ATLAS B Physics Performance Update Detector and trigger

ATLAS B Physics Performance Update  Detector and trigger

ATLAS B Physics Performance Update Detector and trigger Precision measurements Rare decays B production Summary Paula Eerola for the ATLAS Collaboration Beauty 2003, Carnegie Mellon 14-18 Oct 2003 B decays at LHC Unlike BaBar, Belle, access to Bs and b decays Bd (BsKK, BsDsK, BsJ/bJ/ Mixing measurements Much higher statistics than at the Tevatron Access to rare b-decays (BdKBdKBs Precision CPV measurements (Bd J/K0S Overconstrain the unitarity triangles Search for New Physics beyond SM Bs New particles may show up in loop diagrams, overconstrain will allow to disentangle SM components from the new-physics ones b t b d

t d 2 NP? High statistics is a requirement Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct B production at LHC ATLAS/CMS and LHCb are complementary LHC total = 100 mb, inelastic = 80 mb bb = 500 b ATLAS LHCb Central detector Forward detector one b in ||<2.5, pT>10GeV = 100 b L = 1-2 x 1033 cm-2 s-1 Rare decays L= 1034 cm-2 s-1 1 [email protected] cm-2 s-1 : Total number of reconstructed physics events 2.6 x 106 dominated by bb J/ hadronic <5 (all -tag) 3 one b in 1.9<<4.9, pT>2GeV = 230b L = 2 x 1032 cm-2 s-1 1 [email protected] cm-2 s-1 :

Total number of reconstructed physics events 3.4 x 106 1.7 x 106 bb J/ x 106 hadronic Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct The ATLAS Detector The Inner Detector (ID): pixels, silicon detectors and the transition radiation tracker inside a solenoidal 2T field (see H. G. Moser) + Good tracking complementary systematics to the LHCb case + e/ separation in TRT - marginal /K identification ID, calorimeters and muon system cover || <2.5 + Access to central region good for production studies 4 Muon trigger and reconstruction down to pT=5 (3) GeV in muon chambers, tile calorimeter, ID. Electron trigger and reconstruction down to pT=2 GeV in LAr calorimeter, TRT (see S. George) + Better statistics than LHCb in all leptonic channels + Very good for leptonic rare decays (high luminosity running) - Must share trigger bandwidth with other physicshadronic channels suffer Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct

ATLAS construction Installation status: installation activities at LHC Point 1 have started. April 2003: part of the underground experimental area (UX15) has been delivered to ATLAS. Nov 2003: start installing feet and rails. All subdetectors are under construction, some already completed (tile calorimeter). Jan 2004 first detector parts in the cavern: barrel calorimeter, tile calorimeter first, then LAr. Mar 2004 barrel toroid coils. The initial detector ready for global commissioning and cosmics summer 2006, ready for beam in April 2007. Some components will be staged for later installation. Shielding installation in the underground cavern, status 2003. 5 Engineering simulation: the Barrel Toroid and the Barrel Calorimeter installed in position (October 2004). Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct ATLAS initial detector Detector layouts Complete Initial Physics TDR 1999 Radius of B-layer 5 cm 5 cm 4.3 cm

B-layer pixel length in z 400 m 400 m 300 m Middle pixel layer yes missing yes Pixel disk #2, TRT C-wheels yes missing yes Channel Bs Ds( Mass resolution, single Gaussian fit Complet e Initial TDR 46 MeV 46 MeV

42 MeV 19 Proper time resolution Bs decays (TDR layout): Bd J/ K 21for MeV 21 MeV MeV core resolution 52 fs. Initial layout: core resolution > 60 ps, cuts to be optimized in view of ms Decay time resolution measurement (N(events) vs resolution). Initial and complete layouts have appr. the same s resolution (fewer detector layers >< less material). B Ds( ) 6 Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct B-Physics Trigger

