LHCb analysis. A. Sarti LNF - INFN

Transcription

1 LHCb analysis A. Sarti LNF - INFN

2 Where are we? Summer 2006 B factories σ(α) 7 σ(γ) 20 : Expect significant improvement in the future σ(sin2β) B factories plan to double their statistics! Bs sector: Tevatron σ(ϕs) 0.6, σ( Γs/Γs) 0.15, σ( ms) 0.5% Bs < (CDF) More years of running ahead! σ( ρ ) / ρ = 17% σ( η ) / η = 4.7% 2

3 LHCb startup plans Startup of LHC beam in 2007 Pilot run at 450 GeV per beam with full detector installed in Nov/Dec (L=1027 to 1028 cm 2s 1 ; 40 to 400 Hz inelastic interactions) Establish running procedures Time and space alignment of the detectors, calibrations Middle of 2008: LHC ramps up to 7 TeV per beam L=1032 to 1033 cm 2s 1. Complete commissioning of detector and trigger at 14 TeV Including calibration of momentum, energy and particle ID Start of first physics data taking Luminosity measurements: Using beam gas interactions (pilot run) Using Z0 decays Rate = 0.06 Hz, stat< 4%, theo=o(5%) in 3 h (L=2*1032 cm 2s 1) 24k sig. ev rec/sel = 65% tot = 17% BW fit: m = 91.07±0.02 s = 3.75±0.04 M. Polilener 3

4 Baseline luminosity program Baseline LHCb luminosity programme Integrated L of ~0.5 fb 1 delivered in 2008, ~2 fb 1 in subsequent years Note: instantaneous luminosity at the LHCb IP of cm 2 s 1 is almost two orders of magnitude below the LHC challenges LHCb luminosity requirements can be fulfilled very early in the LHC operation pp interactions/crossing LHCb n=0 MC studies are being performed also for L = cm 2 s 1 Physics results: L 0.5 fb 1 in ~2009 L 2 fb 1 in ~2010 L 10 fb 1 in ~2014 n=1 4

5 Trigger, computing and Software The L0 trigger (based on custom electronics) aiming to reduce the 40 MHz BX rate to 1.1MHz is being assembled. Preliminary tests are completely satisfactory. The L0 filtered data flows to the HLT trigger farm as Ethernet frames. Data frames injection tested successfully. Farm monitoring and control tools ready. The HLT event builder is ready. The HLT selection algorithms continuously improve their speed, rejection power and selection efficiency. 5

6 Data flow, reconstruction & analysis Data flux to the 6 LHCb Tier1 s for event reconstruction amounts to 60 MB/s (10 MB/s each). Data transfer seems not to be an issue, as far as the intensity is concerned but the transfer channels are unreliable yet. Getting ready for the reconstruction and alignment software challenge in 2007 The LHCb DIRAC middleware manages automatically the reconstruction, pre selection. It manages the MC production too. Rather an advanced tool, deeply tested during the DC06. The LHCb distributed analysis on the Grid is a work in progress. The centralized approach managed by the DIRAC WMS would be the preferred solution. Technical and legal issues to be addressed due to the pilot agents approach to the Grid. Data challenge '06 is ongoing (DC06). So far: 140M bb inclusive and 100M min bias events produced. Currently under reconstruction on all T1's (excellent CNAF efficiency after Castor fix) Signal events production/reconstruction (74M) just started 6

7 Where are we contributing? m, s and s: Bs Ds, J/, J/ and c : Bd 0 + and : Bd J/ Ks : ACP(t): Bs Ds K and Bd(s) + Decay rates: B0d D0(K,KK) K*0, B D0(K, ) K Dalitz analysis: B,0d D0(Ks,KsKK) K,*0 Rare decays: Penguins: Radiative Bd (K*, ),Bs ; Electroweak Bd K* ; Bs ; Gluonic: Bs, Bd Ks; t channel: Leptoquark B e Box diagrams: Bs B Contributions from INFN Main physics program... s, b baryon, c physics, Jets (higgs) s 7

8 INFN efforts in many areas! Being ready for the challenging physics program of previous page means... hard work in several different fields: L measurement using beam gas or Z0, MC simulation and production Time/space alignment of detector, & RICH detector calibration & RICH reconstruction software, grid production/tools Tagging studies: selections, control channels, systematics, CP fits Proper time studies, error evaluation, use in CP fits Trigger: HLT PID:,K pid calibration & studies, CP fits µeff = ± 0.07 % πmisid = ± kaon ID efficiency K K or p π K or p % Momentum (GeV/c) 8

