Presentation is loading. Please wait.

Presentation is loading. Please wait.

Manuel Calderón de la Barca Sánchez UC Davis STAR Collaboration Hard Probes 2012 Cagliari, Sardinia, Italy. 30/May/2012.

Published byLorin Hamilton Modified over 9 years ago

Similar presentations

Presentation on theme: "Manuel Calderón de la Barca Sánchez UC Davis STAR Collaboration Hard Probes 2012 Cagliari, Sardinia, Italy. 30/May/2012."— Presentation transcript:

1 Manuel Calderón de la Barca Sánchez UC Davis STAR Collaboration Hard Probes 2012 Cagliari, Sardinia, Italy. 30/May/2012

2 Outline  Heavy Quarkonia in medium  J/ ψ  Transverse momentum spectra  pp collisions: compare to production  AuAu: Probe of the medium  R AA, Elliptic Flow v 2  ϒ production: A cleaner probe of the medium.  pp, Au+Au. Baseline, hot nuclear matter effects.  Open Heavy Flavor  Direct D meson reconstruction  Non-photonic electrons 30/May/2012 Manuel Calderón de la Barca Sánchez 2

3 J/ ψ in pp collisions, √s=200 GeV 30/May/2012 Manuel Calderón de la Barca Sánchez 3 Phys. Rev. Lett. 98, 232301 (2007) JPG 37, 085104 (2010) ArXiv:1101.1912 (2011)  Measured spectra from 0 to ~13 GeV.  Results consistent with other measurements.  Great S/B. Needed for polarization studies.  NNLO* CS misses high p T part.  P. Artoisenet et al., Phys. Rev. Lett. 101, 152001 (2008), and J.P. Lansberg private communication.  NLO CS+CO and CEM consistent with our data  CEM: M. Bedjidian et al., hep-ph/0311048, and R. Vogt private comm.  NLO CS+CO, Wang et a., PRD 84 114001 (2011)

4 J/ ψ polarization  Measurement in 3 bins:  2-3, 3-4, 4-6 GeV/c  Observed polarization is not large  Consistent with zero within errors.  Consistent with both CSM and COM predictions 30/May/2012 Manuel Calderón de la Barca Sánchez 4 PHENIX: Phys. Rev. D 82, 012001 (2010) COM: Phys. Rev. D 81, 014020 (2010) CSM NLO+: Phys. Lett. B, 695, 149 (2011) STAR Preliminary

5 J/ ψ in Au+Au collisions  High significance ~16  signal.  High-tower trigger: Extend p T reach to 10 GeV.  Consistent with previous measurements in the lower p T region.  TBW comparison: no radial flow? 30/May/2012 Manuel Calderón de la Barca Sánchez 5 Phys. Rev. Lett. 98, 232301 (2007) JPG 37, 085104 (2010)

6 J/ ψ R AA, Npart and p T  Suppression increases with centrality.  Less suppression at high p T.  In mid-central collisions, consistent with no suppression above p T =5. 30/May/2012 Manuel Calderón de la Barca Sánchez 6 STAR CuCu: PRC80, 014922(R), PLB 678:72 (2009), PRC 82, 064905 (2010) PHENIX: PRL98, 232301 Y. Liu, et al., PLB 678:72 (2009), Tsingua U. X. Zhao and R.Rapp, PRC 82, 064905(2010)

7 J/ ψ -hadron correlation  Near-side contribution: Sensitive to B-feeddown 30/May/2012 Manuel Calderón de la Barca Sánchez 7

8 B feeddown contribution  B fraction: similar to previous measurements  Consistent with no energy dependence.  How much of our charm comes from our beauty?  B mesons carry 10-25% of charmonium yield. 30/May/2012 Manuel Calderón de la Barca Sánchez 8 B c

9 J/ ψ Elliptic Flow  Sensitive to transport properties, and production mechanisms  Primordial/Initial  pQCD: isotropic in .  Coalescence/Regeneration  Thermalized, flowing charm: large v2  Can light quarks move heavy quarks?  J/ ψ azimuthal anisotropy  v 2 : consistent with zero for p T >2 GeV/c.  Disfavors coalescence from thermalized charm quarks.  Need initially produced quarks for models to agree better with data. 30/May/2012 Manuel Calderón de la Barca Sánchez 9 light quark [1] V. Greco, C.M. Ko, R. Rapp, PLB 595, 202. (minbias) [2] L. Ravagli, R. Rapp, PLB 655, 126. (minbias) [3] L. Yan, P. Zhuang, N. Xu, PRL 97, 232301. (b=7.8 fm) [4] X. Zhao, R. Rapp, 24th WWND, 2008. (20~40 %) [5] Y. Liu, N. Xu, P. Zhuang, Nucl. Phy. A, 834, 317. (b=7.8 fm) [6] U. Heinz, C. Shen, priviate communication. (20~60 %) STAR Preliminary

