Quarkonia and open heavy flavor production at STAR

  • Slides: 23
Download presentation
Quarkonia and open heavy flavor production at STAR Hard Probes 2012 Cagliari, Sardinia, Italy.

Quarkonia and open heavy flavor production at STAR Hard Probes 2012 Cagliari, Sardinia, Italy. 30/May/2012 Manuel Calderón de la Barca Sánchez UC Davis STAR Collaboration

Outline S Heavy Quarkonia in medium S J/ψ S Transverse momentum spectra S pp

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

J/ψ in pp collisions, √s=200 Ge. V S Measured spectra from 0 to ~13

J/ψ in pp collisions, √s=200 Ge. V S Measured spectra from 0 to ~13 Ge. V. S Results consistent with other measurements. S Great S/B. Needed for polarization studies. S NNLO* CS misses high p. T part. S Phys. Rev. Lett. 98, 232301 (2007) JPG 37, 085104 (2010) Ar. Xiv: 1101. 1912 (2011) P. Artoisenet et al. , Phys. Rev. Lett. 101, 152001 (2008), and J. P. Lansberg private communication. S NLO CS+CO and CEM consistent with our data S CEM: M. Bedjidian et al. , hep-ph/0311048, and R. Vogt private comm. S NLO CS+CO, Wang et a. , PRD 84 114001 (2011) 30/May/2012 Manuel Calderón de la Barca Sánchez 3

J/ψ polarization S Measurement in 3 bins: S 2 -3, 3 -4, 4 -6

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

J/ψ in Au+Au collisions S High significance ~16 s signal. Phys. Rev. Lett. 98,

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

J/ψ RAA , Npart and p. T Y. Liu, et al. , PLB 678:

J/ψ RAA , Npart and p. T Y. Liu, et al. , PLB 678: 72 (2009), Tsingua U. X. Zhao and R. Rapp, PRC 82, 064905(2010) STAR Cu. Cu: PRC 80, 014922(R), PLB 678: 72 (2009), PRC 82, 064905 (2010) PHENIX: PRL 98, 232301 S Suppression increases with centrality. S Less suppression at high p. T. S In mid-central collisions, consistent with no suppression above p. T=5. 30/May/2012 Manuel Calderón de la Barca Sánchez 6

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

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

B feeddown contribution S B fraction: similar to previous measurements S Consistent with no

B feeddown contribution S B fraction: similar to previous measurements S Consistent with no energy dependence. S How much of our charm comes from our beauty? S B mesons carry 1025% of charmonium yield. c B 30/May/2012 Manuel Calderón de la Barca Sánchez 8

J/ψ Elliptic Flow S Sensitive to transport properties, and production mechanisms S Primordial/Initial S

J/ψ Elliptic Flow S Sensitive to transport properties, and production mechanisms S Primordial/Initial S p. QCD: isotropic in f. STAR Preliminary S Coalescence/Regeneration S Thermalized, flowing charm: large v 2 S Can light quarks move heavy quarks? light quark S J/ψ azimuthal anisotropy S v 2: consistent with zero for p. T>2 Ge. V/c. S Disfavors coalescence from thermalized charm quarks. S Need initially produced quarks for models to agree better with data. 30/May/2012 [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, 24 th WWND, 2008. (20~40 %) [5] Y. Liu, N. Xu, P. Zhuang, Nucl. Phy. A, 834, 317. (b=7. [6] U. Heinz, C. Shen, priviate communication. (20~60 %) Manuel Calderón de la Barca Sánchez 9

Go heavier! ϒ production S pp Collisions, Reference S 2009 data: ∫L dt ~

Go heavier! ϒ production S pp Collisions, Reference S 2009 data: ∫L dt ~ 20 /pb S N (total)= 145± 26(stat. ) data S 2006: ∫L dt = 7. 9 ± 0. 6 /pb S Improved statistics. S N (total)= 67± 22(stat. ) Phys. Rev. D 82 (2010) 12004 30/May/2012 Manuel Calderón de la Barca Sánchez 10