9 (*) Tagging(*) MI LNF M. Calvi convener Qvertex, QJet Full MC performance on triggered and selected events: εd2= 4 5% for B0 e,µ - Opposite side εd = 7 9% for Bs w measured in data using high statistics control channels: σ(wos)/wos ~ 0.15% B PV Same side Bs0signal K+ K K + Addressing systematics: Yield in 2 fb 1 Bbb/S B0 J/ψ(µµ)K*0 0.7 M 0.2 B+ J/ψ(µµ)K+ 1.7 M 0.4 B+ D0π+ 1M 0.1 B0 D* µ+ ν 9M M 0.7 2M M 0.4 B+ D0 (*) µ+ ν Bs Ds(*) µ+ ν Bs Ds+ π w is different in signal and control samples sub samples reweighting Unified selection for signal and control channels (e.g. B J/ψ(µµ)+2 tracks) Clean B+ D0π+ signal K- D σ(wss)/wss ~ 1% B mass (GeV/c2) - 0 opposite 2 Channel CDF results: εd2= 1.8±0.1% for combined OST εd2= 3.7±0.9% for semileptonic SST εd2= 4.8±1.2% for hadronic SST 9

10 (*) Proper Time(*) BO MI Measurement of B lifetime using lifetime biased sample Proper time resolution: Proof of principle achieved on full MC B0 D π+ signal fast MC signal+bckg, seeded with full MC events dilutes cos( mst) and sin( mst) terms, like mistag does knowledge of resolution essential for Bs time dependent physics Obtain information from unbiased data (J/ψ trigger without biasing cuts): Prompt J/ψ µµ, B+ J/ψK+, B0 J/ψK*0 60k signal events, S/B ~ 4 (B0 D π+ yield in 0.2 fb 1) fitted value = ± ps generator value = ps lifetime/microns 10

11 Control channel Bd J /Ks & d= 2 To be measured as a proof of principle Key channel for tagging validation Well measured by Belle and BaBar sin(2 )meas = / fb 1 LHCb Control channel Bd J/ K* 0.5 fb 1 (¼ of nominal sin2 = 0.04 (0.03 world average) 0,04 σ(sin2β) 220k events (sin2 ) = ,03 now pre LHCb 0,02 0,01 with LHCb at L=2fb 1 0, with LHCb at L=10fb year 11

12 Control channel Bs Ds & ms Bs Ds π+: important control channel for time dependent Bs analyses Other uses of Bs D π : + s Measurement of ms (with 0.5 fb 1) Entries per 0.02 ps Flavour specific decay: can use to measure dilution of Bs oscillations once mistag known (from other channels) can isolate proper time resolution effect Expect 140k events in 2 fb 1 with Bbb/S < 0.05 at 90% CL and average σt ~ 40 fs Full simulation 0.5 fb 1 (signal only, ms = 20 ps 1) σstat( ms) = ± ps 1, i.e. 0.07% dominated by systematics on proper time scale, but at most σ(τ(b0))/τ(b0) = 0.5% Normalization channel for all Bs BR measurements Reconstructed proper time [ps 1] CDF result: ms = 17.77±0.10(stat)±0.07(sys)ps 1 ~10% absolute measurement of BR(Bs Ds π+) expected from Belle s current data 12

13 s the strange counterpart of 2 φs is the strange counterpart of φd=2β: φs very small in SM φssm = ± Could be much larger if New Physics runs in the box Golden b ccs mode is Bs J/ψφ: Angular analysis needed to separate CP even and CP odd contributions Sensitivity: Recent D0 result [hep ex/ ] using Bs J/ψφ: φs= 0.79 ±0.56(stat) (syst) with 1.1 fb 1 Expect <0.2(stat) by end of Tevatron σstat(φs) = with 0.5 fb 1 13

