LHCb Physics and prospects. Stefano Perazzini On behalf of LHCb Collabora4on MENU nd June 2010
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1 LHCb Physics and prospects Stefano Perazzini On behalf of LHCb Collabora4on MENU nd June 2010
2 Physics: OUTLINE Flavor physics and CPV in the quark sector Search for New Physics The LHCb Experiment The detector Data taking in run Core analyses and prospects for
3 Flavor physics in quark sector CC = g d ( 2 u c t )γ µ V CKM s + h.c. b L int Interacting (flavor) eigenstates are mixtures of mass eigenstates described in the SM by the CKM matrix V ud V us V ub V CKM = V cd V cs V cb V td V ts V tb New particles in loop diagrams may modify measured quantities related to V CKM elements b b q V tb V tq V tb u,c,t u,c,t u,c,t V * tx V * tq V * tb x y z q b b b q?? x y z q b Measure differences in the behaviour of particles under CP transformation Look for discrepancy with respect to prediction Stefano Perazzini - MENU2010 3
4 Status of the Art Good agreement from all measurements Still open windows to NP corrections at 10-20% σ(γ) ~ B s mixing phase 0 Rare decays: B s µ + µ - : BR not measured (sensi4ve to NP) B d K*µ + µ - : not clear measurements status Charm sector: mixing induced CP-violation needs more precise measurements 4
5 LHCb Detector bb production (simulation) ~1 cm B Excellent vertexing (high proper time resolution) Excellent tracking (invariant mass resolution) Particle ID (discrimination of various hadrons) Trigger on high ET hadrons and high pt muons (hints of B presence) Stefano Perazzini - MENU2010 5
6 Detector status (I) K S ππ Λ pπ 65 µb µb -1 Ξ Λπ Ω ΛK 6
7 Detector status (II) with PID ϕ KK? ϕ KK! Without PID m(pdg) = ±0.020 MeV 65 µb -1 Peak seen cutting only using Particle ID 7
8 Data Taking Assumed condi<ons in MC studies pre s σ bb L 1 year integrated luminosity 14 TeV 500 µb 2x10 32 cm - 2 s ] - 1 Mainwork about LHCb key measurements (arxiv: v2 [hep-ex]) 2010 expected condi<ons s σ bb σ cc L 7 TeV 500 µb 4.7 mb < 2x10 31 cm - 2 s - 1 Some loss in signal yield due to s=7 TeV Release of trigger thresholds ε trig charm ~ 40-50% Expected 0.1 fb -1 of integrated luminosity 2011 expected condi<ons L close to design value s σ bb σ cc L ε charm trig ~ 10% ε B trig ~ 75-80% 7 TeV 500 µb 4.7 mb ~10 32 cm - 2 s - 1 ε B µx trig > 90% Expected 1 fb -1 of integrated luminosity 8
9 bb produc4on Evaluation of σ bb from ratio between prompt and displaced J/Ψ Combination of invariant mass and pseudo proper-time fits PV Δz µ + µ - t J /Ψ = Δz p z J /Ψ m J /Ψ 800 µb -1 Good B candidates 9
10 J/Ψ produc4on J/Ψ is also important by itself: All models nowadays fail to incorporate cross section and polarization No much data at high pseudorapidity J/Ψ also produced in decay of various charmonium states LHCb has great potential to do measurements in uncovered region of pseudorapidity 10
11 Mixing and CPV in charm Neutral D mixing is nowadays a matter of facts More precise measurements needed for CPV programme No mixing No CPV CPV negligible in the SM window for NP discovery x and y affect precision on CPV measurements A CP ~A M ycosφ - xsinφ 11
12 Mixing and CPV in charm 1. Measure y cp, that means y modified by CPV effects ( ) ( ) 1 y CP = τ D0 K π + τ D 0 h + h y CP = y cosφ D q p 2 1 x sinφ D 2.7x10 6 untagged Kπ 2.6x10 5 untagged KK Measure of A Γ : ( ) τ( D 0 h + h ) ( ) +τ( D 0 h + h ) A Γ (t) = τ D 0 h + h τ D 0 h + h A Γ = q p 2 1 y cosφ x sinφ D D BaBar arxiv: v1 [hep-ex] 1.1x10 5 tagged D* D 0 ( KK)π 12
13 D 0 in 800µb - 1 D 0 Kπ untagged Expected several million of untagged and tagged D fb -1 Δm = m D* -m D D *+ D 0 ( Kπ)π + [tagged D 0 ] m D* -m D < µ Δm ±2σ Δm 13
14 D 0 in 800µb - 1 D 0 KK untagged Expected several million of untagged and tagged D fb -1 Δm = m D* -m D D *+ D 0 ( KK)π + [tagged D 0 ] m D* -m D < µ Δm ±2σ Δm 14