ϒ cross section in pp Phys. Rev. D 82 (2010) 12004 STAR Preliminary S

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

S Raw yield in|y|<0. 5 = 197 ± 36 S ∫L dt ≈ 1400

S Raw yield in|y|<0. 5 = 197 ± 36 S ∫L dt ≈ 1400 µb-1 Models from M. Strickland D. Bazow, ar. Xiv: 1112. 2761 v 4 Beauty in a hot, perfect liquid Talk by A. Kesich, Parallel V A. S RAA: Observation of Upsilon suppression. (Including 2009 pp Preliminary ds/dy) S Expect: Recombination: negligible, Hadronic co-mover absorption: negligible. Manuel Calderón de la Barca Sánchez 30/May/2012 12

ϒ model comparison S Incorporating lattice-based potentials, including real and imaginary parts S A:

ϒ model comparison S Incorporating lattice-based potentials, including real and imaginary parts S A: Free energy (disfavored), S B: Internal energy (consistent with data vs. Npart) S Includes sequential melting and feed-down contributions S Dynamical expansion, variations in initial conditions (T, η/S) S Data indicate: 428 < T 0 < 442 Me. V, 1 < 4 η/S <3 Manuel Calderón de la Barca Sánchez 30/May/2012 M. Strickland D. Bazow, ar. Xiv: 1112. 2761 v 4 13

Open Heavy Flavor K+ D 0 e-/ - l K + D 0 See

Open Heavy Flavor K+ D 0 e-/ - l K + D 0 See Talk by D. Tlusty, Parallel II A. 30/May/2012 Manuel Calderón de la Barca Sánchez 14

D 0 signal in pp S D 0 K S p+p 200 Ge. V

D 0 signal in pp S D 0 K S p+p 200 Ge. V S minimum bias 105 M ar. Xiv: 1204. 4244. S 4 -s signal observed. S Different methods to study combinatorial background. S Like Sign, Rotation S Consistent results from two background methods 30/May/2012 Manuel Calderón de la Barca Sánchez 15

D* meson in pp 200 Ge. V ar. Xiv: 1204. 4244. B. I. ~Abelev,

D* meson in pp 200 Ge. V ar. Xiv: 1204. 4244. B. I. ~Abelev, et al. , PRD 79 (2009) 112006. S 8 -s signal observed. S Background Reconstruction (2 methods) S Wrong sign: S D 0 and � -, D 0 and � + S Side band: S S 30/May/2012 1. 72< M(K� ) < 1. 80 or 1. 92 < M(K� ) < 2. 0 Ge. V/c 2 Manuel Calderón de la Barca Sánchez 16

Combine D 0 and D* D 0 scaled by Ncc / ND 0 =

Combine D 0 and D* D 0 scaled by Ncc / ND 0 = 1 / 0. 56 D* scaled by Ncc / ND* = 1 / 0. 22 Consistent with FONLL upper limit. ds/dy = d. N/dy|ccy=0 × F × spp F = 4. 7 ± 0. 7 scale to full rapidity. spp(NSD) = 30 mb Fragmentation fractions: PDG, PLB 667 (2008 FONLL: M. Cacciari et al. , PRL 95 (2005) 122 ar. Xiv: 1204. 4244. STAR Preliminary S Charm cross section at midrapidity S Charm total cross section See Talk by D. Tlusty, Monday Parallel II A. 30/May/2012 Manuel Calderón de la Barca Sánchez 17

D 0 signal in Au+Au Yi. Fei Zhang, JPG 38, 124142 (201 S Year

D 0 signal in Au+Au Yi. Fei Zhang, JPG 38, 124142 (201 S Year 2010 minimum bias 0 -80% 280 M Au+Au 200 Ge. V events. S 8 -s signal observed. S Mass = 1863 ± 2 Me. V (PDG value is 1864. 5 ± 0. 4 Me. V) S Width = 12 ± 2 Me. V 30/May/2012 Manuel Calderón de la Barca Sánchez 18

Charm cross section compilation All of the measurements show similar s. Year 2003 d+Au