14 0,8 σ(ϕs) σ(ϕs) s, s/ s... cont'd now 0,6 0,4 pre LHCb 0,2 0, ,04 0,03 now 0,02 LHCb LHCb at L=2fb 1 at L=10fb year LHCb at L=2fb 1 ( s) = 0.013(stat) 0,01 0,00 pre LHCb LHCb at L=10fb year Results below with L = 2fb 1 for LHCb and L = 10fb 1 for ATLAS and CMS LHCb: 130k Bs J/ψφ untagged events, m = 8 MeV/c2, = 36fs, stat( s/ s) = 0.009, (sin s)=0.02, S/Bbb= 8 ATLAS: 90k Bs J/ψφ untagged events, m = 16.5 MeV/c2, = 83fs, stat( s/ s) = 0.023, (sin s)=0.08 CMS: 109k Bs J/ψφ untagged events, m = 13 MeV/c2, = 77fs, stat( s/ s) =

15 from charmed modes m Several modes to measure γ (at LHCb) LHCb simulation ADS+GLW Break through of B factories, but Dalitz analysis with D 3 body Dalitz analysis with D 4 body statistically limited and extremely challenging! Golden Bs DsK mode ρ(770) Sensitivity estimated at ~4.2 with L=2fb 1 Assuming the same improvements of the Dalitz syst. error as for the projections of the B factories to 2008 D mode Method B+ DK+ Kπ + KK/ππ + K3π ADS+GLW 5º 15º B D*K Kπ ADS+GLW Under study B+ DK+ KSππ Dalitz 8º + B DK KKππ 4 body Dalitz 15º B+ DK+ Kπππ 4 body Dalitz Under study B0 DK*0 Kπ + KK + ππ ADS+GLW B0 DK*0 KSππ Dalitz Bs DsK KKπ tagged, A(t) K* and DCS K* σ(γ), 2 fb 1 7º 10º Under study 13º σ(γ) [o] B mode (tree) m+ now 12 pre LHCb 8 4 with LHCb with LHCb at L=2fb 1 at L=10fb year By 2014 sensitivity at about 2 degrees 15

16 from charmless modes 2 fb 1 can be extracted from the studies of ACP(t) of B h+h decays σstat(γ) = 4 Adir and Amix depend on mixing phase, angle γ, and ratio of penguin to tree amplitudes = d eiθ Using U spin one can solve for Method and parametrization from R. Fleischer, PLB 459 (1999) 306 γ 2 fb 1 One of the first 'full exercise' analyses in LHCb. Dedicated task force addresses: Selection, Tagging, Proper Time, PID, Asymmetry fit, Systematics Joint effort: BO FI LNF MI B modes (penguin) Method B0 π+π & Bs K+K Tagged, A(t) Perfect U spin symmetry Fleischer Up to ~20% violation If perfect U spin symmetry assumed Assumption If only 0.8<dKK/dππ<1.2 assumed σstat(γ) = fake solution γ σ(γ), 2 fb 1 4º 7º 10º 16

17 Rare decays: Bs µ+µ s Very rare loop decay, sensitive to new physics: t b W W? µ+ ν µ BR ~ in SM, can be strongly enhanced in SUSY Current 90% CL limit from CDF+D0 with 1 fb 1 is ~20 times SM Main issue is background rejection Current analysis achieves a very good separation of signal and background With limited MC statistics, indication that main background is b µ, b µ Big effort (LNF, Milano, Roma1, Roma2) in developing and study of dimuon channels (HLT, ID, selection and analysis tools) 17

18 BR (x10 9) LHCb limit on BR at 90% CL (only bkg is observed) BR (x10 9) Bs µ+µ Expected final CDF+D0 limit Uncertainty in bkg prediction LHCb sensitivity (signal+bkg observed) (signal+bkg isis observed) 5σ observation SM prediction 3σ evidence SM prediction Integrated luminosity (fb 1) 0.05 fb 1 overtake CDF+D0 0.5 fb 1 exclude BR values down to SM Integrated luminosity (fb 1) 2 fb 1 3σ evidence of SM signal 10 fb 1 >5σ observation of SM signal 18

19 B0 K*0µ+µ Belle result with 0.35 ab 1 Suppressed loop decay, BR ~ Belle, 2005 FB asymmetry AFB(s) in the µµ rest frame is sensitive probe of New Physics Β 0 AFB(s), 2 fb 1 µ θ µ+ Standard model Κ Yields 7.7k signal events/2fb 1, Bbb/S = 0.4 ± 0.1 expect 0.6k at Belle+Babar (2 ab 1) s = (mµµ)2 [GeV2] Atlas : 800ev /10fb 1 B0 K*0µ+µ After 2 fb 1, zero of AFB(s) to ±0.52 GeV2 determine C7eff/C9eff with 13% stat. (SM) Other sensitive observables based on transversity angles accessible (under study) 19