7 The ATLAS Trigger will consist of three levels 40 MHz Level-1 O(20 kHz) Level-2 O(1-5 kHz) Event Filter O(200 Hz). B-physics classical scenario: LVL1 muon with p > 6 GeV, || < T 2.4, LVL2 muon confirmation, ID full scan. The B-physics trigger strategy had to be revised changed LHC luminosity target (1 21033 cm-2s-1) changes in detector geometry, possibly reduced detector at start-up tight funding constraints Alternatives to reduce resource requirements require at LVL1, in addition to single-muon trigger, a second muon, a Jet or EM RoI; reconstruct tracks at LVL2 and EF within RoI flexible trigger strategy: start with a di-muon trigger for higher luminosities, add further triggers (hadronic final states, final states with electrons and muons) and/or lower the thresholds later in the beam-coast/for low-luminosity fills. Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct B-Physics Trigger II New Scenario: B-physics trigger types (always single muon at LVL1) di-muon trigger: additional muon at LVL1. Effective selection of channels with J/(+-), rare decays like B +-(X), etc. hadronic final states trigger : RoI-guided reconstruction in ID at LVL2, RoI from LVL1 Jet trigger. Selection of hadronic modes e.g. Bs Ds electron-muon final states trigger: RoI-guided reconstruction in TRT at LVL2, RoI from LVL1 EM trigger. Selection of electrons, e.g. J/ e+e classical scenario as fall-back Results are promising Strong reduction in processing requirements compared to previous strategy that involved full scan of Inner Detector at level-2. Further studies needed.

8 Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct Precision measurements: sin2 sin2 measurement with B JK Maximum likelihood fit with d 0 S simulated inputs: proper time resolution, tag probability, wrong tag fraction, background composition. Direct CP violation term neglected here. TDR layout. 3 [email protected] s-1 J/63) J/65) J/(ee) + B6 N(all reconstructed evts) S/B sin2statistical Lepton tag Jet/charge tag Total 490k 28 250k 32 15k 16 0.023 0.015 0.0126 0.030

0.019 0.016 0.018 0.018 Total Total J/63) + 0.010 J/(ee), B6 J/65) + J/(ee), B6 sin2systematics prod. asymmetry, tagging, background 0.012 0.005 Sensitivity to angle : fit (Adircos(m t) + Amixsin(m t)) in Bhh. Adir, Amix in SM depend on , (or eff), O(|P/T|2). ATLAS alone: (Adir)=0.16, (Amix)=0.21 combined LHC measurement. 9 Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct Precision measurements: B0s Precise measurements of B0s- anti-B0s system parameters : s, ms. Probe Bs mixing phase s= -22 to investigate new physics. ms measured from flavour specific final states Bs Ds and Bs Ds a1 . Already after 1 year (10 fb-1) sensitivity to ms up to 36 ps-1 SM allowed range ms (14.3 - 26) ps-1 fully explored.

10 Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct s and s from B0sJ/ s, s and s determined from angular analyses of Bs J/ ()(KK). can be determined with a relative error of 12% (stat) with 30 fb-1. s Measurement precision of depends on x : for B J/, sensitivity in the range s s s 0.08-0.15 for xs=20-40 (SM) (ms = 13.7-27.3 ps-1) Bs J/: sensitivity for s in the range 0.27-0.31 for xs=20-30 (ms = 13.7-20.5 ps-1) Standard Model region-updated 2003 New physics Left-right symmetric model (NP-LR) - updated 2000. s from J/: ATLAS (3 years). TDR detector. Same as above with complete detector layout Preliminary. s from J/: LHCb(5 years). Performance parameters as 2000 s from J/: ATLAS (3 years). 11 Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct Bc Studies in ATLAS

The expected large production rates at the LHC will allow for precision measurements of Bc properties recent estimates for ATLAS (assuming f(b B )~10-3, 20 fb-1, c LVL1 muon with pT > 6 GeV, || < 2.4) ~5600 B J/ produced events c ~100 B B produced events c s Channels studied so far: Bc J/ (mass measurement), Bc J/ (clean signature, ingredient for |Vcb| determ.) MC generation of Bc events using standard tools is CPU intensive. Implementation of two MC generators in PYTHIA 6.2 Fragmentation Approximation Model MC Full Matrix Element MC (C. Driouichi et al., hep-ph/0309120): based on the extended helicity approach (grouping of Feynman diagrams into gauge-invariant sub-groups to simplify calculations, never done for gg QQ before). pQCD to O(s4), 36 diagrams contributing. 12 Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct Bc Studies in ATLAS II Results from FME generator (BCVEGPY 1.0) pseudo-rapidity Bc* Bc 13 rapidity Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct

Bc Studies in ATLAS III First preliminary results from full detector simulation (Geant3) and reconstruction initial layout channel Bc J/ mass resolution Bc= 74 MeV Fast simul. mass resolution J/ = 41 MeV 14 Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct Rare decays B0s,d FCNC B decays with bs or bd occur only at loop level in SM BR < 10-5 probe of new physics Bs,d BR=3.5x10-9 (Bs) and 1.5x10-10 (Bd) (SM, optimistic) clear signature, tiny BR ideal for new physics observation.ideal for new physics observation. Di-muon trigger allows high-luminosity data-taking. After 1 year at high luminosity (100 fb-1) 4.3 signal After 1 year 1034cm-2 s-1 15 Signal Bs-> Signal Bd->