10 Go heavier! ϒ production  pp Collisions, Reference data  2006: ∫L dt = 7.9 ± 0.6 /pb  N  (total)= 67±22(stat.) 30/May/2012 Manuel Calderón de la Barca Sánchez 10 Phys. Rev. D 82 (2010) 12004  2009 data: ∫L dt ~ 20 /pb  N  (total)= 145±26(stat.)  Improved statistics.

11 ϒ cross section in pp  ϒ (1S+2S+3S) cross section: consistent with NLO pQCD.  Good reference for studying nuclear effects. 30/May/2012 Manuel Calderón de la Barca Sánchez 11 Talk by A. Kesich, Parallel V A. Phys. Rev. D 82 (2010) 12004 STAR Preliminary

12 Beauty in a hot, perfect liquid  Raw yield in|y|<0.5 = 197 ± 36  ∫L dt ≈ 1400 µb -1  R AA : Observation of Upsilon suppression. (Including 2009 pp Preliminary d  /dy)  Expect: Recombination: negligible, Hadronic co-mover absorption: negligible.  Suppression observation: sensitive to deconfinement effects! 30/May/2012 Manuel Calderón de la Barca Sánchez 12 Talk by A. Kesich, Parallel V A. Models from M. Strickland and D. Bazow, arXiv:1112.2761v4

13 ϒ model comparison  Incorporating lattice-based potentials, including real and imaginary parts  A: Free energy (disfavored),  B: Internal energy (consistent with data vs. N part )  Includes sequential melting and feed-down contributions  Dynamical expansion, variations in initial conditions (T, η /S)  Data indicate: 428 < T 0 < 442 MeV, 1 < 4  η /S < 3 30/May/2012 Manuel Calderón de la Barca Sánchez 13 M. Strickland and D. Bazow, arXiv:1112.2761v4

14 Open Heavy Flavor See Talk by D. Tlusty, Parallel II A. 30/May/2012 Manuel Calderón de la Barca Sánchez 14 D0D0 K+K+  l K-K- e-/-e-/- D0D0

15 D 0 signal in pp  D 0  K   p+p 200 GeV  minimum bias 105 M  4-  signal observed.  Different methods to study combinatorial background.  Like Sign, Rotation  Consistent results from two background methods 30/May/2012 Manuel Calderón de la Barca Sánchez 15 arXiv:1204.4244.

16 D* meson in pp 200 GeV  8-  signal observed.  Background Reconstruction (2 methods)  Wrong sign:  D0 and  -, D0 and  +  Side band:  1.72< M(K  ) < 1.80 or  1.92 < M(K  ) < 2.0 GeV/c 2 30/May/2012 Manuel Calderón de la Barca Sánchez 16 arXiv:1204.4244. B.I.~Abelev, et al., PRD 79 (2009) 112006.

17 Combine D0 and D*  Charm cross section at midrapidity  Charm total cross section 30/May/2012 Manuel Calderón de la Barca Sánchez 17 D 0 scaled by N cc / N D0 = 1 / 0.56 D* scaled by N cc / N D* = 1 / 0.22 Consistent with FONLL upper limit. d  /dy = dN/dy| cc y=0 × F ×  pp F = 4.7 ± 0.7 scale to full rapidity.  pp (NSD) = 30 mb Fragmentation fractions: PDG, PLB 667 (2008) 1 FONLL: M. Cacciari et al., PRL 95 (2005) 122001 arXiv:1204.4244. STAR Preliminary See Talk by D. Tlusty, Monday Parallel II A.

