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PHENIX Highlights

PHENIX Highlights. Stefan Bathe, QM2011. Measuring the Properties of the QGP. Conditions. Properties. Screening length .  . T i.  / s. d E / d x. CNM effects. Initial State. What I will show you today. v 2 of thermal direct photons Constrains T i and t 0

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PHENIX Highlights

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  1. PHENIX Highlights Stefan Bathe, QM2011

  2. Measuring the Properties of the QGP Conditions Properties Screening length  Ti /s dE/dx CNM effects Initial State Stefan Bathe for PHENIX, QM2011

  3. What I will show you today • v2 of thermal direct photons • Constrains Tiand t0 • CNM effects in d+Au • Density dependence of shadowing from J/y • Reconstructed jets • Low-x suppression from forward di-hadron correlations • v3 • Disentangle initial state from h/s • Implications for 2-particle correlations • E loss • Path-length dependence • Results from energy scan Stefan Bathe for PHENIX, QM2011

  4. Measuring the Properties of the QGP Conditions Properties Screening length  ~ 0 Ti /s dE/dx CNM effects Initial State Stefan Bathe for PHENIX, QM2011

  5. Measuring the Properties of the QGP Conditions Properties Screening length  ~ 0 Ti /s dE/dx CNM effects Initial State Stefan Bathe for PHENIX, QM2011

  6. Direct Photon Excess in Au+Au NLO Vogelsang √sNN = 200 GeV yield p+p PRL 104, 132301 (2010) Stefan Bathe for PHENIX, QM2011

  7. Direct Photon Excess in Au+Au • Direct photon excess above p+p spectrum • Exponential (consistent with thermal) • Inverse slope = 220 ± 20 MeV • Ti from hydro • 300 . . . 600 MeV • Depending on thermalization time NLO Vogelsang √sNN = 200 GeV Au+Au min. bias yield p+p PRL 104, 132301 (2010) Stefan Bathe for PHENIX, QM2011

  8. Critical d+Au Check • New: • no exponential excess in d+Au • Poster: Y. Yamaguchi Stefan Bathe for PHENIX, QM2011

  9. Direct photon v2 further constrains Ti • expected v2 : • prompt photons: 0 (time zero) • thermal photons Hydro after t0 early late • small • (flow not built up) • large • (like hadrons) Chatterjee, Srivastava PRC79, 021901 (2009) Stefan Bathe for PHENIX, QM2011

  10. Direct Photon v2 Statistical subtraction inclusive photon v2 - decay photon v2 = direct photon v2 Au+Au@200 GeV minimum bias preliminary • inclusive photon v2 Stefan Bathe for PHENIX, QM2011

  11. Direct Photon v2 • p0v2 similar to inclusive photon v2 • Two possibilities • A: there are no direct photons • B: direct photon v2 similar to inclusive photon v2 • Key: precise measurement of direct photon excess Au+Au@200 GeV minimum bias preliminary • p0v2 • inclusive photon v2 Stefan Bathe for PHENIX, QM2011

  12. Direct Photon v2 Au+Au@200 GeV minimum bias • direct photon v2 large (~15 %) at pT =2.5 GeV • v2  0 where prompt photons dominate Direct photon v2 preliminary Stefan Bathe for PHENIX, QM2011

  13. Theory Comparison: Direct Photon v2 Theory calculation: Holopainen, Räsänen, Eskola arXiv:1104.5371v1 preliminary • Models under-predict direct photon v2 • Measurement further constrains Tiandti • Challenge to theorists • Plenary: S. Esumi (flow), Tue • Parallel: E. Kistenev (direct photons) Thu Stefan Bathe for PHENIX, QM2011

  14. Measuring the Properties of the QGP Conditions Properties Screening length  ~ 0 Ti =300-600 MeV /s dE/dx CNM effects Initial State Stefan Bathe for PHENIX, QM2011

  15. Measuring the Properties of the QGP Conditions Properties Screening length  ~ 0 Ti =300-600 MeV /s dE/dx CNM effects Initial State Stefan Bathe for PHENIX, QM2011

  16. Cold Nuclear Matter Effects • Important for interpretation of HI data • Measure Cold Nuclear Matter (CNM) effects in d+Au collisions • RHIC versatile • Can collide any nuclear species on any other Stefan Bathe for PHENIX, QM2011