BG ATLAS 92 14 660 CMS 26 - <6.4 The difference with CMS can be attributed to better vertex reconstruction precision and secondary vertex selection. There is an indication of possible improvement of background conditions with another vertex fit procedure. Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct Rare decays B0s,dX BdK*ideal for new physics observation.ideal for new physics observation.: sensitive to |Vts| . The shape of F-B asymmetry is sensitive to new physics (MSSM) N(Bd)/NBdideal for new physics observation.K*)ideal for new physics observation.~ |Vtd|2/| Vts|2 useful also for ms/md estimation complementary to oscill.meas. 0*

Bd K Statistics with 30 fb-1 channel Bd0 BR 10-7 signal 222 BG 950 Bd0K* 1.5x10-6 1995 290 Bd0 10-6 411 140 1 1 FB ( ) d ds

A s 0 0 2 d dsd cos( ) Three points: mean values of AFB in three q2/ MB2 experimental regions with error bars SM MSSM C7 >0 d cos( ) 1 d cos( ) dsd cos( ) Lowest mass region: sufficient accuracy to separate SM and MSSM if Wilson coefficient C7 <0 MSSM C7 <0 16 d 2

Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct Rare decays B0 K0* BR( B0 K0* ) = (4.20.4) 10-5 Sensitive to New Physics effects through the loop diagram 57 MeV mass resolution S > B 0.3% S B 17 ~ 5.7 W b u,c,t s 2.8% rec. efficiency (incl. muon efficiency) statistics 10 500 events per 30 fb-1 . Combinatorial background from bb(6)X was considered. Specific background from B0K*0 is under investigation. Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct

B production at LHC Bjorken x region: one of Bs in detector volume: LHCb most sensitive to knowledge of structure functions at very low x CDF CDF and D0 beauty cross section in central region underestimated by NLO QCD by ~2.4 ATLAS/CMS 18 LHCb Better agreement at higher pT (D0 measurement with b-jets) Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct B production at LHC II CDF measurement of b-b correlations using + jet data PYTHIA PYTHIA all QCD Semihard Pythia is above the data NLO QCD is below the data 19

3 points where the model dependent acceptance correction was used to correct for isolation cut between and b-jet LHC statistics will allow using exclusive channels instead of b-jets Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct gb->gb g->bb gg->bb B production at LHC III ATLAS - proposal for measuring b-b production correlations using exclusive B-decays and semileptonic decays to muons B Bs J/ B Bd J/Ks0 =J/ - No degradation of efficiency as b-b close in space. 20 In Bs case interesting specific background K originating from s-quark associated with Bs production. Need

Be Bs J/ Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct b production polarization In p-p collisions b baryon will be polarized perpendicularly to production plane. The polarization vanishes as 0 because of p-p symmetry. At LHCb polarization higher than ATLAS/CMS. Angular distribution b J/pdepends on 5 angles (fig) + 6 parameters of 4 helicity amplitudes and polarization Pb . Helicity amplitudes and Pb simultaneously determined. p p 21 n b p b J/pin 3 years will allow precision Pb = 0.016. Also studied

Properties of beauty baryons. Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct Conclusions ATLAS is preparing a multithematic B-physics program. Includes B-decays and B-production. ATLAS B-physics trigger strategy revised to maximize physics potential within tight funding constraints: Rely on dimuon trigger for initial luminosity 2 1033 cm-2s-1, extending the selection when the luminosity falls. The main emphasis will be on underlying mechanisms of CP violation and evidence of New physics. ATLAS is especially precise in measurement of angle . In Bs J/ large CP violation would indicate new physics. There is sensitivity to ms beyond SM expectations. The expected large production rates at the LHC will allow for precision measurements of Bc properties: e.g. ~5600 Bc J/ produced events, ~100 Bc Bs prod. events Rare decays B (X) have a favourable experimental signature, allowing measurements also at the nominal LHC luminosity 10 34 cm-2s-1. Will measure branching ratio of Bs which is in SM of order Br<(10-9)

Precision measurements will be done for B K*. Large sample of BK* allows for probing New physics effects. Beauty production and bb correlations in central LHC collisions will be measured for QCD tests. Complementary phase space region to LHCb. 22 Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct Backup slides 23 Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct Reconstruction of masses Mass resolution single Gauss fit [MeV/cMeV/c2] TDR Complete Initial Bs Ds( 42 46 46

