Status of LHCb the beauty experiment Outline LHCC

Status of LHCb (the “beauty” experiment) Outline: LHCC open session Ø Introduction 17 February 2010 Ø Detector Performance Ø Physics Results and Prospects Physics at LHC Perugia, 6 -11 June 2011 Andreas Schopper Member countries of the LHCb Collaboration: 730 members 15 countries 55 institutes on behalf of the Collaboration

LHC(b) physics goals Search for deviations from Standard Model predictions due to virtual contributions of new heavy particles in loop processes Box diagram Penguin diagram ? ? New Physics measure: Ø CP violating phases in mixing and decay Ø Rare Decays of heavy quarks compare: Ø to very precise predictions of the SM discovery potential for New Physics extending to mass scales far in excess of the LHC centre-of-mass energy 6 June 2011 PLHC 2011 Bs μ+μ- “s-channel penguin” ? Andreas Schopper 1

Example of search for New Physics in Bd, s μ+μü in SM: B(BS μ+μ-) = (3. 2 ± 0. 2)∙ 10– 9 ü sensitive to many NP models preferred values of tanβ vs MA plane MSSM: Øjets Øjet + μ ØJet + e NUHM 1: (Non-Universal Higgs Mass) Ø best fit contours in tanβ vs MA plane [O. Buchmuller et al, ar. Xiv: 0907. 5568] Ø CMS direct search (5σ) contours 30 or 60 fb-1 H, A → τ+ τ- [ar. Xiv: 0704. 0619] Ø indirect limit from BR Bs μ+μ- very discriminative Ø distinguish between different models by measuring ratio B(Bd μ+μ-)/B(Bs μ+μ-) Ø SM uncertainty ~5% 6 June 2011 PLHC 2011 Andreas Schopper 2

Why doing flavour physics at LHC? LHC is a b-factory! ü bb-pairs produced with high cross-section at LHC energy Bq b 12 32 -2 -1 (10 bb produced in 2 years at L=2· 10 cm s ) Bq b ü all species of particles containing a b-quark are produced (Bu+, Bu-, Bd 0, Bc+, Bc-, Bs 0, Λb , etc. ) Ø bb-pair production is strongly correlated and sharply peaked forward-backward detector with forward geometry with unique 2 < η < 6 coverage Ø B decays have long flight-distance ~1 cm (allowing to distinguish B-decays from other background decays, and essential for time-dependent CP violation measurements) B-decay Big challenge to select displaced vertex events of interest: K ü σbb is less than 1% of total ~1 cm K inelastic cross section D K Bs s ü B decays of interest + typically have BR < 10 -5 B btag Ø Need high statistics and B-production high selectivity! at pp-collision primary vertex 6 June 2011 PLHC 2011 Andreas Schopper 3

The LHCb Detector optimized for hadronic environment ~1 cm B Specific to LHCb! RICH Detectors h Muon System Interaction Point Demonstrated performance of LHCb confirms that concept is working proton beam Locator Event. Vertex display VELO (view from top) movable device 7 mm from beam! 0 6 June 2011 Tracking System 10 m PLHC 2011 Calorimeter System 20 m Andreas Schopper 4

LHC(b) operation in 2010 Outstanding machine performance thanks to our LHC colleagues!!! Peak luminosity evolution with time: Ø peak luminosity increased within ~1 month by factor 100! (L~1030 to 1032 cm-2 s-1) Ø for LHCb reached almost nominal L (L=1. 6· 1032 cm-2 s-1, nominal 2· 1032 cm-2 s-1!) Lmax=1. 65· 1032 cm-2 s-1 6 June 2011 PLHC 2011 ~1 month Andreas Schopper 5

LHC(b) operation in 2010 Evolution of average number of visible pp-collisions per bunch crossing: L = nb · L b nb · μ Lb LHCb design: 1 beam nb L = 2 · 1032 ; nb ~ 2600 <μ> ~ 0. 4 beam Ø maximizes fraction of 2 single interaction bunch crossings μ=1 B-decay displaced vertex K Bs Ds B pp-collision primary vertex 6 June 2011 PLHC 2011 btag Andreas Schopper K K 6

