Recent Open Heavy Flavor Results from ATLAS and CMS Experiment at LHC

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Recent Open Heavy Flavor Results from ATLAS and CMS Experiment at LHC 05/11/11 Recent Open Heavy Flavor Results from ATLAS and CMS Experiment at LHC Yen-Jie Lee (MIT) For the ATLAS and CMS collaboration RHIC & AGS Annual Users’ Meeting BNL, Upton, USA 18 June, 2014 RHIC & AGS Annual Users' Meeting

Study of open heavy flavor production at the LHC (1/4) Leptons from heavy quarks μ+ μ- K+ Secondary vertex b Primary vertex Sample O(10%) of b cross-section RHIC & AGS Annual Users' Meeting

Study of open heavy flavor production at the LHC (2/4) Non-prompt J/ψ Leptons from heavy quarks μ+ J/ψ μ- K+ Secondary vertex b Primary vertex Dileptons channel sample O(0.1%) of b cross-section RHIC & AGS Annual Users' Meeting

Study of open heavy flavor production at the LHC (3/4) Non-prompt J/ψ Leptons from heavy quarks μ+ J/ψ μ- K+ Secondary vertex b Exclusive B meson decays Primary vertex J/ψ+1(2) tracks decay channels sample O(0.01%) of b cross-section RHIC & AGS Annual Users' Meeting

Study of open heavy flavor production at the LHC (4/4) Non-prompt J/ψ Leptons from heavy quarks μ+ J/ψ μ- K+ Secondary vertex b Exclusive B meson decays Primary vertex b-jet reconstruction b-tagged jet sample O(100%) of b cross-section and ~70-90% of the b quark energy RHIC & AGS Annual Users' Meeting

RHIC & AGS Annual Users' Meeting Requirements Non-prompt J/ψ Leptons from heavy quarks μ+ J/ψ μ- K+ Secondary vertex b Exclusive B meson decays Primary vertex b-jet reconstruction Requirement: flexible trigger system, muon / electron detection, secondary vertex reconstruction, jet reconstruction RHIC & AGS Annual Users' Meeting

RHIC & AGS Annual Users' Meeting ATLAS detector RHIC & AGS Annual Users' Meeting

EM and Hadron calorimeters photons, isolation, jet reco CMS detector 05/11/11 EM and Hadron calorimeters photons, isolation, jet reco Pb Inner tracker: charged particles vertex, isolation solenoid Pb Muon HCAL ECAL Tracker |η|< 2.5 |η|< 3.0 |η|< 5.2 |η|< 2.4 RHIC & AGS Annual Users' Meeting

Bottom production at the LHC Flavor Creation (FCR) Flavor Excitation (FEX) Gluon Splitting (GSP) LO b-b production (FCR) not dominant at the LHC At NLO Excitation of sea quarks  b(b) + light dijet, w/ b(b) at beam rapidity Gluon splitting into b and b which can also be reconstructed as a single jet arXiv:0705.1937 pp @ 14 TeV RHIC & AGS Annual Users' Meeting

Flavor Creation Candidate (pp @ 7 TeV) b b Reconstructed secondary vertices from b and c quarks RHIC & AGS Annual Users' Meeting

Gluon Splitting Candidate (pp @ 7 TeV) b g b RHIC & AGS Annual Users' Meeting

Study of open heavy flavor production at the LHC (1/4) 1. Leptons from heavy quarks μ+ μ- K+ Secondary vertex b Primary vertex RHIC & AGS Annual Users' Meeting

Heavy flavor muon identification Separate signal muons (heavy flavor meson decay) from pion and kaon decays Momentum balance Scattering angle significance Signal Muon Spectrometer pMS μ μ Inner Detector pID π Background Take the maximum: ATLAS-CONF-2012-050 RHIC & AGS Annual Users' Meeting

Heavy flavor muon signal extraction Composite discriminant r = 0.07 Signal extracted from a two component fit ATLAS-CONF-2012-050 RHIC & AGS Annual Users' Meeting

Suppression of heavy flavor muons in PbPb ATLAS-CONF-2012-050 Muon RCP vs muon pT Muon RCP vs Npart (60-80% as reference) Suppression of heavy flavor muons in central PbPb collisions with respect to peripheral events is observed ( RCP ~ 0.4) RCP ~ constant vs. muon pT RHIC & AGS Annual Users' Meeting

Study of open heavy flavor production at the LHC (2/4) 2. Non-prompt J/ψ μ+ J/ψ μ- K+ Secondary vertex b Primary vertex RHIC & AGS Annual Users' Meeting

Inclusive J/ψ production in PbPb Non-prompt J/ψ to dimuon channel inclusive J/ψ J/ψ  B prompt J/ψ direct J/ψ J/ψ  ψ’,χC CMS PAS HIN-12-014 RHIC & AGS Annual Users' Meeting

Non-prompt J/ψ suppression in PbPb Suppression of non-prompt J/ψ in central PbPb collisions with respect to pp reference is observed ( RAA ~ 0.4) CMS PAS HIN-12-014 RHIC & AGS Annual Users' Meeting

Study of open heavy flavor production at the LHC (3/4) μ+ J/ψ μ- K+ Secondary vertex b 3. Exclusive B meson decays Primary vertex RHIC & AGS Annual Users' Meeting

B meson reconstruction B-meson reconstructed by combination of J/y (decay to dimuon) tracks (assigned pion or kaon mass, w/o PID) B0 B+→ J/ψ K+→μ+μ- K+ B0→ J/ ψ K0* →μ+μ- K+π- Bs→ J/ ψ φ→μ+μ- K+K- B+ Bs 449 RHIC & AGS Annual Users' Meeting 20