Charm cross section compilation All of the measurements show similar s. Year 2003 d+Au : D 0 + e Year 2009 p+p : D 0 + D* Year 2010 Au+Au: D 0 Assuming ND 0 / Ncc = 0. 56 does not change. Charm cross section in Au+Au 200 Ge. V: Mid-rapidity: 186 ± 22 (stat. ) ± 30 (sys. ) ± 18 (norm. ) mb Total cross section: 876 ± 103 (stat. ) ± 211 (sys. ) mb S Charm cross section follows number of binary collisions scaling => S Charm quarks are mostly produced via initial hard scatterings from pp to Au. 30/May/2012 Manuel Calderón de la Barca Sánchez 19

Charm excitation function 500 Ge. V pp, Minimum bias S Charm data: help constrain

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

Charm RAA via D 0 s and NPE STAR, PRL 98 (2007) 192301 S

Charm RAA via D 0 s and NPE STAR, PRL 98 (2007) 192301 S At RHIC, NPE is our way to study S STAR D mesons at low p. T : consistent with binary scaling S ALICE: D meson suppressed at high p. T charm and bottom production & quenching. S Recall: NPE are suppressed at high p. T. S D 0 measurement at low p. T. S STAR upgrades: improved charm measurements More central selection than STAR 30/May/2012 S ar. Xiv: 1203. 2160 Manuel Calderón de la Barca Sánchez S 21

Non-photonic electron v 2 S Mid central collisions: Indications that Non-photonic electrons have finite

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

Conclusions and Summary S Heavy Quarks: great tool to study the Quark Gluon Plasma.

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

OPEN HEAVY FLAVORS 1 Heavy Flavor Heavy quarksOPEN HEAVY FLAVORS 1 Heavy Flavor Heavy quarks
OPEN HEAVY FLAVORS 1 Heavy Flavor Heavy quarksOPEN HEAVY FLAVORS 1 Heavy Flavor Heavy quarks
Heavy Flavor Physics in HIC with STAR HeavyHeavy Flavor Physics in HIC with STAR Heavy
Heavy Flavor Physics in HIC with STAR HeavyHeavy Flavor Physics in HIC with STAR Heavy
Heavy Flavor Production and Interactions in Relativistic HeavyHeavy Flavor Production and Interactions in Relativistic Heavy
STAR HFT The STAR Heavy Flavor Tracker PXLSTAR HFT The STAR Heavy Flavor Tracker PXL
Measurement of Heavy Flavor Production in STAR ExperimentMeasurement of Heavy Flavor Production in STAR Experiment
Heavy Quarks and Heavy Quarkonia as Tests ofHeavy Quarks and Heavy Quarkonia as Tests of
Heavy Quarks and Heavy Quarkonia as Tests ofHeavy Quarks and Heavy Quarkonia as Tests of
Relativistic Heavy Ion Physics Heavy Quarks and QuarkoniaRelativistic Heavy Ion Physics Heavy Quarks and Quarkonia
Discussion session on heavy quarks and heavy quarkoniaDiscussion session on heavy quarks and heavy quarkonia
J Heaviness of Heavy Quarkonia in Heavy IonJ Heaviness of Heavy Quarkonia in Heavy Ion
Open heavy flavor production in pp collisions inOpen heavy flavor production in pp collisions in
Open Heavy Flavor Production in pp d AuOpen Heavy Flavor Production in pp d Au
Recent measurements of open heavy flavor production byRecent measurements of open heavy flavor production by
Studying Heavy Flavor Production at RHIC via OpenStudying Heavy Flavor Production at RHIC via Open
Implications for quarkonia Quarkonia dissolve from Cold NuclearImplications for quarkonia Quarkonia dissolve from Cold Nuclear
Production of heavy quarks and quarkonia at LHCbProduction of heavy quarks and quarkonia at LHCb
Heavy quarkonia production in pp dA and AAHeavy quarkonia production in pp dA and AA
Central exclusive production of heavy quarkonia and charmoniumlikeCentral exclusive production of heavy quarkonia and charmoniumlike
Heavy Quark Mass in PQCD and Heavy FlavorHeavy Quark Mass in PQCD and Heavy Flavor
LHC results on open heavy quarks and quarkoniaLHC results on open heavy quarks and quarkonia