LHC(b) operation in 2010 Evolution of average number of visible pp-collisions per bunch crossing: L = nb · L b nb · μ LHCb design: L = 2 · 1032 ; nb ~ 2600 <μ> ~ 0. 4 Ø maximizes fraction of μ=2. 7 single interaction bunch crossings 2010 pp interactions/crossing 2010 run: L=1. 6 · 1032 ; nb = 344 μmax = 2. 7 Ø > 6 times nominal! 6 June 2011 design μ=0. 4 PLHC 2011 Andreas Schopper 7

High multiplicity events Ø high track multiplicity and many vertices in each collision event Lb Ø big challenge for detector operation, trigger, reconstruction and analysis nb typical event at μ~2. 5 μ = 231 B-decay displaced vertex Bs pp-collision primary vertex 6 June 2011 PLHC 2011 B K K K Ds btag Andreas Schopper 8

Detector & trigger efficiencies Level -0 40 MHz L 0 e, L 0 had L 0 2010 HLT 1 30 k. Hz Global reconstruction ~3 very high selection efficiencies! 6 June 2011 PLHC 2011 High p. T track with nonzero Impact Parameter Inclusive selections , +track, , topological, charm, ϕ HLT 2 all detector components ~ 99 % efficient! High-Level Trigger ≤ 1 MHz & Exclusive selections k. Hz Storage: “nominal” event size ~35 k. B Andreas Schopper 9

LHCb performance in 2010 HV VELO 0, 8% 2, 3%DAQ 4, 9% Deadtime 1, 7% - All detectors in data taking - HV powered on all detectors - VELO fully closed - Triggers accepted Running 90, 3% Ø ~37 pb-1 integrated luminosity Ø with all sub-detectors fully operational Ø overall data taking efficiency of ~90%! 6 June 2011 PLHC 2011 Andreas Schopper 10

Expected integrated luminosity for LHCb in 2011 Introduced luminosity leveling for LHCb can run at optimal μ and Lmax GPD luminosity falls-off exponentially Luminosity of LHCb levelled continuously LHCb design luminosity Since end of May running at constant L ~ 3∙ 1032 cm-2 s-1 with μ ~ 1. 5 6 June 2011 PLHC 2011 Andreas Schopper 11

Expected integrated luminosity for LHCb in 2011 Introduced luminosity leveling for LHCb can run at optimal μ and Lmax ! d de -1 b p 0 1 or c e r 2 ~ y ad e lr A LHCb expects to collect ~1000 pb-1 in 2011 (and ≥ same in 2012) 6 June 2011 PLHC 2011 Andreas Schopper 12

Detector performance: mass resolution Detection of different B species: for B J/ψ X with 34 pb-1 ~ full statistics of 2010 Bu+ J/ψ K+ Bd 0 J/ψ K* σ~11 Me. V Λb 0 J/ψ Λ σ~9 Me. V 6 June 2011 Bs 0 J/ψ φ σ~8 Me. V σ~7 Me. V Ø very good mass resolution Ø very low background (comparable to e+e- machines) Ø worlds best mass measurements Channel Comparison GPDs: v CMS: σ~16 Me. V v ATLAS: σ~26 Me. V [LHCb-CONF-2011 -027] LHCb mass [Me. V/c 2] PDG [Me. V/c 2] 5279. 17 ± 0. 29 5279. 50 ± 0. 30 5366. 30 ± 0. 60 5620. 2 ± 1. 6 6277 ± 6 PLHC 2011 Andreas Schopper 13

