INTRINSIC AND EXTRINSIC P T EFFECTS ON J/  SHADOWING This work, on behalf of E. G. Ferreiro F. Fleuret J.-P. Lansberg A. Rakotozafindrabe Work in progress…

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Presentation transcript:

INTRINSIC AND EXTRINSIC P T EFFECTS ON J/  SHADOWING This work, on behalf of E. G. Ferreiro F. Fleuret J.-P. Lansberg A. Rakotozafindrabe Work in progress… 21/11/2015 F. Fleuret LLR-CNRS/IN2P3 FFLR - Hard Probes Transverse momentum dependence of J/  shadowing effects in  s NN =200 GeV d+Au collisions at RHIC (and its consequences in Au+Au)

Introduction 2 Shadowing and d+Au PHENIX data 21/11/2015 F. Fleuret LLR-CNRS/IN2P3 FFLR - Hard Probes GeV/c PHENIX d+Au data Phys. Rev. C 77, (2008)Shadowing modelisation from R.Vogt, Phys.Rev. C71 (2005) Assuming p T =0 2 remarks: Need at least 2 different  breakup to fit R dAu.vs.N coll No prediction for R dAu.vs.p T N coll Nuclear modification factor Goal of this work: introduce J/  p T in shadowing computation  In this talk, we’ll consider EKS98 shadowing only  Investigating two mechanisms  g+g  J/   « intrinsic » scheme: the p T of the J/  comes from initial partons Can be parametrized using the data  g+g  J/  +g  « extrinsic » scheme: the p T of the J/  is balanced by the outgoing gluon Need a model to be described R dAu -2.2<y< <y< <y<2.2

This work Glauber modelisation of CNM effects 3 An event generator to produce J/  samples  Based on a glauber Monte Carlo  Use J/  production models (or data) to get (J/  y, p T, x 1, x 2, Q²  Using EKS98, modify the J/  cross section according to:  Compare with data using:  Use « intrinsic » (g+g  J/  ) and « extrinsic » (g+g  J/  +g) schemes as inputs to get J/  kinematics information 21/11/2015 F. Fleuret LLR-CNRS/IN2P3 FFLR - Hard Probes 2008 See arXiv: for more details

« intrinsic » J/  production g+g  J/  4 y, p T, x 1, x 2, Q² can be determined with data : using PHENIX p+p data Phys. Rev. Lett. 98, (2007) kinematics: y, p T randomly picked on the data Then, compute kinematics as input of shadowing factors 21/11/2015 F. Fleuret LLR-CNRS/IN2P3 FFLR - Hard Probes 2008

« extrinsinc » J/  production g+g  J/  +g 5 21/11/2015 F. Fleuret LLR-CNRS/IN2P3 FFLR - Hard Probes 2008 Color singlet and color octet Color singlet and color octet calculations compared with PHENIX run 3 (200 GeV/c) p+p data : PHENIX, Phys. Rev. Lett 92, (2004). S-channel cut mechanism S-channel cut mechanism (extension of the color singlet model) compared with PHENIX run 5 (200 GeV/c) p+p data: Haberzettl and Lansberg, Phys. Rev. Lett. 100, (2008). Good description for p T > 2 GeV/c No description below 2 GeV/c Model provides y, p T, x 1 ; get and Q²=M²+p T ²  Use s-channel cut model in the following

d+Au Rapidity dependence intrinsic.vs.extrinsic 6 Intrinsic (g+g  J/  ) Small difference when adding p T. In p+p: < 2 GeV/c No significant difference between p T from central and forward rapidity Extrinsic (g+g  J/  + g) Extrinsic (g+g  J/  + g) significant difference between intrinsic and extrinsic scheme : more antishadowing at mid rapidity ; less shadowing at forward rapidity. 21/11/2015 F. Fleuret LLR-CNRS/IN2P3 FFLR - Hard Probes 2008 No breakup cross section used for this plot

d+Au Rapidity dependence breakup (absorption) cross section 7 Nuclear absorption added Intrinsic scheme: following PHENIX PRC 77, (2008), best match is obtained with  breakup =  abs = 2.8 mb Extrinsic scheme:  breakup = 2.8 mb is not enough for extrinsic scheme to match data Try  breakup = 4.2 mb as measured by NA50.  good match to be done: determining best  breakup using  ² minimization 21/11/2015 F. Fleuret LLR-CNRS/IN2P3 FFLR - Hard Probes 2008