18 D 0 signal in Au+Au  Year 2010 minimum bias 0-80% 280M Au+Au 200 GeV events.  8-  signal observed.  Mass = 1863 ± 2 MeV (PDG value is 1864.5 ± 0.4 MeV)  Width = 12 ± 2 MeV 30/May/2012 Manuel Calderón de la Barca Sánchez 18 YiFei Zhang, JPG 38, 124142 (2011)

19 Charm cross section compilation  Charm cross section follows number of binary collisions scaling =>  Charm quarks are mostly produced via initial hard scatterings from pp to AuAu. 30/May/2012 Manuel Calderón de la Barca Sánchez 19 All of the measurements show similar . Year 2003 d+Au : D 0 + e Year 2009 p+p : D 0 + D* Year 2010 Au+Au: D 0 Assuming N D0 / N cc = 0.56 does not change. Charm cross section in Au+Au 200 GeV: Mid-rapidity: 186 ± 22 (stat.) ± 30 (sys.) ± 18 (norm.)  b Total cross section: 876 ± 103 (stat.) ± 211 (sys.)  b

20 Charm excitation function  Charm data: help constrain pQCD calculations.  500 GeV pp data coming soon. 30/May/2012 Manuel Calderón de la Barca Sánchez 20 500 GeV pp, Minimum bias See Talk by D. Tlusty, Monday Parallel II A.

21 Charm R AA via D 0 s and NPE  At RHIC, NPE is our way to study high p T charm and bottom production & quenching.  Recall: NPE are suppressed at high p T.  D0 measurement at low p T.  STAR upgrades: improved charm measurements 30/May/2012 Manuel Calderón de la Barca Sánchez 21 STAR, PRL 98 (2007) 192301  STAR D mesons at low p T : consistent with binary scaling  ALICE: D meson suppressed at high p T.  More central selection than STAR  arXiv:1203.2160

22 Non-photonic electron v 2  Mid central collisions: Indications that Non-photonic electrons have finite v 2  See Talk by O. Hájková. Parallel IV A 30/May/2012 Manuel Calderón de la Barca Sánchez 22

23 Conclusions and Summary  Heavy Quarks : great tool to study the Quark Gluon Plasma.  J/ ψ suppression decreases at high p T.  J/ ψ v 2 : consistent with zero.  Disfavors a dominant coalescence contribution for p T >2 GeV  J/ ψ -h: B fraction, not a significant √s dependence  ϒ production cross section and hot nuclear effects  ϒ in Au+Au: suppression  Probe of deconfinement.  Access medium properties, e.g.  428 < T 0 < 442 MeV  Open Charm: D 0 and D* measurements  Production consistent with FONLL calculations  For all systems: p+p, d+Au and Au+Au  Low p T R AA : consistent with no suppression  Suppression at higher p T, e.g. High p T NPE. 30/May/2012 Manuel Calderón de la Barca Sánchez 23

Download ppt "Manuel Calderón de la Barca Sánchez UC Davis STAR Collaboration Hard Probes 2012 Cagliari, Sardinia, Italy. 30/May/2012."

Similar presentations

Heavy flavor production in STAR. What can charm and beauty tell us about matter in heavy ion collisions? Manuel Calderón de la Barca Sánchez UC Davis for.

Heavy flavor production in STAR. What can charm and beauty tell us about matter in heavy ion collisions? Manuel Calderón de la Barca Sánchez UC Davis for.
Aug. 10-15, 2005, XXXV ISMD, Czech X.Dong, USTC 1 Open charm production at RHIC Xin Dong University of Science and Technology of China - USTC  Introduction.

Aug , 2005, XXXV ISMD, Czech X.Dong, USTC 1 Open charm production at RHIC Xin Dong University of Science and Technology of China - USTC  Introduction.
STAR Heavy Flavor Measurements in Heavy- ion Collisions 1 Outline :  Quarkonia Measurements in  p+p, d+Au and Au+Au collisions  Open Charm Measurement.

STAR Heavy Flavor Measurements in Heavy- ion Collisions 1 Outline :  Quarkonia Measurements in  p+p, d+Au and Au+Au collisions  Open Charm Measurement.
Fukutaro Kajihara (CNS, University of Tokyo) for the PHENIX Collaboration Heavy Quark Measurements by Weak-Decayed Electrons at RHIC-PHENIX.

Fukutaro Kajihara (CNS, University of Tokyo) for the PHENIX Collaboration Heavy Quark Measurements by Weak-Decayed Electrons at RHIC-PHENIX.
ISMD’05, Kromeriz, Aug 09  15, 2005 1 Heavy  Flavor (c,b) Collectivity – Light  Flavor (u,d,s) Thermalization at RHIC Kai Schweda, University of Heidelberg.