20 Other RD: Bs,d eµ(*), B D0τν(**) Cagliari (**) Milano (*) Based on the SU(4)c model: expected in some extensions of the SM (SO(10), Compositeness ) same topology and backgrounds of Bs µµ best U.L., Belle LHCb best U.L., CDF 2fb 1 σ=50mev (compared to 20MeV of Bs µµ ) Study of Rbr = BR(B+ D0 )/BR(B+ D0 ) to constrain H± mass: Yields: with 2fb 1 expect 2.4M ( ) and 10k ( ) events. B factory: 140ev/ab 1 ( ) Background studies ongoing. First results are promising. 20

21 Charm physics Foresee dedicated D* trigger: Huge sample of D0 h+h decays Tag D0 or anti D0 flavor with sign of pion from D* D0π Interesting (sensitive to NP) & promising searches or measurements: Potentially usable statistics in 10 fb 1 D* D0(hh)π 500M D* tagged D0 K+K from b hadrons 25M D* tagged WS D0 K+π from b hadrons 1M Time dependent D0 mixing with wrong sign D0 K+π decays Direct CP violation in D0 K+K ACP 10 3 in SM, up to 1% (~current limit) with NP Expect σstat(acp) ~ O(10 3) with 2 fb 1 D0 µ+µ (Roma1, LNF) BR in SM, up to 10 8 with NP (current limit ~ 10 6 ) Expect to reach down to ~ with 2 fb 1 21

22 Working to reconstruct high Pt jets in the limited LHCb acceptance to assess the observability of a Higgs signal (or an heavy object decaying into bb) Associated HW/Z production: beam jet 1 p ino tr eu n W q q' p b H jet b b Expect ~100 events year produced Use NNET variable for evt selection HW lep ton MI (*) (*) Jet reconstruction C.Matteuzzi convener beam jet 2 jet b NNET analysis result with: HW No E jet corrections No jet calibration For M j1j2 > 80 GeV tt S/ B = 0.19 (9 events/2 fb 1 only muons) 06/02/07 A.NNET Sarti output tt M12 (NNET>0.7) 22

23 LHCb Sensitivities with 2 fb 1 Subset of studied modes LHCb only L=2 fb 1 σ ( ρ ) / ρ = 7.1 % σ( η ) / η = 3.9% 23

24 INFN analysis organization INFN groups are heavily involved in the detector construction, commissioning and software: analysis manpower has been, up to now, somehow limited An LHCb Italy meeting will be held 12 February at Bologna with the aim of discussing how to organize the Italian analysis Joint efforts are going to be realized in the next months (physics studies with dimuon channels seems to be a good possibility for this common initial effort) This goal is nearly challenging as the one of detector commissioning 24

25 Conclusions LHCb has an important physics potential couple of superb b s observables (Bs µµ, Bs mixing phase) several other exciting windows of opportunity with loop decays several measurements of γ from tree decays Year ahead: commissioning+ pilot run We expect to have first phys result by 2009 on few channels: Control channels: sin2, Ms Measurement of s, BR(Bs ) Detector commissioning is still underway. Manpower dedicated to the analysis will increase as commissioning will absorb less resources Analysis organization: physics channels, working groups, responsibilities are going to be discussed Collaboration with theory network Flavianet is planned 25

26 B physics Bologna IV Incontro sulla Fisica del B Bologna, Febbraio

27 Spares 27

28 Present LHCb status December countries 48 institutions ~600 people 28

29 Pythia production cross section Forward In the forward region the bb production cross section is large: At L=2x1032/cm2s, we get 1012 B hadrons in 107 sec Limited solid angle Limited cost (75 MCHF) The hadrons containing the b & b quarks are both likely to be in the acceptance (flavor tagging!) B s are moving with considerable momentum ~50 GeV, thus minimizing multiple scattering: Background rejection via detached vertex Improved decay time resolution pt 100 µb 230 µb η Production Of B vs B B B B B Compared to Tevatron: ~5 x σbb ; ~3 x σbb/σinelastic Dedicated large bandwidth triggers (2000 Hz) and excellent hadron ID θ B (rad) θ B (rad) LHCb acceptance 29

30 LHCb detector Muon Detector cavern wall Tracking stations Trigger Tracking Calorimeters rad m mrad proton beam interaction region Vertexing Tracking Hadron Identification e/γ Hadron triggering µ 30