d+Au Centrality dependence intrinsic.vs. extrinsic (w/ absorption) 8 R dAu.vs. N coll Backward rapidity :  Intrinsic +  breakup =2.8 mb fails to reproduce the data (better with  breakup =5.2mb) Extrinsic +  breakup = 4.2 mb reproduces the data Mid rapidity:  Both scenarios have the same behavior. Good match Forward rapidity:  Both scenarios have the same behavior. Good match 21/11/2015 F. Fleuret LLR-CNRS/IN2P3 FFLR - Hard Probes 2008 PHENIX Phys. Rev. C 77, (2008) N coll « extrinsic » shows a fair agreement with the data using the same  breakup = 4.2 mb for all rapidities

d+Au Transverse momentum dependence intrinsic.vs. extrinsic (w/ absorption) 9 R dAu.vs. p T 1. Backward rapidity: 1. Backward rapidity: Same behavior for both scenarios ; difficult to conclude about the slope  ____________________________ 2. Mid rapidity: 2. Mid rapidity: Same behavior for both scenarios and match the data  ____________________________ 3. Forward rapidity: 3. Forward rapidity: Both scenarios have the same behavior ; slopes seem smaller than in the data   p T broadening ?  Cronin effect ? 21/11/2015 F. Fleuret LLR-CNRS/IN2P3 FFLR - Hard Probes 2008 Difficult to conclude Need more precise data

Au+Au centrality dependence intrinsic.vs. extrinsic (w/ absorption) 10 Intrinsic Same CNM suppression at forward and central rapidity. More « additionnal » suppression observed at forward than at mid rapidity Extrinsic More CNM suppression at forward than at central rapidity. Seems to be consistent with the behavior observed in most central data. R AA /CNM to be done… 21/11/2015 F. Fleuret LLR-CNRS/IN2P3 FFLR - Hard Probes 2008 N part

Au+Au rapidity dependence intrinsic.vs. extrinsic (w/ absorption) 11 Intrinsic Shape of CNM effects ~flat for all centrality bins  suppression due to HDM effects is larger at forward rapidity than at central rapidity. Extrinsic Shape of CNM effects is changing with centrality and follows the data  suppression due to HDM effects is ~flat for all centrality bins. 21/11/2015 F. Fleuret LLR-CNRS/IN2P3 FFLR - Hard Probes 2008

Au+Au transverse momentum dependence 12 21/11/2015 F. Fleuret LLR-CNRS/IN2P3 FFLR - Hard Probes 2008 Intrinsic Extrinsic No major difference between intrinsic and extrinsic  Both models seem to reproduce fairly well the slopes of |y|<0.35 data at any centrality  Both models fail to reproduce the slopes of |y|  [1.2,2.2] data for central events  larger slope in the data (Cronin effect ?)  Will look at …

Conclusion 13 We have investigated effects of « intrinsic » (g+g  J/  ) and « extrinsic » (g+g  J/  +g) p T schemes on shadowing (using EKS98) Observe significant differences in the shadowing effects when using the two schemes  it is important to understand J/  production in p+p collisions These differences affect the conclusion we can make when studying HDM effects in Au+Au collisions  The difference between R AuAu forward / R AuAu central can be partly due to CNM effects  The R AuAu.vs.y shape can be partly due to CNM effects Transverse momentum studies give additionnal information  R AuAu.vs.pT shape is fairly well reproduced by CNM effects at mid-rapidity  R AuAu.vs.pT slope is smaller for CNM effects than for the data at forward rapidity More precise d+Au data are needed to better constraint the models  new d+Au data have been recorded this year (run 8)  30 times more data… 21/11/2015 F. Fleuret LLR-CNRS/IN2P3 FFLR - Hard Probes 2008

intrinsic extrinsic 14 Backup slide x 1,2.vs.y 21/11/2015 F. Fleuret LLR-CNRS/IN2P3 FFLR - Hard Probes 2008 x1x1 x2x2 x2x2 x1x1 yy

Backup slide EKS /11/2015 F. Fleuret LLR-CNRS/IN2P3 FFLR - Hard Probes 2008 PHENIX μ, North PHENIX , SOUTH PHENIX e X1X1 X2X2 J/  North y > 0 X1X1 X2X2 J/  South y < 0 X1X1 X2X2 J/  Central y = 0 Large x 2 (in Au) ~0.090 Small x 2 (in Au) ~0.003 Intermediate x 2 ~ 0.02 d Au rapidity y x2x2 South Central North Eskola, Kolhinen, Vogt Nucl. Phys. A696 (2001)