6 th International Conference on Hyperons, Charm and Beauty Hadrons July 2, 2004 Rare B Decays at...

6th International Conference on Hyperons, Charm and Beauty Hadrons July 2, 2004

Rare B Decays at LHC

Sébastien VIRETLaboratoire de Physique Subatomique et de Cosmologie, Grenoble

1. Presentation

2. Not so rare: BX

3. Rare: BX

4. Very rare: B+-

5. Conclusions

Outline

1. Presentation

2. Not so rare: BX

3. Rare: BX

4. Very rare: B+-

5. Conclusions

1 6th International Conference on Hyperons, Charm and Beauty Hadrons S. Viret

Rare B-Decays

From ‘not so rare’ to ‘very rare’

Branching ratio Radiative penguins: BdK, BsBd

Electroweak penguins: BdKBd

Many interesting observables inaccessible to classic B-factories

Not accessible to B-factories

(No Bs at B-factories)

(No precision measurements at B-factories)

Need a rare B-factory

LHC first results in 2008

Super-BaBar? Super-BELLE?

The Detector

Since 2003: reoptimized detector (VELO, RICH, TT, tracking stations)

Main characteristics:

4.6x1011

Acceptance1.9<<4.9

pTb>2GeV

230 barnbbAcceptance

Lumi.(in cm-2s-1) 2x1032

bb pairs/year

The Detector

ATLAS & CMS

Acceptance|<2.5

pTb>10GeV

100 barnbbAcceptance

Lumi.(in cm-2s-1) 2x1033 & 1034

2x1012 & 1013

bb pairs/year

B production at LHC

Rare B Factory ?

LHC = Rare B factory

LHCb ATLAS/CMS

Luminosity (in cm-2s-1) 2x1032 2x1033 & 1034

bb pairs/year 4.6x1011 2x1012 & 1013

But trigger challenging

inelastic= 80 mbarn

rare B~ picobarnfemtobarn

LHCb Trigger Strategy

For Rare B decays

Electromagnetic trigger Muon & Di-Muon

Rate (in Hz)

40 kHz

200 Hz

Radiative decays Other decays

Vertex reconstruction, topological cuts (IP, displaced vertex,…)

Full B reconstruction

Trigger entirely dedicated to B decays Low Pt thresholds

ATLAS & CMS Trigger Strategy

For Rare B decays

Single Muon+

Electromagnetic trigger

Di-Muon

Rate (in Hz)

75 kHz

100 Hz

Radiative decays Other decays

ID reco.+

Photon identification

ID reco.+

Di-Muon confirmation

Full B reconstruction

Bandwith constraints: 200 Hz at L2, 20 Hz at EF (ATLAS)

High Pt thresholds

1. Presentation

2. Not so rare: BX

3. Rare: BX

4. Very rare: B+-

5. Conclusions

Radiative penguinsPhysics interest & observables

Isospin Violation

CP Violation

Branching ratio enhancement by new

contributions

Interesting Channels (only exclusive at LHC):

BdK*, Bd, Bd, Bs,…

Interesting measurements:

Bs radiative penguins accessible at LHC

Radiative penguinsLHCb

Estimations for one year @ 2x1032cm–2s-1 (2fb-1):

9300 Bs35000 BdK*0

Study done with reoptimized detector & realistic trigger simulation:

Specific background

under control

Balso studied, lots of accessible channels

=65 MeV/c2=64 MeV/c2

Radiative penguinsATLAS

BdK* Bs

Preliminary results

Non-optimized offline cuts, resolution (>100 MeV/c2)

could be improved.

[2500,3200] Bs[4200,8500] BdK*0

Trigger strategy dependent

Radiative penguinsATLAS/LHCb comparison after 1 year

Int. lumi.