Detector performance: proper-time resolution Vertex resolution on primary vertex Bu+ J/ψ K+ Bd 0 J/ψ K* Bs 0 J/ψ φ Λb 0 J/ψ Λ Ø excellent proper time resolution of ~50 ps Channel 6 June 2011 LHCb lifetime [ps] PLHC 2011 PDG [ps] 1. 638 ± 0. 011 1. 525 ± 0. 009 1. 477 ± 0. 046 1. 391 ± 0. 038 Andreas Schopper [LHCb-CONF 2011 -001] 14

Detector performance: hadron PID performance Kaon identification efficiency and miss-identification as function of momentum Λb p π Λb p K 35 pb-1 Ø excellent prospects for observation of CP violation with L~1 fb-1 6 June 2011 PLHC 2011 Andreas Schopper 15

Detector performance: Particle Identification on B hh No particle identification any 2 hadrons! particle identification of 2 Kaons (35 pb-1) B s 0 K + K - B 0 h+ hlarge width particle identification of 2 π BR(B π+π-) = 5 x 10 -6 ! B d 0 K π & B s 0 K π particle identification of 1 π and 1 K (will get as many Kπ in <1 fb-1 as Belle in 1000 fb-1) Bd 0 π+ π229± 23 events in 35 pb-1 Expectations 2011: LHCb: 6500 ev. /fb-1 (CDF: 1100 ev. /fb-1) 6 June 2011 PLHC 2011 Andreas Schopper 16

Detector performance: photon PID Bd 0 K* γ π0 reconstruction performance no conversion σ~10. 5 Me. V 1γ conversion σ~13. 5 Me. V χ c J/ψ γ cross section ratio χc 2 / χc 1 for prompt χc production at √s = 7 Te. V [LHCb-CONF-2011 -020] 6 June 2011 PLHC 2011 Andreas Schopper 17

Detector performance: muon PID Differential J/Ψ production cross section vs p. T Muon ID efficiency measured with ‘tag & probe’ technique: ε=0. 9798(6) [Eur. Phys. J. C 71(2011)1645] Differential Y(1 S) production cross section vs rapidity Y 1 S Y 2 S Y 3 S [LHCb-CONF-2011 -016] 6 June 2011 PLHC 2011 Andreas Schopper 18

High bb-cross section confirmed bb-cross section at √s = 7 Te. V from semileptonic B decays x un-triggered single-μ trigger + average error on theory From B 0 D 0 X+ - with Do K- π+ total bb cross-section in 4π: In perfect agreement with result from B J/ψ X: [Physics Letters B 694 (2010) 209] [Eur. Phys. J. C 71 (2011) 1645] Thanks to its excellent detector performance, with ~37 pb-1 LHCb is already competitive with Tevatron results based on 6000 pb-1, even though bb cross-section only 3 times higher 6 June 2011 PLHC 2011 Andreas Schopper 19

Towards LHCb Core Physics with 2010 data CP violation Ø prospects for measuring angle γ ü trees ü loops Ø direct CP violation (B → Kπ) Ø mixing induced CP violation (Фs) Rare decays Ø Bs → K*μμ Ø Bs → μμ LHCb as General purpose detector Ø electroweak physics And many more! see plenary talks by Marta Calvi & Giulia Manca Ø Charm, Spectroscopy, Onia …. And many parallel sessions for details…. 6 June 2011 PLHC 2011 Andreas Schopper 20

Determination of CKM angle Ø All measurements together (trees & loops) determine “indirectly” the CKM angle = (67 ± 4)º 6 June 2011 PLHC 2011 Andreas Schopper 21

Determination of CKM angle Ø However, processes involving loops may be affected by New Physics should compare measurements from loop processes with tree processes only! Ø But γ from trees only poorly constrained: = (73 +22 -25)º (direct measurement) 6 June 2011 PLHC 2011 Andreas Schopper 22

Determination of CKM angle Ø However, processes involving loops may be affected by New Physics should compare measurements from loop processes with tree processes only! Ø But γ from trees only poorly constrained: = (73 +22 -25)º (direct measurement) Ø Compare with loops only room for New Physics ü measure γ precisely from tree decays only and compare to loop decays ü access interference effects involving the phase between Vub and Vcb 6 June 2011 PLHC 2011 Andreas Schopper 23

