Rare B decays in ATLAS and CMS
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1 Rare B decays in ATLAS and CMS University Dec. 14 th 2006 Makoto Tomoto Nagoya University on behalf of CMS and ATLAS collaborations
2 Makoto Tomoto (Nagoya University) Outline B physics in ATLAS and CMS ATLAS and CMS detectors B µµ B Xµµ Conclusion
3 Makoto Tomoto (Nagoya University) B physics in ATLAS and CMS ATLAS and CMS p-p collision at s = 14TeV σ(bb) = 500 µb B d B d : B + B - : B s B s : b-barions = 4:4:1: bb L=10 33 cm -2 s -1 B-factory as well as New particle-factory Detector design is dedicated high-p T physics Majority of B-events is low-p T particles Trigger and analysis are a challenge B-decays to µ s are promising Strategy on B-physics in ATLAS and CMS CP violation (Low luminosity run) B s oscillation (Low luminosity run) Rare B decay (Even in High lumi.) (B µµ, B K*µµ, Λ b Λµµ)
4 B µ + µ and b sll Sensitive to new physics SUSY, Higgs etc. FCNC transition Forbidden at tree diagram Br(B µµ) B s µµ B d µµ SM CDF (780 pb -1 ) %CL DØ (700 pb -1 ) Belle 78 fb -1 - BaBar 111 fb %CL SM: Br(b sll) ~ 10-6 ~ 10-7 Br(B d K*µµ) measurements Belle : x Babar : x 10-6 V ts and V td determination Wilson coefficient C 7, C 9, C 10 Makoto Tomoto (Nagoya University) Rare B decays %CL %CL % CL % CL B s µ + µ tanβ=50 B s µµ B d µµ B sll
5 Makoto Tomoto (Nagoya University) LHC 27Km ring, proton-proton collider, s=14tev 4 experiments in LHC LHCb dedicated B-physics ALICE dedicated heavy ion Two general purpose detectors: CMS and ATLAS Operation plan - End of 2007: 900 GeV commissioning run - After summer 2008: 14TeV, Low luminosity run (L = cm -2 s -1 ) -Design: 14TeV, High luminosity run (L = cm -2 s -1 ) ATLAS LHC 27Km tunnel CMS
6 Makoto Tomoto (Nagoya University) Detectors Compact Muon Solenoid Total weight : T Overall diameter : 15.0 m Overall length : 21.5 m Magnetic Field : 4 Tesla A Toroidal LHC ApparatuS Total weight : 7000 T Overall diameter : 22.0 m Overall length : 46.0 m Magnetic Field : 2 Tesla (solenoid) 0.5 Tesla (toroid)
7 Inner Detectors To reconstruct vertex of B decays Used in HLT, better ID of B events Impact parameter significance ATLAS: Pixel, SCT, TRT in 2 T solenoid field Makoto Tomoto (Nagoya University) CMS: Pixel, Silicon tracker in 4 T solenoid field
8 Impact Parameter Resolution Impact parameter Mµµ Mass Resolution σ(d0) (µm) IP resolution for ATLAS Final detector Impact par resol Final Detector Layout Impact par resol TDR Detector Layout ATLAS pt>6gev 25-70µm B-decay tracks in Bs-Dsπ CMS B-decay trakcs pt>3-6gev in B-µµ 50-90µm p T - range for muons form B µµ CMS σ=36mev (4Tesla) 50 η< pt (GeV) All η σ=84mev (2Tesla) η <0.7 η >1.2 Makoto Tomoto CMS (Nagoya University) ATLAS ATLAS
9 Makoto Tomoto (Nagoya University) Muon detectors For trigger and offline selection to get pure rare B-decay samples ATLAS: RPC (barrel) and TGC (endcap) for LVL1 trigger CSC and MDT for precise tracking in 0.5 T toroid field RPC 3 RPC 2 RPC 1 low p T MDT MDT high p T TGC EI MDT M D T TGC 2 TGC 1 M DT TGC 3 low p T Tile Calorimeter TGC FI M DT high p T XX-LL01V m CMS: RPC (barrel) for LVL1 trigger CSC and DT for precise tracking in 2 T solenoid field
10 Muon detectors Cosmic ray run with real muon detectors! ATLAS CMS ATLAS Barrel muon CMS Barrel muon ATLAS Endcap muon Makoto Tomoto (Nagoya University) CMS CKM2006 Endcap at Nagoya muon
11 ATLAS/CMS Trigger System For rare B-decays, di-muon trigger is used 40MHz <2.5 µs Hardware ~100kHz HLT ~1-2 khz out ~10 ms Software ~100 Hz out ~1 s Makoto Tomoto (Nagoya University) Region of Interest (RoI ): HLT reconstruct b-decays using partial reconstruction in RoI around L1 muon ~150Hz