  17. J/y in d+Au: Shadowing non-linear • EPS09 shadowing with linear dependence on nuclear thickness matches for central collisions • Overpredicts suppression for peripheral collisions • RCP shows this clearly • Thickness (impact parameter) dependence of shadowing is non-linear! arXiv:1010.1246 1010.1246 • Plenary: C. Luiz da Silva (heavy flavor), Fri • Parallel: A. Sen (quarkonia) Tue Theory calculations: Eskola, Paukkunen, Salgado, JHEP04, 065 Vogt, PRC71, 054902 Kharzeev , Tuchin, NPA770, 40 Kharzeev ,Tuchin, NPA735, 248 Stefan Bathe for PHENIX, QM2011

  18. Reconstructed Jets in d+Au Stefan Bathe for PHENIX, QM2011

  19. Reconstructed Jets in d+Au at the p+p uncorrected scale • Jet Rcp in central d+Au modified • - caution: this is not RdA! • consistent with p0Rcp • anti-shadowing? • Parallel: N. Grau (gamma-hadron, jets) Tue • Poster: D. Perepelitsa (jets in dAu)

  20. Forward di-hadroncorrelations Color Glass Condensate? new forward EM calorimeter |h| = 3.0-3.8 Pocket formula: Stefan Bathe for PHENIX, QM2011

  21. Initial state low-x gluon suppression Di-hadron suppression factor peripheral central smaller x Stefan Bathe for PHENIX, QM2011

  22. Initial state low-x gluon suppression • Di-hadrons suppressed at low x • Important for interpretation of HI results Di-hadron suppression factor peripheral central smaller x • Parallel: M. Chiu (small x dAucorrel) Thu • Poster: Z. Citron (small x dAu correlations) Stefan Bathe for PHENIX, QM2011

  23. Measuring the Properties of the QGP Conditions Properties Screening length  ~ 0 • Ti =300-600 MeV /s dE/dx non-linear shadowing low-x suppression anti-shadowing? CNM effects Initial State Stefan Bathe for PHENIX, QM2011

  24. Measuring the Properties of the QGP Conditions Properties Screening length  ~ 0 • Ti =300-600 MeV /s dE/dx non-linear shadowing low-x suppression anti-shadowing? CNM effects Initial State Stefan Bathe for PHENIX, QM2011

  25. Initial State determines flow strength Glauber CGC Radial gluon distribution 2-D density profile Initial state determines v2 strength (largest uncertainty) Smaller eccentricity larger eccentricity Disentangle initial conditions from flow strength Stefan Bathe for PHENIX, QM2011

  26. v3 has fluctuations origin arXiv:1105.3928 arXiv:1105.3928 central: v3 = v2 mid-central: v3 < v2 weak centrality dependence of v3 => fluctuations origin Stefan Bathe for PHENIX, QM2011

  27. v3disentangles initial state and /s v2 described by Glauber and CGC Theory calculation: Alver et al. PRC82,034913   arXiv:1105.3928 • Glauber • Glauber initial state • /s = 1/4p • KLN • CGC initial state • /s = 2/4p Two models Stefan Bathe for PHENIX, QM2011

  28. v3disentangles initial state and /s v2 described by Glauber and CGC • v3 described only by Glauber Theory calculation: Alver et al. PRC82,034913   arXiv:1105.3928 arXiv:1105.3928 Theory calculation: Alver et al. PRC82,034913   Lappi, Venugopalan, PRC74, 054905 Drescher, Nara, PRC76, 041903 • Glauber • Glauber initial state • /s = 1/4p • MC-KLN • CGC initial state • /s = 2/4p Two models Stefan Bathe for PHENIX, QM2011

  29. v3disentangles initial state and /s v2 described by Glauber and CGC • v3 described only by Glauber Theory calculation: Alver et al. PRC82,034913   arXiv:1105.3928 arXiv:1105.3928 Theory calculation: Alver et al. PRC82,034913   Lappi, Venugopalan, PRC74, 054905 Drescher, Nara, PRC76, 041903 favored • Glauber • Glauber initial state • /s = 1/4p • MC-KLN • CGC initial state • /s = 2/4p Two models Stefan Bathe for PHENIX, QM2011 • Plenary: S. Esumi, Tue • Parallel: R. Lacey (v3, jet shape) Mon

  30. v3 explains double-hump correction • v2 correction only • double-hump Stefan Bathe for PHENIX, QM2011

  31. v3 explains double-hump correction correction • v2 correction only • double-hump • v2, v3, v4 correction • double-hump disappeared • Peak still broadened • Plenary: S. Esumi, Tue • Parallel: R. Lacey (v3, jet shape) Mon Stefan Bathe for PHENIX, QM2011