Prospects for in trees from Bs Ds. K ü 2 time dependent asymmetries from 4 decay rates: Bs (Bs) Ds- K , Ds+ K ü 2 tree decays (b→c) and (b→u) of same magnitude interfere via Bs mixing: large interference effects expected insensitive to new physics ng i x mi s Vub Bs + Bs D- s K+ Vcb Vub b u transition, phase + b c transition, phase 0 Vcb Fit the 4 tagged, time-dependent rates: ü phase of D s K = ( s) extract both and ( s) with s being determined using Bs → J/ Ø Bs Ds. K final state under study Ø expect world’s first time-dependent analysis with 2011 data Ø first step: measurement of Δms with Bs Ds π 6 June 2011 PLHC 2011 Andreas Schopper 24

Measurement of Δms from Bs Ds π With 2010 data large signals for Bs Ds π useful for Δms measurement Bs 0 Ds- ( π-) π+ Bs 0 Ds- (K*K-) π+ Bs 0 Ds- (K+K- π-) π+ Bs 0 Ds- 3π World average Δms = (17. 77± 0. 10± 0. 07) ps 1 6 June 2011 Mixing asymmetry for Bs 0 as function of proper time modulo 2π/Δms [ps] Δms = (17. 63± 0. 11± 0. 04) ps-1 PLHC 2011 [LHCb-CONF-2011 -020] Andreas Schopper 25

Prospects for in trees from B± DK± Ø based on Gronau-London-Wyler & Atwood-Dunietz-Soni method Ø [Phys. Lett. B 270, 75 (1991) ; Phys. Rev. Lett. 78, 3257 (1997)] measure relative rates of B- → D(Kπ) K- and B+ → D(Kπ) K+ ü two interfering tree B-diagrams, one colour-suppressed ü two interfering tree D-diagrams, one Double Cabibbo-suppressed Vcb colour-allowed u d } s D 0{ cu u }K Cabibbo-favoured Vub colour-suppressed u s }K d D 0{ cu u } Double Cabibbo-suppressed Add further D-decays: Ø D → Kπππ (Cabibbo favoured + DCS decay) Ø D → KK (CP eigenstate) Weak phase diff. : Magnitude ratio: r. B Strong phase diff. : d. B Magnitude ratio: r. DK Strong phase diff. : d. DK 34 pb-1 B+ D(Kπ) K+ (Cabibbo allowed D-decay) combine B+ DK+, B 0 DK*0, Bs Ds± K± σ(γ) ~ 5ο with 2 fb-1 from 2011/2012 data 6 June 2011 PLHC 2011 Andreas Schopper 26

Prospects for in loops from B and Bs K K Ø large penguin contributions in both decays sensitive to New Physics Bd 0 /K π+ 275± 24 events in 37 pb-1 Bd/s /K B s 0 K + K - πBd/s /K 333± 21 events in 37 pb-1 /K Ø measure time-dependent CP asymmetry for B and Bs K K ü ACP(t) = Adir cos(Δmt) + Amix sin(Δmt) ü Adir and Amix depend on γ, mixing phases, and ratio of penguin to tree = d eiθ Ø exploit “U-spin” symmetry (d s) [R. Fleischer, Phys. Lett. B 459, 306 (1999)] ü dππ = d. KK and θππ = θKK 0 ü 4 measurements and 3 unknowns, if mixing phases taken from B J/ KS and Bs J/ Expected sensitivity for γ in loops σ(γ) ~ 5° with 2 fb-1 from 2011/2012 data 6 June 2011 PLHC 2011 Andreas Schopper 27

First observation of Bs K*K* With increased statistics (also upgrade) measure time dependent CP asymmetries in penguin decays of Bs K*K* and Bs → ФФ Bs K*K* Bd K*K* [LHCb-CONF-2011 -019] 6 June 2011 PLHC 2011 Andreas Schopper 28