31 LHCb trigger (particles bending in the other plane) µ γ π0 e π,k,p Pile up veto: Remove bunch crossings with too many beam beam interactions (not applied to µ trigger) Hardware trigger (customs boards) with 4 µs latency Reduces 10 MHz inelastic collision rate to 1 MHz: Ptµ1 ( + Ptµ2 ) > 1.3 GeV Ete > 2.8 GeV Etπ,K,p > 3.6 GeV Etγ > 2.6 GeV Etπ0 > 4.0 GeV 31

32 Physics organization Tagging: development, implementation and tuning of tagging algorithms, strategies for tagging systematics evaluation, sin(2β) measurement with B0 J/ψ KS as a proof of principle that tagging dilutions can be controlled, B** spectroscopy Proper time and mixing systematics related to proper time fitting feasibility and strategy of lifetime measurements and Γs (from exponential fits) ms (or ms/ md) measurement Production and Decay models: MC studies and maintenance, luminosity and cross section measurements, absolute/relative normalization for branching fraction measurements, b hadron production fractions, b hadron spectroscopy, bb correlation 32

33 Physics organization CP: measurements of α, β, γ; ambiguities measurements of φs and Γs (from asymmetries) angular analyses, Dalitz analyses, charm physics (D0 mixing, D KK CP asymmetry,...) Rare decays radiative decays (all types of b hadrons,...) B0 K* l+l (AFB, ), inclusive b s l+l Bs µ+µ (and other fully leptonic modes) rare decays of charm, e.g. D0 µ+µ Jets jet algorithms, jet tagging feasibility of measurements of light Higgs, top physics other non b, non c physics... 33

34 Expected tracking performance High multiplicity environment: In a bb event, ~30 charged particles RICH1 traverse the whole spectrometer VELO Track finding: efficiency > 95% for long tracks from B decays (~ 4% ghosts for pt > 0.5 GeV/c) TT KS π+π reconstruction 75% efficient for decay in the VELO, lower otherwise Average B decay track resolutions: Impact parameter: ~30 µm Momentum: ~0.4% Typical B resolutions: Proper time: ~40 fs (essential for Bs physics) Mass: 8 18 MeV/c PYTHIA+GEANT full simulation 2 Magnet T1 T2 T3 RICH2 Mass resolution Bs µµ 18 MeV/c2 Bs Ds π 14 MeV/c2 Bs J/ψ φ 16 MeV/c2 Bs J/ψ φ *8 MeV/c2 * with J/ψ mass constraint 34

35 Tagging breakdown Tag εd2=ε(1 2w)2 Opposite µ 0.7% 1.8% Opposite e 0.4% 0.6% Opposite K 1.6% 2.4% Opposite Qvtx 0.9% 1.3% Same side π (B0) 0.8% 1.0% Same side K (Bs) 2.7% 3.3% Combined (B0) Combined (Bs) 4% 5% 7% 9% 35

36 b sss hadronic penguin decays Also accessible at LHCb Best channel is Bs φφ CP violation < 1% in SM (Vts enters both in mixing and decay amplitudes) significant CP violating phase φnp can only be due to New Physics Angular analysis required 4k signal events per 2 fb 1 (if BR= ), 0.4 < B/S < 2.1 at 90%CL After 10 fb 1: φnp! σstat(φnp) = 0.10 with 2 fb 1 ±0.042 from Bs φφ ±0.14 from B0 φks (4k signal events, B/S < 2.4 at 90% CL) expect ±0.12 from B0 φks at end of Belle+BABAR program 36

37 G charmless Particle ID plays a crucial role: e.g. disentangle the various B hh modes No PID For B0 and Bs modes decaying to same final state, only handle is mass resolution: MBs MB0 = 88 MeV/c2 e.g. B Kπ 19 MeV/c2 (DC04) 24 MeV/c2 (DC06) ππ invariant mass With PID Not too comfortable, need to watch and possibly improve With PID ππ invariant mass Kπ invariant mass 37

38 G charmless reach Fit results corresponding to Int. L=2fb 1 (107 seconds at nominal LHCb luminosity) Bd π+π σ(c) Bs K+K σ(s) Bd K+π Bs π+k σ(acp) BR 10-6 Yield B/S B/S bb spec 38