  32. Measuring the Properties of the QGP Conditions Properties Screening length  ~ 0 ? • Ti =300-600 MeV /s1/4p dE/dx non-linear shadowing low-x suppression anti-shadowing? CNM effects Initial State Glauber ? ? Stefan Bathe for PHENIX, QM2011

  33. Measuring the Properties of the QGP Conditions Properties Screening length  ~ 0 • Ti =300-600 MeV /s1/4p dE/dx non-linear shadowing low-x suppression anti-shadowing? CNM effects Initial State Glauber ? Stefan Bathe for PHENIX, QM2011

  34. Path-length dependence of E loss v2 not explained by pQCD (even with fluctuations & saturation) pQCD PRL 105, 142301 pQCD AdS/CFT Theory calculations: Wicks et al., NPA784, 426 Marquet, Renk, PLB685, 270 Drees, Feng, Jia, PRC71, 034909 Jia, Wei, arXiv:1005.0645 RAA explained by both models

  35. Path-length dependence of E loss V2 explained by cubic path length dependence (AdS/CFT) v2 not explained by pQCD (even with fluctuations & saturation) AdS/CFT pQCD PRL 105, 142301 pQCD AdS/CFT Theory calculations: Wicks et al., NPA784, 426 Marquet, Renk, PLB685, 270 Drees, Feng, Jia, PRC71, 034909 Jia, Wei, arXiv:1005.0645 RAA explained by both models

  36. Path-length dependence of E loss v2explained by cubic path length dependence (like AdS/CFT) v2 not explained by pQCD (even with fluctuations & saturation) AdS/CFT pQCD PRL 105, 142301 pQCD AdS/CFT Theory calculations: Wicks et al., NPA784, 426 Marquet, Renk, PLB685, 270 Drees, Feng, Jia, PRC71, 034909 Jia, Wei, arXiv:1005.0645 RAA explained by both models

  37. Path-length dependence of E loss v2explained by cubic path length dependence (like AdS/CFT) v2 not explained by pQCD (even with fluctuations & saturation) AdS/CFT pQCD v2 data favors dE/dx ~ l3(like AdS/CFT) PRL 105, 142301 pQCD AdS/CFT Theory calculations: Wicks et al., NPA784, 426 Marquet, Renk, PLB685, 270 Drees, Feng, Jia, PRC71, 034909 Jia, Wei, arXiv:1005.0645 • Plenary: M. Purschke (R_AA) Wen • Parallel: N. Grau (gamma-hadron, jets) Tue • Parallel: D. Sharma (light vector mesons) Mon • Poster: M. Tannenbaum (E loss RHIC vs. LHC) RAA explained by both models

  38. g-h: fragmentation function in Au+Au • p+p consistent with e++e- • Au+Au consistent with E loss model Tasso: Braunschweig et al. , Z. Phys. 320 C47, 187 MLA: Borghini, Wiedemann, hep-ph/0506218 hadrons g • Parallel: N. Grau (gamma-hadron, jets) Tue • Poster: M. Tannenbaum (E loss RHIC vs. LHC) Stefan Bathe for PHENIX, QM2011

  39. Measuring the Properties of the QGP Conditions Properties Screening length  ~ 0 ? • Ti =300-600 MeV /s1/4p dE/dx l3 non-linear shadowing low-x suppression anti-shadowing? CNM effects Initial State Glauber ? Stefan Bathe for PHENIX, QM2011

  40. Measuring the Properties of the QGP Conditions Properties Screening length  ~ 0 ? • Ti =300-600 MeV /s1/4p dE/dx  l3 non-linear shadowing low-x suppression anti-shadowing? CNM effects Initial State Glauber ? Stefan Bathe for PHENIX, QM2011

  41. v2, v3, v4independence of sNN(for 39, 62, 200 GeV) v2, v3, v4independence of sNNfor 39, 62.4, 200 GeV Just like at 200 GeV, disentangle initial state and /s Stefan Bathe for PHENIX, QM2011

  42. v2 saturation with sNN v2 saturation 39 GeV Preliminary, STAR, PHENIX and E895 data ALICE pT = 1.7 GeV pT = 0.7 GeV • Plenary: S. Esumi, Tue • Parallel: R. Lacey (v3, jet shape) Mon • Parallel: X. Gong (energy scan: bulk) Fri • Poster: S. Mizuno (PID v3) [PHENIX] Phys.Rev.Lett.94:232302,2005 Need updated plot from Arkadij 103 104 Stefan Bathe for PHENIX, QM2011