Direct CP violation in B 0 d, s K π Bs 0/Bd 0 yield = (10. 7± 2. 0)%, Bd 0 K π & B s 0 K π ACP(Bd 0) = (-7. 4 ± 3. 3 ± 0. 8)% [HFAG: (-9. 8 ± 1. 2)%] ACP(Bs 0) = (15 ± 19 ± 2)% [CDF: (39 ± 15 ± 8)% in 1 fb-1] B 0 Bd 00 K++ π-Bs π K [LHCb-CONF-2011 -011] Bd 00 K-- π++ Bs π K B s 0 6 June 2011 PLHC 2011 Andreas Schopper 29

Mixing induced CP violation in Bs J/Ψ Ф ü mixing phase very precisely known in Standard Model: s = – 2βs = – 0. 0363± 0. 0017 ≈0 Bd, s 0 ü sensitive to New Physics effects ≈0 +NP? Bd, s 0 Ø s = s(SM) + s(NP) Bs J/ψ ϕ : [LHCb-CONF-2011 -002] ηf = +, - 1 CP eigenstates J/ is not a pure CP eigenstate: ü 2 CP even, 1 CP odd amplitudes contributing ü need to fit angular distributions of decay final states as function of proper time (external ms) ü requires very good proper time resolution 6 June 2011 PLHC 2011 Andreas Schopper 30

Mixing induced CP violation in Bs J/Ψ Ф ü mixing phase very precisely known in Standard Model: s = – 2βs = – 0. 0363± 0. 0017 ≈0 Bd, s 0 ü sensitive to New Physics effects ≈0 +NP? Bd, s 0 Ø s = s(SM) + s(NP) Intriguing results by Tevatron (note: s = – 2βs) 6 June 2011 PLHC 2011 Andreas Schopper 31

Mixing induced CP violation in Bs J/Ψ Ф [LHCb-CONF-2011 -006] 2010 data 2010 36/pbdata SM Simulation of expected precision with 200 pb− 1 Ø expect σ(Фs) ~ 0. 2 -0. 3 rad with 200 pb− 1 Further improvements expected with full 2011 data set: ü ~30 times larger sample than 2010 ü improved ‘opposite side tagging’ (present εD 2 = 2. 2 ± 0. 5%) ü including ‘same-sign’ kaon tagger 6 June 2011 PLHC 2011 Andreas Schopper 32

Mixing induced CP violation using other Bs decays With more statistics (also in view of upgrade): Ø add pure CP states: Bs J/ψ f 0 and Bs → Ds+ Ds- no need for angular analysis Ø reduce SM uncertainties due to (suppressed) penguin contribution by using Bs J/ψ K* and penguin-free Bs → D 0 Ф decays [S. Faller et al, Phys. Rev. D 709 (2009) 014005; K. De Bruyn et al, ar. Xiv: 1012. 0840] [R. Fleischer, Nucl. Phys. B 659 (2003) 321] First observation of Bs J/ψ f 0 First observation of Bs J/ψ K* f 0 resonance: |M(π+π–) – 980 Me. V | < 90 Me. V [LHCb-CONF-2011 -025] BS J/ψ f 0(980) 33 pb-1 [Phys. Lett. B 698 (2011) 115] 6 June 2011 PLHC 2011 Andreas Schopper 33

Very rare decays: search for Bd, s μ μ SM Bd, s μμ the super rare loop decay In Standard Model: B(Bd μ μ) = (0. 10 ± 0. 01) 10– 9 B(Bs μ μ) = (3. 2 ± 0. 2) 10– 9 [A. J. Buras: ar. Xiv: 1012. 1447] ü sensitive to New Physics, can be strongly enhanced in SUSY with scalar Higgs exchange ü sensitive probe for MSSM with large tanβ: B(BS μ+μ-) ~ tanβ 6 / MA 4 MSSM +NP? Ø entering interesting regime with limits of B(Bs μ μ) < 10 -8 6 June 2011 PLHC 2011 Andreas Schopper 34

