

MSSM+generic soft SUSY breaking terms

Flavour-changing NP effects in the squark propagator NP scale SUSY mass

flavour-violating coupling

Re (d13)LLvs Im (d

13)LL

with present disagreement

Constraint from md Constraint from sin2cos2

Constraint from sin2 All constraints

Re (d13)LLvs Im (d

13)LL

superB if disagreement disapper.

iAd j

Bd dijδ

AB

SM

Due to the actual disagreement between Vub and sin2 we see a slight hint of new physics

NP at high significance !

NP scale at 350 GeV

= 350 GeV

These evaluations do not agreewith those given in SuperKEKB :discussion undergoing

LVF and Littlest Higgs Model

LFV from CKM

107 BR

(

M 1

/2

SuperB

LFV from PMNS

SFF can perform many measurements at <1% level of precision

Precision on CKM parameters will be improved by more than a factor 10

NP will be studied (measuring the couplings) if discovered at LHC

if NP is not seen at the TeV by LHC, SFF is the way of exploring NP scales of the several TeV (in some scenario several (>10 )TeV..)

Summary

… and do not forget… SFF is also a Super-Super -charm factory…

Adjusting the central values so that they are all compatible

Keeping the central values as measured todaywith errors at the SuperB

BACKUPMATERIAL

Br ~ |Vub|2 in a limited space phase region…

Using Babar El, (Xs

El

Progress on Vub..

Inclusive : improving analyses and improving the control of the theory vs cuts

untagged analysisis the most precise

Exclusive : we start to have quite preciseanalysis of Br vs q2

Important that we measure at high q2 where LatticeQCD calculates better.

B l B Xu l

Confirming disagreement…

Precision measurements of |Vcb|

limiting factor F(1)

3.(41.93 0.65 0.07 0.67 )10

(4.564 0.076 0.003 )(1.105 0.116 0.005 )

(10.590 0.164 0.006 )%

s

s

s

s

cb fit theo

b fit

c fit

cl fit

Vm GeVm GeVBr

Inclusive Vcb still progress…

3

.(41.96 0.23 0.35 0.59 )10scb fit theoV

BaBar/CLEO/CDF/DELPHI Kinetic scheme

(1) cbF Vhere we extract :

BD*l

Essential point isto control /“measure”the effects of strong

interaction

Same for exclusive..

Study on charm sector help in the understanding of strong dynamics

(Babar)

Even

ts/0

.5

Rare decays : SuperB can cover all channels mentionned but Bs

Unless we perform a long run at the U5S

CP asymetries in radiative exclusive and inclusive decays

at a fraction of 1%

Bat 4%

CP and FB asymetries in sll exclusive and inclusive decays

at few per cent

Bat 5%

13% 2fb1Only bb back.Linear fit

Transv amplit. ??18% for 50ab-1 in Jeff

5 new free parameters Cs,s Bs mixing

Cd,d Bd mixing

CK K mixing

Today : fit possible with 10 contraints and 7 free parameters (Cd,d ,Cs,s, CK)

Con

stra

ints

Parametrizing NPphysics in F=2 processes

2 2 2

2

d

NP

q

SMi B B

SMB

C Q QeQ

F=2Fit in a NP model independent approach

0( / ) sin(2 2 )

| | | |

EXP SMd q d

CP d

EXP SMd

EXP SMK K

m C m

A J K

C

Cd d Cs s CK

D X

Vub/Vcb X

md X X

ACPJ

X

X

ASL X X

X X

ACH X X X X

ss X X

ms X

K X X

In future :

ACPJ

~X X

ASL(Bs) X X

DsK) X

Treeprocesses

13 family

23 family

12 familiy

No new physicsC=1 =0

Model Indep. Analysis in B=2

C = 1.24 ± 0.43 = (-3.0 ± 2.0)o

C = ± 0.031 = (± 0.5)o

2 2 2

2

d

NP

q

SMi B B

SMB

C Q QeQ

Bit more on Bs

C(Bs) ~ 0.026Bs) ~ 1.9o

Today at Superb

md magentaASL green cyanAll constr. blue

New Physics contribution (1-3 families)

1 10

1

10-1

(TeV)gluinom

|13

| LL

Example on how NP parameterscan be measured

Today SuperB

In the red regions the are measured with a

significance >3 away from zero

With the today precision we do

not have 3 exclusion

SuperB will probe up to >100 TeV for arbitrary flavour structure!

Let’s be more quantitative

How to read this table, two examples.

At the SuperB we can set a limit on the coupling at

2

350 ~ 201.8 10

GeV TeV

The natural coupling would be 1

we can test scale up to

21.8 10350

qmGeV

( )LL LL RR

( ~ )LL LL RR3

350 ~ 2701.3 10

GeV TeVwe can test scale up to

All this number are a factor ~10 better than the present ones