B 69 79 80 Bs J/ 15 17 17 Bd J/K 19 21 21 b J/p 22 25 26 24 Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct B-Physics Trigger III Di-muon

effective selection of channels with J/(+-), rare decays like B +-(X), etc. single-muon h b c minimum possible thresholds: pT > 5 GeV (Muon Barrel) pT > 3 GeV (Muon End-Cap) actual thresholds determined by LVL1 rate at LVL2 and EF: confirmation of muons using the ID and Muon Precision Chambers trigger b h all all di-muon

J/ c @1033cm-2s-1 at EF mass and decay-length cuts, after vertex reconstruction trigger rates (21033 cm-2s-1): Armin NAIRZ~200 Hz after HeavyLVL2, Quarkonium Workshop, ~10 Paula Hz after EF FNAL, September 20-22, 2003 Eerola 25 Beauty 2003, Carnegie Mellon 14-18 Oct 8 ATLAS initial detector Detector layouts Complete Initial Physics TDR 1999 Radius of B-layer 5 cm 5 cm 4.3 cm

B-layer pixel length in z 400 m 400 m 300 m Middle pixel layer yes missing yes Pixel disk #2, TRT C-wheels yes missing yes Channel Mass resolution, single Gaussian fit Complet e Initial TDR Bs Ds( 46 MeV 46 MeV

42 MeV B 79 MeV 80 MeV 69 MeV Bs J/ 17 MeV 17 MeV 15 MeV Bd J/K 26 19 Paula 21 MeVEerola MeV 14-18 Oct Beauty 2003, Carnegie Mellon 21 MeV Software & physics channels Physics channels Bs Ds( B

Bs J/ Bd J/K0 b J/0 Detector layouts TDR Complete Initial Radius of b-layer 4.3 cm 5 cm 5 cm Longitudinal pixel size of blayer 300 m 400 m 400 m Middle pixel layer

yes yes missing Pixel disk #2 and forward TRT wheels yes yes missing Software Complete Initial Detector simulation atsim 6.0.2 atlsim 6.0.2 Reconstruction atrecon6.5.0 (xKalman) atrecon6.5.0 (xKalman) Analyses 27 CBNT, CTVMFT vertexing

Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct B-hadrons proper time resolution Single Gauss fit TDR Bs Ds 67 fs B 69 fs Bs J/ 63 fs Bd J/K b J/p 69 fs 73 fs V.M. Ghete, E. Bouhova, P. Reznicek, M. Smizanska, B. Epp, S. Sivoklokov, N. Nikitine, K. Toms 28 Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct B-Physics Trigger The

ATLAS Trigger will consist of three levels Level-1 (40 MHz O(20 kHz)) Level-2 (O(20 kHz) O(1-5 kHz)) muons, Regions-of-Interest (RoIs) in the Calorimeters B-physics (classical scenario): muon with pT > 6 GeV, || < 2.4 RoI-guided, running dedicated on-line algorithms B-physics (classical scenario): muon confirmation, ID full scan Event Filter (O(1-5 kHz) O(200 Hz)) offline algorithms, alignment and calibration data available The 29 B-physics trigger strategy had to be revised changed LHC luminosity target (1 21033 cm-2s-1) changes in detector geometry, possibly reduced detector at start-up tight funding constraints Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct B-Physics Trigger II

Alternatives to reduce resource requirements B-physics trigger types (always single muon at LVL1) require at LVL1, in addition to single-muon trigger, a second muon, a Jet or EM RoI, reconstruct at LVL2 and EF within RoI re-analyse thresholds and use flexible trigger strategy start with a di-muon trigger for higher luminosities add further triggers (hadronic final states, final states with electrons and muons) later in the beam-coast/for low-luminosity fills di-muon trigger: additional muon at LVL1. Effective selection of channels with J/(+-), rare decays like B +-(X), etc. hadronic final states trigger : RoI-guided reconstruction in ID at LVL2, RoI from LVL1 Jet trigger. Selection of hadronic modes e.g. Bs Ds electron-muon final states trigger: RoI-guided reconstruction in TRT at LVL2, RoI from LVL1 EM trigger. Selection of electrons, e.g. J/ e+eclassical scenario as fall-back Results are promising 30 Strong reduction in processing requirements compared to previous strategy that involved full scan of Inner Detector at level-2. Further studies needed. Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct

Sensitivity to angle Signal yields 3y @1033cm2s-1 Atlas LHCb 5y Offline 2-body select. Mass resol [MeV] Signal/2-body bck Signal/other bck Adir Amix correlation 2.3k 70 0.19 1.6 0.16 0.21 0.25 4.9k 17 15 >1 0.09 0.07 0.47 -sensitivity as a function of and theoretical uncertainty of |P/T| using full LHC potential Max.likelihood computed

from: *Proper time *Invariant mass *Flavour at production *Specific ionisation: Signal decay parametrized in terms of Adir , Amix: Adir cos( m t) + Amix sin( m t) Adir , Amix in SM depend on or effPT were used to derive sensitivity to ATLAS compensate large backgrounds with multi-channel fits. | P T | 30% | P T | 0% 31 Simulateous fit of 6 contributing decays parametrized by 9 coefficients, constrained by current experimental limits. The current theoretical uncertainty on |P/T|, |P/T| ~30%, dominates other systematical and statistical errors of full LHC potential. Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct s and s from B0sJ/ s and s measured from Bs J/ indep. measurement of s from Bs J/. s, s and s are determined simultaneously with helicity amplitudes A|| (t=0), AT(t=0), A0(t=0), 1, 2 from angular analyses of Bs J/ ()(KK). s can be determined with a relative error of 12% (stat) with 30 fb-1. s depends on xs: for Bs J/, sensitivity in the range 8-15% for xs=20-40

(SM range) Bs J/, sensitivity for s in the range 27-31% for xs=20-30 32 Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct DGs and fs from B0sJ/yf (h) Standard Model region-updated 2003 New physics Left-right symmetric model (NP-LR) updated 2000. ATLAS (3 years): LVL1 1trigger only. TDR Detector. ATLAS - same as above with Final Detector Layout Preliminary LHCb(5 years): full 1st Level trigger, performance parameters as given in 2000 33 Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct Background,Signal (new cuts) CMS vertex cuts gives rejection better than 2.310-4 Try to apply similar cuts for ATLAS data compare two vertex fit procedures CTVMFT (CDF) and dedicated fit procedure from xKalman (private) Efficiencies of vertex selection cuts (104 pb-1) (cuts chosen to give the same signal efficiency) Cuts (CTVMFT and xKalman) CTVMFT xKalman

Error on the decay length L <60m ; <70m 0.55 0.41 0.37 0.33 L/ ; L/ Both cuts together + Cos()>0.99987 ( Number of BG events (with mass and isolation cuts) 34 (0.90.2) 10- (4.41.6) 10-3 2 5415 Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct 249 Discussion xKalman

The plot shows the profile histogram of decay length L vs. error on this value for the background events. For xKalman it is correlated i.e. larger decay length has larger errors (as it should be for BG) This explain the better rejection of this algorithm events survived L > L_cut will be removed by cut > _cut CTVMFT 35 Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct B production at LHC (III) ATLAS - proposal for measuring b-b production correlations using exclusive B-decays and semileptonic decays to muons B Bs J/ B Bd J/Ks0 =J/ - No degradation of efficiency as b-b close in space. 36 In Bs case interesting specific background K originating from s-quark associated with Bs production. Need Be Bs J/ Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct

Bd K* for 2 fb-1 with Initial Layout 2.8% rec. efficiency, 57 MeV mass resolution Level 1: 6 Level 2: : cluster ET cut, shower shape cuts, 0 rejection K*: 2 charged (opposite-sign) tracks, pT cuts Event Filter: : level-2 confirmation K*: vertexing, impact-parameter cuts Combinatorial background from bb(6)X was considered. Background from B0K*0 is under investigation. 37 Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct Installation schedule The schedule consists of 6 major phases which are partially overlapping + 50 days for global commissioning and 40 days for cosmic tests. ID Name 1 134 704 1118 1379 1489 377 days

2003 PHASE 1: Infrastructure 643 days PHASE 2: Barrel Toroid & Barrel Calorimeter PHASE 3: End-cap Calorimeters & Muon Barrel PHASE 4: Big Wheels & Inner Detector PHASE 5: End-Cap Toroid & Small Wheels PHASE 6: Beam Vacuum, End wall Chambers, Shielding 1580 Global Commissioning 1581 Cosmic tests 1582 ATLAS Ready For Beam 38 2004 2005 2006 343 days 283 days Paula Eerola Beauty 2003, Carnegie Mellon 14-18 Oct 166 days 53 days 50 days 40 days 0 days 2007

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