20 fb-1

2 fb-1

S/√B

Results limited by background statistics, S/B might be much better (particularly for Bs)

Significant amount of statistics after just one year of LHCb

Parallel measurements possible with ATLAS if radiative penguin trigger accepted

1. Presentation

2. Not so rare: BX

3. Rare: BX

4. Very rare: B+-

5. Conclusions

Experimentally speaking…

Branching ratio enhancement by new

contributions

CP Violation

Forward-Backward Asymmetry (Dimuon-cms system)

Many interesting observables:

… and also the di-muon mass spectrum,etc…

Hunting New Physics

Phys.Rev. D61 (2000) 074024 Differences between SM and models predicting C7

eff>0 (SM predicts C7eff<0)

FB AsymmetryLarge differences for small s

if C7eff>0

SUSY 1, 2, and SM with C7

SUSY 1 & 2 with C7

Di-muon mass spectrumLarge theoretical uncertainties

SUSY 1 & 2

SM w/uncert.

Estimation with reoptimized detector & trigger simulation:

Bd mass resolution √S resolutionIntegrated on whole di-muon mass spectrum

BA resolutionFor Forward-Backward asymmetry measurement

4400 BdK*0

Precise measurements possible if enough statistics

Interesting area for New Physics reach

1999 TDR results: 1.5 year @ low lum, ancient detector layout….

… but small modifications expected with initial layout (~15% worse)

Expected mass spectra for 30 fb-1

1400 BdK*0

=50 MeV/c2

Comparison

Int. lumi.

20 fb-1

2 fb-1

100 fb-1

S/√B

High Lum.estimation

Expected results after one year of running:

…New Physics evidence only if C7eff>0

Precise AFB measurements possible but…

Only for LHCb

Partial semi-inclusive branching ratios could give theoretically clean constraint on CKM matrix parameters (Eur.Phys.J. C8 (1999) 619-629):

√R ~

Experimentally accessible to LHCb a good accuracy could be

obtained after 5 years of running

Old LHCb geometry

ſB(BXdll

ſB(BXsll

1+o(1)R =

1. Presentation

2. Not so rare: BX

3. Rare: BX

4. Very rare: B+-

5. Conclusions

Physics & experimental interest

•Very-rare decay (10-9, 10-10):

large New Physics effects possible

•Very clean signature even at high-luminosity observable with a sufficient amount of bb pairs

•Current experimental limits:

Br(Bs) < 9.5x10-7 (CDF)

Br(Bd) < 1.6x10-7 (Belle)

17 Bs120 background events

Analysis using reoptimized detector:

ATLAS/CMS

CMS background rejection significantly better

Estimations for one year @ 1034cm–2s-1 (100fb-1) (1999 TDR results):

92 Bs14 Bd660 background events

26 Bs 4 Bd

6 background events

Comparison

Int. lumi.

100 fb-1

2 fb-1

100 fb-1

S/√B

Results after one year of running at high luminosity:

Difference between ATLAS & CMS due to:

•Better resolution on muon impulsion•Calo isolation not yet implemented in ATLAS

1. Presentation

2. Not so rare: BX

3. Rare: BX

4. Very rare: B+-

5. Conclusions

After one year of LHC (2008):

Œ Significant statistics in BX and BX (ATLAS/CMS & LHCb) First precision measurements (AFB & ACP for BX, ACP for BX,…) (ATLAS/CMS & LHCb)Ž First evidence of B ? (ATLAS?/CMS)

Conclusion

What could we expect?

At LHC high luminosity era (2008…):

Œ & to be continued in LHCb & ATLAS/CMS (except BX in ATLAS/CMS) Ž Precise observation of B (CMS, ATLAS & LHCb)

Thanks to S.Amato, G.Pakhlova, P.Koppenburg, N.Nikitin, L.Silvestris & S.Sivoklokov

Backup Material

B2 6th International Conference on Hyperons, Charm and Beauty Hadrons S. Viret

BK*FB asymmetry measurement will give C7

eff sign in any case.

Difference is not model dependent

6 th International Conference on Hyperons, Charm and Beauty Hadrons July 2, 2004 Rare B Decays at...

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