ISMD’05, Kromeriz, Aug 09  15, Heavy  Flavor (c,b) Collectivity – Light  Flavor (u,d,s) Thermalization at RHIC Kai Schweda, University of Heidelberg.
Charm & bottom RHIC Shingo Sakai Univ. of California, Los Angeles 1.

Charm & bottom RHIC Shingo Sakai Univ. of California, Los Angeles 1.
K*(892) Resonance Production in Au+Au and Cu+Cu Collisions at  s NN = 200 GeV & 62.4 GeV Motivation Analysis and Results Summary 1 Sadhana Dash Institute.

K*(892) Resonance Production in Au+Au and Cu+Cu Collisions at  s NN = 200 GeV & 62.4 GeV Motivation Analysis and Results Summary 1 Sadhana Dash Institute.
Probing Properties of the QCD Medium via Heavy Quark Induced Hadron Correlations Huan Zhong Huang Department of Physics and Astronomy University of California.

Probing Properties of the QCD Medium via Heavy Quark Induced Hadron Correlations Huan Zhong Huang Department of Physics and Astronomy University of California.
Upsilon Production in Heavy Ions with STAR and CMS

Upsilon Production in Heavy Ions with STAR and CMS
Jet-like correlations of heavy-flavor particles - From RHIC to LHC

Jet-like correlations of heavy-flavor particles - From RHIC to LHC
03/14/2006WWND2006 at La Jolla1 Identified baryon and meson spectra at intermediate and high p T in 200 GeV Au+Au Collisions Outline: Motivation Intermediate.

03/14/2006WWND2006 at La Jolla1 Identified baryon and meson spectra at intermediate and high p T in 200 GeV Au+Au Collisions Outline: Motivation Intermediate.
1 Zhangbu Xu Brookhaven National Laboratory Quarkonium measurements with STAR Outline: High-p T J/ results J/spectrum and flow J/h correlations The.

1 Zhangbu Xu Brookhaven National Laboratory Quarkonium measurements with STAR Outline: High-p T J/ results J/spectrum and flow J/h correlations The.
 production in p+p collisions in Manuel Calderón de la Barca Sánchez UC Davis STAR Collaboration 23 d Winter Workshop on Nuclear Dynamics Big Sky, Montana.

 production in p+p collisions in Manuel Calderón de la Barca Sánchez UC Davis STAR Collaboration 23 d Winter Workshop on Nuclear Dynamics Big Sky, Montana.
Upsilon production in STAR Pibero Djawotho Indiana University Cyclotron Facility October 12, 2007 DNP 2007.

Upsilon production in STAR Pibero Djawotho Indiana University Cyclotron Facility October 12, 2007 DNP 2007.
Non-photonic electron production in STAR A. G. Knospe Yale University 9 April 2008.

Non-photonic electron production in STAR A. G. Knospe Yale University 9 April 2008.
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.
Identified Particle Ratios at large p T in Au+Au collisions at  s NN = 200 GeV Matthew A. C. Lamont for the STAR Collaboration - Talk Outline - Physics.

Identified Particle Ratios at large p T in Au+Au collisions at  s NN = 200 GeV Matthew A. C. Lamont for the STAR Collaboration - Talk Outline - Physics.
Measurements of  Production and Nuclear Modification Factor at STAR Anthony Kesich University of California, Davis STAR Collaboration.

Measurements of  Production and Nuclear Modification Factor at STAR Anthony Kesich University of California, Davis STAR Collaboration.
1 J/ψ production in relativistic p+p, d+A and A+A collisions at RHIC, measured by the PHENIX experiment Hugo Pereira Da Costa, for the PHENIX collaboration.

1 J/ψ production in relativistic p+p, d+A and A+A collisions at RHIC, measured by the PHENIX experiment Hugo Pereira Da Costa, for the PHENIX collaboration.
Quarkonium Workshop, BNL, June 6-18, 2011 1 Zebo USTC Zebo Tang (for the STAR Collaboration) University of Science and Technology of China (USTC)

Quarkonium Workshop, BNL, June 6-18, Zebo USTC Zebo Tang (for the STAR Collaboration) University of Science and Technology of China (USTC)

Similar presentations

Ads by Google