15 Direct CPV in charm D (s)+ K + K - π 800 µb -1 D + K + π - π 800 µb -1 D + K + K - π + : Cabibbo Suppressed decay Penguin loops contributions possible NP effects D s+ K + K - π + & D + K + π - π + : control channels Several 0.1 fb -1 15
16 What about B decays? 16
17 γ from trees Many parameters involved can dilute sensibility to γ R CP ~ 2r B cos(δ B )cos(γ) A CP ~ 2r B sin(δ B )sin(γ) / R CP Need to over constrain the system with various channels 1. GLW (Gronau, London, Wyler): Exploit asymmetries for D 0 decaying to CP-even or CP-odd eigenstates D 0 KK, D 0 ππ Also B 0 D 0 ( hh)k* 2. ADS (Atwood, Dunietz, Soni): Exploit asymmetries for D 0 to flavor specific channel (D 0 Kπ, D 0 Kπππ) 3. Dalitz analysis (Giri, Grossman, Soffer and Zupan): Exploit asymmetries in D 0 K S0 ππ and D 0 K S0 KK σ LHCb ~ 1fb -1 17
18 B s mixing phase Very precisely predicted in SM β s = 0.02 Tevatron measurements give us a hint for NP Golden channel: B s J/Ψ Φ Penguin pollution negligible J/Ψ µµ: very clean signal for LHCb NP? NP? History: Old result: β s = [ 0.10, % C.L. New result: β s = [ -0.1, % C.L. 18
19 B s mixing phase Very precisely predicted in SM β s = 0.02 Tevatron measurements give us a hint for NP Golden channel: B s J/Ψ Φ Penguin pollution negligible J/Ψ µµ: very clean signal for LHCb σ(2β s ) (rad) LHCb has in any case a great potential NP? NP? Intriguing history: Old result: β s = [ 0.10, % C.L. New result: β s = [ -0.1, % C.L. 19
20 B s µµ (Ι) Flavor Changing Neutral Current process BR(B s µµ) = (3.35±0.32)x10-9 [Blanke et al., JHEP 0610:003,2006] Very sensible to NP BR altered from SM prediction arxiv: [hep- ph] < 10-7 < 2x10-8 < 5x10-9 Already at 0.1 fb -1 LHCb can give competitive results 20
21 B s µµ (ΙΙ) LHCb 2010 preliminary Strategy (as at Tevatron): Very loose selection Loooking for signal using a global likelihood method Calibration already started using K S0 π + π - and J/Ψ µ + µ - data MC LHCb 2010 preliminary LHCb 2010 preliminary 21
22 B s µµ (ΙΙ) Trigger must to be as efficient as possible: Calibration with J/Ψ µ + µ - data MC ε data = 82±1 % ε MC = 91 % ε data = 94±3 % ε MC = 96.5 % J/Ψ µ + µ - measured Transoportation to B s µ + µ - p T region P t (µ + +µ - ) [MeV] P t (µ + +µ - ) [MeV] 22
23 B s µµ (ΙΙΙ) Importance of MuonID: Mis-ID: using K S 0 and Λ as source of π and p MuonID: using J/Ψ µ + µ - π µ dominated by decays in flight p µ dominated by combinatorics in muon stations 23
24 B 0 K*µ + µ - (I) Decay totally described via geometrical observables FCNC Only Loops NP The point at A FB = 0 can probe various NP models 24
25 B 0 K*µ + µ - (II) q 2 (GeV 2 /c 2 ) Experimental status not so clear 1 fb -1 ~1200 events If NP signal not so large will be necessary to more bins in q 2 σ(q 2 ) ~ 0.8 GeV 1fb -1 25
26 No time to mention V 0 analysis: Λ, anti-λ and K 0 s production (Λ and anti-λ)/k 0 s ratio CP asymmetries in gluonic b s penguin decays B s ϕϕ, K*K* Charmless hadronic 2-body and 3-body B Decays Radiative penguin decays B s ϕγ, B K*γ More CKM metrology sin2β (B d J/ψK S ) α (B ρπ) 26
27 Conclusions 1. LHC has started: a) The lower centre-of-mass energy of LHC loss will not affect dramatically LHCb performances wait for a measurement of σ bb b) Luminosity conditions opened a very promising window on charm and is expected to approach the LHCb design luminosity in LHCb status is good: a) Already seen a lot of well known strange and charm peaks b) Calibration well underway (alignment and PID) c) First B candidates observed 3. Physics programme: a) Charm analysis will exploit several million of D meson decays b) B physics core analyses can lead to competitive measurements already with 0.1 fb -1 c) 1 fb -1 should lead to quite exciting results and New Physics 27
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