39 Neutrals reconstruction and Mass resolution σ=~10 (15) MeV resolved (merged) πo Example: time dependent Dalitz Plot (Snyder Quinn) for Bo ρπ π+π πo Resolved Merged πo πo 14K signal events in 2fb 1 with B/S<0.8, yielding σ(α)=10o σ(α) [o] Efficiency (%) LHCb Bd (ρπ)o only pre LHCb 4 with LHCb at L=2fb Merged with LHCb at L=10fb now Resolved 2010 Transverse energy (GeV) 2014 year 39

40 Search for Pati Salam Leptoquarks with B(d,s) eµ (INFN Cagliari) Based on the SU(4)c model: expected in some extensions of the SM (SO(10), Compositeness ) L= 0.5fb 1 UL 6*10 9 best U.L., Belle best U.L., CDF σ(core)=50mev (compared to 20MeV of Bs µµ ) LHCb 2fb 1 N.B. this analysis has the same topology and backgrounds of Bs µµ we already have a selection for that!!!! 40

41 Charged higgs constraint Charged higgs mass constraint 41

42 Perspectives up to 2014 Pre LHCb γ sin2β α ϕs Γs/Γs Pre LHCb: B factories and Tevatron at end of their life, LHCb L=2 fb 1 LHCb L=10 fb σ ( ρ ) / ρ = 7.1 % σ( ρ ) / ρ = 3.6% σ ( η ) / η = 1. 8% σ( η ) / η = 3.9% 42

43 SuperB reach NP NP r a d I a t I v e Observable CKM (2ab 1) SuperB (50ab 1) Comments sin(2β) (b ccs) <1 <1 no improvement 3K ~4 ~(6,3,5) ~3 <2 ~(2,1,2) ~1 Globally could be a factor 5 improvement α (ππ,ρρ,ρπ) 5 8 ~1 γ (DK) (5 10) (1 2) (Tree decays)glw+ads+dalitz also precisely measured at LHCb Vcb incl Vcb excl 1% 1.5% 4% 0.5? 1%? More theo. parameters from data Depends on Lattice B D*τν 10 15% 2 3% SM senstitive to NP (H±) Vub incl Vub excl 10% 10% 2%? 2%? More theo. parameters from data Depends on Lattice Br(B lν) Br(B µ υ) 20% visible 4% 8% >5 improprement Lattice is crucial Br(B (ρ,ω),γ) Vtd/Vts from ργ/k*γ dep. Lattice Br(B µµ) Br(B eµ) not measurable Intersting for MFV at 2ab 1 off by two order of magnitude.. AFB (Xsl+l ) s0 25% 25% 6% 12% 5% 9% [1 1.5]% 2.5% for exclusive modes (and mainly for muons) also precisely measured at LHCb [1 2]% 0.65% [0.5 1]% ~0.3% Interesting if σ<0.5 (SM) Interesting if σ<0.5 (SM) Exclusive modes precisely LHCb sin(2β) (Peng.) φk (f0,η π0)k0 AFB (K*l+l ) s0 ACP (K*l+l ) at high masses AFB (Xsγ) AFB (K*γ) 43

44 Comparison Bfact < > LHCb e+e is advantageous in CPV in B φks, η KS, CPV in B KSπ0γ B Kνν, τν, D(*)τν Inclusive b sµµ, see τ µγ and other LFV D0D0 mixing LHCb is advantageous in CPV in B J/ψKS Most of B decays not including ν or γ Time dependent measurements of BS B(S,d) µµ BC and bottomed baryons These are complementary to each other!! 44

45 Super LHCb? Luminosity is tunable in LHCb area by adjusting beam focus, much smaller than the LHC design luminosity of 1034 cm 2s 1 Present LHCb detector: n = # of pp interactions/crossing Designed to run at 2x1032 cm 2s 1 to limit number of interactions per bunch crossing (n): Smaller occupancies, less confusion Little pile up (n=0.5 ) Less radiation damage Detectors can operate up to 5x1032 cm 2s 1: Only channels with muons benefit from cranking up luminosity Many important measurements will be statistics limited in 10 fb 1 Upgraded LHCb detector? Aim to run at ~2x1033 cm 2s 1 (n=4) for ~5 years and collect 100 fb 1 Does not require Super LHC luminosity upgrade (but it is compatible with it) Need radiation hard vertex detector and detached vertex trigger in L0 LHCb Upgrade Workshop Jan 11 12, 2007, Edinburgh (see 45