Open heavy flavor production in pp collisions 5 GeV ATLAS and CMS have reported B meson (b baryon) cross-section measurements in pp collisions (pT = 5 GeV to 100 GeV) Good agreement between pp data and FONLL calculation RHIC & AGS Annual Users' Meeting

B meson production in pPb collisions at 5.02 TeV CMS PAS HIN-14-004 Three component fit for signal extraction: Signal Combinatorial background from J/ψ-track(s) Non-prompt component from other B-meson decays that form peaking structures (e.g. in B+ analysis, bkg from B0→ J/ψ K0* ) First fully reconstructed B meson signal in heavy ion collisions! B0J/ψK*0 B+J/ψK+ BsJ/ψφ RHIC & AGS Annual Users' Meeting

B meson production in pPb collisions CMS PAS HIN-14-004 Raw yields are corrected by acceptance and efficiency Acceptance Efficiency RHIC & AGS Annual Users' Meeting 23

Differential cross-section pp reference : FONLL calculation is used (agreement with CDF, ATLAS and CMS data) http://www.lpthe.jussieu.fr/~cacciari/fonll/fonllform.html |yCM|<1.93 B+ B0 Bs0 B0J/ψK*0 B+J/ψK+ BsJ/ψφ RHIC & AGS Annual Users' Meeting 24

Nuclear modification factor : RpAFONLL RpAFONLL is compatible with unity within given uncertainties for the three B-mesons |yCM|<1.93 CMS PAS HIN-14-004 RHIC & AGS Annual Users' Meeting 25

Study of open heavy flavor production at the LHC (4/4) μ+ J/ψ μ- K+ Secondary vertex b Primary vertex 4. b-jet reconstruction (Anti-kT r=0.3) UE background subtracted RHIC & AGS Annual Users' Meeting

Tagging and counting b-quark jets Secondary vertex tagged using flight distance significance Tagging efficiency estimated in a data-driven way Purity from template fits to (tagged) secondary vtx mass distributions CMS HIN-12-003 ArXiv 1312.4198 CMS PAS HIN-14-007 RHIC & AGS Annual Users' Meeting

b-jet RpAPYTHIA in pPb collisions at 5.02 TeV CMS PAS HIN-14-007 b-jet RpAPYTHIA is compatible with unity within given uncertainties RHIC & AGS Annual Users' Meeting

b-Jet RAA in PbPb collisions at 2.76 TeV Suppression of b-tagged jets in central PbPb collisions with respect to pp reference was observed ( RAA ~ 0.5) CMS HIN-12-003 ArXiv 1312.4198 RHIC & AGS Annual Users' Meeting

Summary of open heavy flavor production in ATLAS and CMS 2. Non-prompt J/ψ 1. Leptons from heavy quarks μ+ J/ψ μ- K+ Secondary vertex b 3. Exclusive B meson decays Primary vertex 4. b-jet reconstruction RHIC & AGS Annual Users' Meeting

Summary: RAA (CP) vs Npart CMS Non-prompt J/ψ RAA ATLAS Heavy Flavor Muon RCP ( 60-80% as reference) RHIC & AGS Annual Users' Meeting

Summary: Flavor Dependence of Jet Quenching Indication of RAA(B) > RAA(D) > RAA(π) at low pT (However, spectra slope are different) D bJ/ψ π RHIC & AGS Annual Users' Meeting

Summary: Flavor Dependence of Jet Quenching Indication of RAA(B) > RAA(D) > RAA(π) at low pT (However, spectra slope are different) D bJ/ψ π Replace non-prompt J/ψ results by exclusive B meson to fix the x axis scale RHIC & AGS Annual Users' Meeting

Summary: Flavor Dependence of Jet Quenching Indication of RAA(B) > RAA(D) > RAA(π) at low pT (However, spectra slope are different) Indication of RAA(b-jet) ~ RAA(all jets) at high jet pT b-jet D bJ/ψ π b quark jet ~ inclusive jet (mainly gluon jets), contribution from gluon splitting? RHIC & AGS Annual Users' Meeting

Outlook: Statistical Reach in 2015 and beyond 2011 2.76 TeV PbPb data (0.15/nb) b-jet 2013 5.02 TeV pPb data (35/nb) B meson b-jet 2015-17 5.1 TeV PbPb data (1.5/nb) B meson b-jet HL-LHC (10/nb): (b)-jet quenching at O(TeV) ttbar production … Stay tuned! RHIC & AGS Annual Users' Meeting

RHIC & AGS Annual Users' Meeting Backup slides RHIC & AGS Annual Users' Meeting

Open heavy flavor production in pp collisions B+J/ψK+ Good agreement between POWHEG+PYTHIA and data RHIC & AGS Annual Users' Meeting

B+ production in pp collisions at 7 TeV RHIC & AGS Annual Users' Meeting

Supporting material for pp reference Data agrees with the FONLL expectation at 1.96(p- pbar, CDF) and 7 TeV(p-p, ATLAS,CMS) Expect the same agreement at 5TeV collision also CDF ATLAS, CMS Phys. Rev. D 75, 012010 (2007) arXiv: 1307.0126v2 RHIC & AGS Annual Users' Meeting 39

Summary of optimal cuts Variable for B-meson selection B+ B0 Bs c2 confidence level of B vertex fit >0.013 >0.16 >0.037 distance between the primary and the B-decay vertices >3.4 >4.2 cosine value of angle between the displacement and the momentum of the B-meson in the transverse plane > -0.35 > 0.75 > 0.26 difference of the mass between track-pair and resonant meson (unit : GeV/c2) <0.23 < 0.016 RHIC & AGS Annual Users' Meeting 40