Very rare decays: search for Bd, s μ μ LHCb: ü form geometrical likelihood (GL) out of discriminant variables ü look for enhancement in GL vs mμμ space Ø data driven analysis Ø B → hh sample particularly valuable given its identical topology to signal mode B→hh background B(Bs μμ) < 5. 6 10– 8 ; B(Bd μμ)<1. 5 10– 8 (95% CL) [Phys. Lett. B 699 (2011) 330] expected sensitivity 10 -8 Most sensitive region will enter the 10 -9 regime this year! 10 -9 current result 6 June 2011 end 2012 PLHC 2011 Andreas Schopper 35

Rare decays: prospects for B 0 K*0μ+μ- Ø suppressed decays ( B=1 FCNC), SM BR ~ 10– 6 Ø forward-backward asymmetry AFB(s) in the restframe is a sensitive probe of New Physics [A. Ali et al. , Phys. Lett. B 273, 505 (1991)] B+ K+ μ+μB 0 K* μ+μ- Ø zero point can be predicted at LO with no hadronic uncertainties, known at 5% level in SM, sensitive to NP via non-standard values of Wilson coefficients with 1 fb-1 LHCb expects ~1000 events Ø zero crossing point in SM: s 0 = (4. 36+0. 36 -0. 33) Ge. V 2 Ø measure s 0 to 0. 4 Ge. V 2 in 2 -3 years 6 June 2011 PLHC 2011 Andreas Schopper 36

LHCb as a “General Purpose Detector” Specific feature of LHCb: ü particle detection in the forward region (down to beam-pipe) ü particle identification capability in particular for hadrons due to RICH detector ü precise vertexing 6 June 2011 PLHC 2011 Andreas Schopper h 37

Production of Z and W in forward direction LHCb preliminary (16 pb-1) Z 0 μ+μq + Z q - Ge. V LHCb preliminary (16 pb-1) W±→μ ± νμ Ø provides information on the Parton Distribution Functions 6 June 2011 W+ W+/- (fit) τ (rel. W) Z (MC) QCD (fit) W- PLHC 2011 Andreas Schopper 38

W+ W- cross-section asymmetry Production of Z and W in forward direction (16 pb-1) [LHCb-CONF-2011 -012] acceptance for ATLAS & CMS production cross-section σ + LHCb data theory prediction [pb] W/Z ratios test SM at 6% 6 June 2011 PLHC 2011 Andreas Schopper 39

Outlook: Upgrade LHCb to 40 MHz readout Limitations of current detector: yields for hadron decays saturate at luminosities above ~3∙ 1032 since p. T cuts at L 0 trigger must be raised to stay within 1 MHz R/O limit Baseline for LHCb upgrade: ü increase luminosity to L ≥ 1033 cm-2 s-1 ü upgrade readout electronics and DAQ architecture to 40 MHz to full software trigger ü increase signal yields by factor ~5 for muonic and ~7 for hadronic channels Bs→J/Ψ(μμ)Ф decays with hadrons collect 5 fb-1 per year with much increased efficiency for hadronic final states Submitted upgrade LOI to LHCC beginning of March: [CERN-LHCC-2011 -001] physics case well received! 40 MHz architecture under review at present aim: produce TDRs in time for installing the detectors & electronics in 2018 (LS 2) 6 June 2011 PLHC 2011 Andreas Schopper 40

LHCb sensitivities to key channels [CERN-LHCC-2011 -001] LHCb 6 June 2011 PLHC 2011 upgrade Andreas Schopper 41

