Presentation is loading. Please wait.

Presentation is loading. Please wait.

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

Published byKory Long Modified over 8 years ago

Similar presentations

Presentation on theme: "Recent Open Heavy Flavor Results from ATLAS and CMS Experiment at LHC"— Presentation transcript:

1 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

2 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

3 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

4 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

5 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

6 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

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

8 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

9 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: 14 TeV RHIC & AGS Annual Users' Meeting

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

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

12 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

13 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 RHIC & AGS Annual Users' Meeting

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

15 Suppression of heavy flavor muons in PbPb
ATLAS-CONF 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

16 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

17 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 RHIC & AGS Annual Users' Meeting

18 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 RHIC & AGS Annual Users' Meeting

19 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

20 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

21 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

22 B meson production in pPb collisions at 5.02 TeV
CMS PAS HIN 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

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

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

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

26 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

27 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 ArXiv CMS PAS HIN RHIC & AGS Annual Users' Meeting

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

29 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 ArXiv RHIC & AGS Annual Users' Meeting

30 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

31 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

32 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

33 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

34 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

35 Outlook: Statistical Reach in 2015 and beyond
TeV PbPb data (0.15/nb) b-jet TeV pPb data (35/nb) B meson b-jet 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

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

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

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

39 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, (2007) arXiv: v2 RHIC & AGS Annual Users' Meeting 39

40 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

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

Similar presentations

417 th WE-Heraeus-Seminar Characterization of the Quark Gluon Plasma with Heavy Quarks Physikzentrum Bad Honnef June 25-28, 2008 Ralf Averbeck, Heavy-Flavor.

417 th WE-Heraeus-Seminar Characterization of the Quark Gluon Plasma with Heavy Quarks Physikzentrum Bad Honnef June 25-28, 2008 Ralf Averbeck, Heavy-Flavor.
Heavy flavor measurements with high-p T electrons in the ALICE EMCal Mark Heinz (for the ALICE Collaboration) Yale University 26 th Winter Workshop on.

Heavy flavor measurements with high-p T electrons in the ALICE EMCal Mark Heinz (for the ALICE Collaboration) Yale University 26 th Winter Workshop on.
Jet and Jet Shapes in CMS

Jet and Jet Shapes in CMS
1 Rare Decays of B Hadrons at CDF Matthew Jones October 3, 2005.

1 Rare Decays of B Hadrons at CDF Matthew Jones October 3, 2005.
Winter Workshop on Nuclear Dynamics, 2007 1 Heavy Ion Physics with CMS: Day-One Measurements Olga Barannikova for the CMS Collaboration.

Winter Workshop on Nuclear Dynamics, Heavy Ion Physics with CMS: Day-One Measurements Olga Barannikova for the CMS Collaboration.
Ali Hanks - APS 2008 1 Direct measurement of fragmentation photons in p+p collisions at √s = 200GeV with the PHENIX experiment Ali Hanks for the PHENIX.

Ali Hanks - APS Direct measurement of fragmentation photons in p+p collisions at √s = 200GeV with the PHENIX experiment Ali Hanks for the PHENIX.
Top Turns Ten March 2 nd, 2005. Measurement of the Top Quark Mass The Low Bias Template Method using Lepton + jets events Kevin Black, Meenakshi Narain.

Top Turns Ten March 2 nd, Measurement of the Top Quark Mass The Low Bias Template Method using Lepton + jets events Kevin Black, Meenakshi Narain.
Heavy Flavor Production at the Tevatron Jennifer Pursley The Johns Hopkins University on behalf of the CDF and D0 Collaborations Beauty 2006 - University.

Heavy Flavor Production at the Tevatron Jennifer Pursley The Johns Hopkins University on behalf of the CDF and D0 Collaborations Beauty University.
Cold Nuclear Matter Effects on Open Heavy Flavor at RHIC J. Matthew Durham for the PHENIX Collaboration Stony Brook University

Cold Nuclear Matter Effects on Open Heavy Flavor at RHIC J. Matthew Durham for the PHENIX Collaboration Stony Brook University
High-density QCD with CMS at the LHC Haidong Liu for the CMS Collaboration OutLine Detectors Overview Bulk Observables Hard Probes Summary.

High-density QCD with CMS at the LHC Haidong Liu for the CMS Collaboration OutLine Detectors Overview Bulk Observables Hard Probes Summary.
1 The CMS Heavy Ion Program Michael Murray Kansas.

1 The CMS Heavy Ion Program Michael Murray Kansas.
CMS / ATLAS production: quarkonia, cross section, correlations Valery P. Andreev University of California, Los Angeles on behalf of the CMS and ATLAS Collaborations.

CMS / ATLAS production: quarkonia, cross section, correlations Valery P. Andreev University of California, Los Angeles on behalf of the CMS and ATLAS Collaborations.
SQM2006, 03/27/2006Haibin Zhang1 Heavy Flavor Measurements at STAR Haibin Zhang Brookhaven National Laboratory for the STAR Collaboration.

SQM2006, 03/27/2006Haibin Zhang1 Heavy Flavor Measurements at STAR Haibin Zhang Brookhaven National Laboratory for the STAR Collaboration.
Sourav Tarafdar Banaras Hindu University For the PHENIX Collaboration Hard Probes 2012 Measurement of electrons from Heavy Quarks at PHENIX.

Sourav Tarafdar Banaras Hindu University For the PHENIX Collaboration Hard Probes 2012 Measurement of electrons from Heavy Quarks at PHENIX.
Xiaoyan LinQuark Matter 2006, Shanghai, Nov. 14-20, 2006 1 Study B and D Contributions to Non- photonic Electrons via Azimuthal Correlations between Non-

Xiaoyan LinQuark Matter 2006, Shanghai, Nov , Study B and D Contributions to Non- photonic Electrons via Azimuthal Correlations between Non-
Heavy charged gauge boson, W’, search at Hadron Colliders YuChul Yang (Kyungpook National University) (PPP9, NCU, Taiwan, June 04, 2011) June04, 2011,

Heavy charged gauge boson, W’, search at Hadron Colliders YuChul Yang (Kyungpook National University) (PPP9, NCU, Taiwan, June 04, 2011) June04, 2011,
Christof Roland Ions at FCC, Jan 29 2014 1 Prospects for jet measurements at HL-LHC with CMS Ions at the Future Hadron Collider Meeting 29 January 2014.

Christof Roland Ions at FCC, Jan Prospects for jet measurements at HL-LHC with CMS Ions at the Future Hadron Collider Meeting 29 January 2014.
1 OPEN HEAVY FLAVOUR PRODUCTION IN pp COLLISIONS WITH AT LHC Rosa Romita ( ) for the ALICE Collaboration.

1 OPEN HEAVY FLAVOUR PRODUCTION IN pp COLLISIONS WITH AT LHC Rosa Romita ( ) for the ALICE Collaboration.
B c Results from CDF II Satyajit Behari (For the CDF Collab.) Johns Hopkins Univ., Baltimore,USA 23 rd Jul. 2005 HEP2005 Europhysics Conference, Lisboa,

B c Results from CDF II Satyajit Behari (For the CDF Collab.) Johns Hopkins Univ., Baltimore,USA 23 rd Jul HEP2005 Europhysics Conference, Lisboa,
Single Electron Measurements at RHIC-PHENIX T. Hachiya Hiroshima University For the PHENIX Collaboration.

Single Electron Measurements at RHIC-PHENIX T. Hachiya Hiroshima University For the PHENIX Collaboration.

Similar presentations

Ads by Google