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Quarkonia and vector mesons in d+Au collision at forward rapidity in PHENIX

Quarkonia and vector mesons in d+Au collision at forward rapidity in PHENIX. Kwangbok Lee Korea University for PHENIX collaboration. Kwangbok Lee. Motivation Ⅰ - Quarkonia in A+A. - Each quarkonium has different binding radius. hep -ph/0609197v1 H. Satz.

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Quarkonia and vector mesons in d+Au collision at forward rapidity in PHENIX

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  1. Quarkonia and vector mesons in d+Au collision at forward rapidity in PHENIX Kwangbok Lee Korea University for PHENIX collaboration 21 April DIS 2010, Florence, Italy Kwangbok Lee

  2. MotivationⅠ- Quarkonia in A+A - Each quarkonium has different binding radius. hep-ph/0609197v1 H. Satz • Binding of a pair is subject to • color screening in QGP. • Melting temperatures depend on their • binding radius. • Temperature of QGP can be estimated • or another models like regeneration • can be tested. arXiv:0911.4806 21 April DIS 2010, Florence, Italy Kwangbok Lee

  3. low x high x MotivationⅡ- Quarkonia in d+A Q2 = 1.69 GeV2 nDS 1. Cold nuclear matter effect antishadowing HKN07 - Shadowing model <- Gluon densities in nucleus with different parton distribution functions(PDF) Color Glass Condensate(CGC)/Gluon saturation. EKS98 EPS09 EPS08 • Nuclear absorption • (Now we are comparing shadowingmodels • to J/y signal) • - Initial state parton energy loss • - Cronin effect • 2. Essential information to understand QGP. RGPb shadowing arXiv:0902.4154 Gluon density in different x 21 April DIS 2010, Florence, Italy Kwangbok Lee

  4. PHENIX Muon Arm Au d + - South North <y> ~ -1.7, x2 ~ 0.11 Gold going direction <y> ~ 1.7, x2 ~ 0.0035 deuteron going direction thought to be in shadowing region South North The average value of the momentum fraction x2 in the gold nucleus vs. rapidity for √sNN = 200 GeV North South 21 April DIS 2010, Florence, Italy Kwangbok Lee

  5. Nuclear modification factors Ncoll: number of binary collisions, 1 in p+p collision. If there is no nuclear matter effect, RdAu = Rcp= 1 If there is suppression, RdAu , Rcp< 1 21 April DIS 2010, Florence, Italy Kwangbok Lee

  6. J/yRdAu Run2003 dAu/Run2005 pp, PRC 79, 059901(E) (2009) arXiv:0903.4845(Erratum) Shadowing model comparison to RdAuvalues with EKS PDF and fixed breakup cross sections With NDSG and fixed breakup cross sections Published RdAu vs. rapidity result 21 April DIS 2010, Florence, Italy Kwangbok Lee

  7. J/yRcp NDSG EKS • Preliminary result with 2008 d+Au data • which has ~30 times statistics than • 2003 d+Au data. • Can’t fit the data with fixed breakup • cross sections. • Need to understand the suppression of • shadowing region. σ = 0 mb PHENIX PRELIMINARY σ = 0 mb σ = 4 mb σ = 4 mb PHENIX PRELIMINARY Rcp vs. rapidity 21 April DIS 2010, Florence, Italy Kwangbok Lee

  8. High mass distribution p+p d+Au Gold(Au) going, y<0 Deuteron(d) going, y>0 Physical background of Drell Yan, and is estimated (pythia) 21 April DIS 2010, Florence, Italy Kwangbok Lee

  9. Upsilon cross sections BR*dσ/dy = 28.2±9.4(stat.)±4.8(syst.)pb, y [-2.2, -1.2] BR*dσ/dy = 9.6±2.1(stat.)±1.5(syst.)nb, y [-2.2, -1.2] BR*dσ/dy = 31.1±8.7(stat.)±6.2(syst.)pb, y [1.2, 2.2] BR*dσ/dy = 6.7±1.7(stat.)±1.5(syst.)nb, y [1.2, 2.2] • pp cross section is reference to comparison to d+Au collision. • pp cross section vs. rapidity is following the shape of • Color Evaporation Model-CTEQ6M(PDF)(scaled down by ~2). • Cross section vs. rapidity of d+Au collision is asymmetric. 21 April DIS 2010, Florence, Italy Kwangbok Lee

  10. UpsilonRdAu RdAu = 0.84±0.34(stat.)±0.20(sys.), y [-2.2, -1.2] RdAu= 0.53±0.20(stat.)±0.16(sys.), y [1.2, 2.2] • First Upsilon RdAumeasurement at forward rapidity. • Showing suppression at small x region. • Waiting for theoretical comparison. 21 April DIS 2010, Florence, Italy Kwangbok Lee

  11. Light Vector Mesons Rcp Gold(Au) going, y<0 Deuteron(d) going, y>0 • First nuclear modification factor measurement for low mass vector mesons • in forward rapidity. • Significant suppression at deuteron going direction. • Stronger suppression for r/w than f and J/Y. 21 April DIS 2010, Florence, Italy Kwangbok Lee

  12. Prospect for cc ccis a very important particle to calculate the actual feed-down contributions to J/y, to decouple the cold nuclear matter effect. MuonArm 1.2<|y|<2.2 MPC 3.1<|y|<3.8 Foreground event Scaled mixed event Signal(Foreground – Mixed) Signal fitting with Gaussian and polynomial 2008 dAuNorth arm 21 April DIS 2010, Florence, Italy Kwangbok Lee

  13. Summary • Nuclear modification factors of Upsilon, J/y and light vector mesons are shown. • They show suppression at low x region but, not clearly understood yet. • Recent J/y Rcp result is not explained well with shadowing model and fixed breakup cross sections. • New Upsilon RdAu shows suppression in low x region and need to have theoretical comparison. • Low mass vector meson need to understand its production mechanisms. • feed down to J/y measurement is underway and important to decouple the cold nuclear matter effect and QGP state. • In future, PHENIX FVTX/VTX upgrade will reduce more background and make the y’ and even Drell-Yan measurement possible. 21 April DIS 2010, Florence, Italy Kwangbok Lee

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