Summary & Conclusion Ø LHCb has demonstrated with its 2010 data ü excellent detector performance ü ability to work in a hadronic environment very efficiently ü competitive physics results with B-factories and Tevatron Ø LHCb perspectives for 2011 ü collect 1 fb-1 by end of the year ü produce world-class measurements in CP violation (e. g. Фs) and rare decays (e. g. Bs μμ) already by summer this year ü search for New Physics with unprecedented precision, in particular in the Bs system Ø LHCb outlook ü collect ~5 fb-1 by 2018 ü upgrade detector to accumulate 5 fb-1/year with flexible software trigger exciting times ahead of us! 6 June 2011 PLHC 2011 Andreas Schopper 42

LHCb related talks at this conference Plenary Ø B decays, CKM, spectroscopy B and Charm at LHCb - Marta Calvi Ø Onia results from LHC - Giulia Manca Parallel session on B, Charm and Onia Ø Search for New Physics with rare decays of B and Bs mesons at LHCb - Johannes Albrecht Ø Mixing and CP violation in the Bs system at LHCb - Greig Cowan Ø CP-violation measurements and prospects with hadronic B decays at LHCb - Lars Eklund Ø CP-violation studies with charm decays at LHCb - Vladimir Gligorov Parallel session on EW and QCD Ø Studies of electroweak boson production in the forward region with LHCb - Stephen Farry Parallel session on hard QCD and diffraction Ø Exclusive dimuon measurements with LHCb - Valentin Niess And: many LHCb posters !!! 6 June 2011 PLHC 2011 Andreas Schopper 43

Back-up slides 6 June 2011 PLHC 2011 Andreas Schopper 44

Lifetime measurement of Bs K K Ø effective lifetime of Bs 0 K+ K- decay dominated by penguin diagram Ø can receive important NP contributions affecting lifetime difference: ΔΓs = ΓL– ΓH ≅ ΔΓs. SM ∙ cos (ФNP) Ø in the SM: �� ) = 1. 390 ± 0. 032 ps �� +�� − (S�� +NP? [R. Fleischer, R. Knegjens, ar. Xiv: hep-ph/1011. 1096] [LHCb-CONF-2011 -018] Fitting the decay rate with a single exponential an effective lifetime is measured: RL /ΓL+ RH /ΓH CDF: with RL, RH: fraction of L, H states τKK-1 = �� �� +�� −=1. 53± 0. 18± 0. 02 ps RL /ΓL 2 + RH / ΓH 2 in the Bs 0 K+ K- decay, mainly light Most precise measurement by LHCb with 37 pb-1 : τ(Bs 0 K+K-) = 1. 440± 0. 096(stat) ± 0. 010(syst) ps 6 June 2011 PLHC 2011 Ø interesting NP constraints will come with 2011 data! Andreas Schopper 45

CKM Unitarity Triangles Two non-degenerated (normalized) CKM Unitarity Triangles Bd mixing phase: d = 2β = –arg(Vtd 2) Bs mixing phase: s = – 2βs = –arg(Vts 2) Weak decay phase: γ = –arg(Vub) = ( ) 0 1 s s s 6 June 2011 PLHC 2011 Extract angles from decay channels: Bd J/ KS s Bs J/ Ф (loop) Bd ππ , Bs KK (tree) Bu, d D K (tree)-2 s Bs Ds K 2 B d D* Bd , , s is very small in Standard Model Andreas Schopper 46

Mixing induced CP violation using other Bs decays With more statistics (also in view of upgrade): Ø add pure CP states: Bs J/ψ f 0 and Bs → Ds+ Ds- no need for angular analysis Ø reduce SM uncertainties due to (suppressed) penguin contribution by using Bs J/ψ K* and penguin-free Bs → D 0 Ф decays [S. Faller et al, Phys. Rev. D 709 (2009) 014005; K. De Bruyn et al, ar. Xiv: 1012. 0840] [R. Fleischer, Nucl. Phys. B 659 (2003) 321] First observation of Bs ψ(2 s) Ф First observation of Bs J/ψ K* [LHCb-CONF-2011 -025] BS ψ(2 s) Ф 36 pb-1 [LHCb-CONF-2011 -014] 6 June 2011 PLHC 2011 Andreas Schopper 47