  43. sNN dependence of energy loss preliminary PRL101, 232301 • Plenary: M. Purschke (R_AA) Wen • Parallel: N. Novitsky (energy scan) Fri • Poster: O. Chvala (RAA in 39 and 62 GeV) • RAAsuppressed also at 39 GeV • RAA at 62 GeV approaches 200 GeV level at high pT Stefan Bathe for PHENIX, QM2011

  44. Measuring the Properties of the QGP Conditions Properties Screening length  ~ 0 ? • Ti =300-600 MeV /s1/4p dE/dx  l3 non-linear shadowing low-x suppression anti-shadowing? CNM effects Initial State Glauber ? Stefan Bathe for PHENIX, QM2011

  45. Near-Term Future: Silicon Vertex Detector • VTX successfully commissioned in 2011 p+p run • VTX taking data in Au+Au now! • RAA of c, b separately • v2 of c, b separately • Jet tomography (di-hadron, g-h, c-h, c-c) Status Data: p+p@500 GeV, 2011 beam profile s ~ 100mm Physics - Stefan Bathe for PHENIX, QM2011

  46. Near-Term Future: Silicon Vertex Detector • VTX successfully commissioned in 2011 p+p run • VTX taking data in Au+Au now! • RAA of c, b separately • v2 of c, b separately • Jet tomography (di-hadron, g-h, c-h, c-c) Status Data: Au+Au@200 GeV, 2011 beam profile s ~ 100mm • Parallel: A. Sickles (Decadal Plan) Thu • Poster: M. Chiu (Fast TOF, 10 ps) • Poster: M. Kurosawa (VTX (pixel)) • Poster: T.Hachiya (VTX (pixel)) • Poster: R. Akimoto (VTX (pixel)) Physics - Stefan Bathe for PHENIX, QM2011

  47. What I could not cover in this talk • Ti • Plenary: S. Esumi, Tue • Parallel: E. Kistenev (direct photons) Thu • Poster: Y. Yamaguchi (direct photons dAu) • v3, jet shape, h/s • Plenary: S. Esumi, Tue • Parallel: R. Lacey (v3, jet shape) Mon • Parallel: X. Gong (energy scan: bulk) Fri • Poster: S. Mizuno (PID v3) • Chiral Symmetry • Parallel: M. Makek (Results from HBD) Thu • Heavy Flavor • Plenary: C. Luizda Silva, Fri • Parallel: A. Sen (quarkonia) Tue • Parallel: M. Durham (open heavy flavor) Fri • Poster: S. Whitaker (Upsilon RAA) • Poster: A. Takahara (J/psi photoproduction) • Poster: H. Thewman (high pTsingle e in p+p) • Energy Loss • Plenary: M. Purschke (R_AA) Wen • Parallel: N. Grau (gamma-hadron, jets) Tue • Parallel: N. Novitsky (energy scan) Fri • Parallel: D. Sharma (light vector mesons) Mon • Poster: M. Tannenbaum (E loss RHIC vs. LHC) • Poster: O. Chvala (RAA in 39 and 62 GeV) • Parallel: D. Sharma (light vector mesons) Mon • Cold nuclear matter • Parallel: M. Chiu (small x dAucorrel) Thu • Parallel: J. Kamin (dAudileptons) Fri • Poster: Z. Citron (small x dAu correlations) • Poster: D. Perepelitsa (jets in dAu) • Future • Parallel: A. Sickles (Decadal Plan) Thu • Poster: M. Chiu (Fast TOF, 10 ps) • Poster:M. Kurosawa (VTX (pixel)) • Poster: T.Hachiya (VTX (pixel)) • Poster: R. Akimoto (VTX (pixel))

  48. Conclusions • v2 of thermal direct photons large • Further constrains Tiand t0 • CNM effects in d+Au • Non-linear density dependence of shadowing from J/y • Reconstructed jet Rcp modified • Low-x suppression from forward di-hadron correlations • v3 • Disentangle initial state from h/s • Double-hump disappears in 2-particle correlations • Energy loss • Cubic path-length dependence • Energy Scan • v2saturation 39 GeV • RAA suppressed alsoat 39 GeV Thank you! Stefan Bathe for PHENIX, QM2011

  49. Backup Stefan Bathe for PHENIX, QM2011

  50. Jet-p0 comparison d+Au • p0Rcpcalculated from published RdA • Consistent in overlapping pT range Stefan Bathe for PHENIX, QM2011

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