12 ATLAS LVL1: 6GeV Not normalized B µ + µ - ATLAS 10GeV di-muon trigger CMS LVL1: 1/2 B K * µ + µ - LVL1: 2µ RoI p T (µ) > 6GeV (~500 L=10 33 cm -2 s -1 ) singleµ diµ p T >3GeV ATLAS LVL2: Confirm each m RoI from LVL1 Mass cut Online di-µ mass, (MeV) B µµ : 4 GeV < M(µµ)< 6 GeV ATLAS EF: Refit ID tracks in Level-2 RoI Decay vertex reconstruction Transverse Decay length cut: L Makoto xy > 200µm Tomoto (Nagoya University) CMS HLT: p T (GeV) Primary vertex reconstruction - use three most probable vertices Regional track reconstruction - partial reconstruction with 6hits -Pt > 4 GeV Track pairs - mass windows for signal - (un)like sign charge Vertex fit - χ 2 <20 & Decay flight length > 150µm
13 Makoto Tomoto (Nagoya University) CMS offline analysis : B µµ l xy /σ xy isolation χ 2 COSα
14 Makoto Tomoto (Nagoya University) ATLAS offline analysis : B s µµ M mm = M Bs MeV isolation: no charged tracks with p T > 0.8 GeV in cone θ < 15 degrees vertex fit with pointing to primary vertex constraint transverse decay length L xy /s(l xy ) > 11 Exected signal v.s. inclusive bb µµx bkg B 0 s signal BG (bb µµx) p T >6 GeV, R µµ < events events M µµ cut Isolation cut L xy /σ>11, χ 2 < < All cuts
15 Projected upper limits : B s µµ 7 signals and 20 backgrounds can expect upper limit on Br(B s µµ) Br ( 0 + B µ µ ) s N 2σ ( n, n ) Bs bg αε total Single experiment expects to reach the sensitivity of SM prediction 3 years of data taking : L=30fb -1 Tevatron projection ATLAS/CMS expectation Still factor of 10 above Makoto Tomoto (Nagoya University) Both ATLAS and CMS has proven to continue measurement of B s µµ at nominal LHC luminosity This will mean 100 fb -1 CKM2006 just in one at Nagoya year.
16 Specific background study : B s µµ BG process Br Effective Br in B signal region B 0 - µ + µ ~10-4 ~ B + µ + µ - + < < B c µ + µ - + B 0 d 0 µ + µ - B 0 s µ+ µ - B d K B s KK Number of events B 0 s µ+ µ - B 0 d < 10-4 ~ ~ µ+ µ- < 10-8 ~ ~ < 10-9 Number of events Much high branching ratio compared to Br(B s µµ)=10-9 Generator level study Taking into account 1. π/k µ fake rate ~ % 2. soft ν phase space ~ 10% Needs further study with full simulation B + µµlν Fake events from B 0 d - + Mµµ Makoto Tomoto (Nagoya University) CKM2006 Mµµ at Nagoya
17 B Xµµ BR used in the MC Signature after trigger + offline reconstruction 30 fb -1 Models used in MC or to confront experimental sensitivities. Signal Bkg B d K 0* µµ B + Κ + µµ B s φ µµ Br.fraction µµ-mass A FB <50000 <10000 <10000 Melikhov, Nikitin, Simula, PRD57,98; Melikhov, Stech, PRD62, 2000 WC: SM Buras, Munz, PRD52, 95; MSSM Cho, Misiak,Wyller, PRD54, Λ b Λµµ 800 < 4000 NP: Chen, Geng, PRD64,2001 Aliev NPB649,2003 Events Λ b mass Λ b mass M. Biglietti Entries et al (ATLAS Coll.) Nucl. Phys B 156 (2006) RMS N e+004 ± 1252 µ ± 0.1 σ ± 0.53 N e+004 ± 1148 σ ± 0.73 ε = 25% σ= 21.5 MeV Mass, (MeV) Mass (MeV) Makoto Tomoto (Nagoya University) Forward-backward Asymmetry (A FB ) B µ µ + Λ ATLAS statistical error<5% experimetal points <A FB > simulated events with SM simulated events with positive MSSM C 7γ eff
18 Makoto Tomoto (Nagoya University) Conclusion ATLAS and CMS sensitivity to rare B-decay is expected to reach the level of SM prediction after 3 years of data taking b µµs and B µµ promising for new physics We will directly and indirectly be able to search for new physics at the same place and time At LHC nominal luminosity cm -2 s -1, ATLAS and CMS can make a measurement of B s ->µµ branching ratio just after one year. More study using full simulation/reconstruction is under way The installation and commissioning of the detectors are in good progress Everyone is waiting for the data taking
19 Makoto Tomoto (Nagoya University) Backup or Old slides
20 FCNC transition Forbidden at tree level Br(b sll) ~ 10-6 ~ 10-7 Br(B µµ) ~ 10-9 ~ Indirect search for new physics SUSY, Higgs etc For b sµµ transitions V ts and V td determination Wilson coefficient C 7, C 9, C 10 tanβ=50 B s µµ B d µµ Rare B-decays B s µ + µ Makoto Bobeth et. Tomoto al., PRD66 (Nagoya (2002) BaBar 111 fb-1 - University) B s µµ B d µµ SM CDF (780 pb-1) %CL DØ (700 pb-1) Br(B d K*µµ) Belle : x 10-6 Babar : x 10-6 Belle 78 fb %CL B sll %CL %CL % CL CKM % CL at Nagoya
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