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Centrality Dependence of Charged Hadron Production at RHIC d+Au vs Au+Au

Centrality Dependence of Charged Hadron Production at RHIC d+Au vs Au+Au. Gunther Roland/MIT for the PHOBOS Collaboration. BNL June 18, 2003. Collaboration. Birger Back, Mark Baker, Maarten Ballintijn, Donald Barton, Bruce Becker, Russell Betts,

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Centrality Dependence of Charged Hadron Production at RHIC d+Au vs Au+Au

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  1. Centrality Dependence of Charged Hadron Production at RHICd+Au vs Au+Au Gunther Roland/MIT for the PHOBOS Collaboration BNL June 18, 2003

  2. Collaboration Birger Back,Mark Baker, Maarten Ballintijn, Donald Barton, Bruce Becker, Russell Betts, Abigail Bickley, Richard Bindel, Andrzej Budzanowski, Wit Busza (Spokesperson), Alan Carroll, Patrick Decowski, Edmundo Garcia, Tomasz Gburek, Nigel George, Kristjan Gulbrandsen, Stephen Gushue, Clive Halliwell, Joshua Hamblen,Adam Harrington,Conor Henderson, David Hofman, Richard Hollis, Roman Holynski, Burt Holzman, Aneta Iordanova,Erik Johnson, Jay Kane, Nazim Khan, Piotr Kulinich, Chia Ming Kuo,Jang Woo Lee, Willis Lin, Steven Manly, Alice Mignerey, Gerrit van Nieuwenhuizen, Aaron Noell, Rachid Nouicer, Andrzej Olszewski, Robert Pak, Inkyu Park, Heinz Pernegger, Corey Reed, Louis Remsberg, Christof Roland, Gunther Roland, Joe Sagerer, Pradeep Sarin, Pawel Sawicki, Iouri Sedykh, Wojtek Skulski, Chadd Smith, Peter Steinberg, George Stephans, Andrei Sukhanov, Ray Teng, Marguerite Belt Tonjes, Adam Trzupek, Carla Vale, Robin Verdier, Gábor Veres, Bernard Wadsworth, Frank Wolfs, Barbara Wosiek, Krzysztof Wozniak, Alan Wuosmaa, Bolek Wyslouch, Jinlong Zhang ARGONNE NATIONAL LABORATORY BROOKHAVEN NATIONAL LABORATORY INSTITUTE OF NUCLEAR PHYSICS, KRAKOW MASSACHUSETTS INSTITUTE OF TECHNOLOGY NATIONAL CENTRAL UNIVERSITY, TAIWAN UNIVERSITY OF ILLINOIS AT CHICAGO UNIVERSITY OF MARYLAND UNIVERSITY OF ROCHESTER

  3. PHOBOS preliminary Au+Au 200 GeV 15% central ? How to connect observed final state particles to theory of strong interaction?

  4. Particle Multiplicity at RHIC 600 1200 Compilation by K. Eskola Rapidity Density

  5. Multiplicity at low end of range But: Energy density 30x nuclear matter Most models didn’t do so well PHOBOS Central Au+Au (200 GeV) 600 1200 Compilation by K. Eskola Rapidity Density Particle Multiplicity at RHIC PHOBOS multiplicity papers: Phys. Rev. Lett. 85 , 3100 (2000) Phys. Rev. Lett. 87, 102303 (2001) Phys. Rev. C 65 , 31901R (2002) Phys.Rev. Lett. 88 , 22302 (2002) Phys. Rev. C 65 , 061901R (2002) nucl-ex/0210015, PRL in Press nucl-ex/0301017, subm. to PRL

  6. Parton Saturation PHOBOS Central Au+Au (200 GeV) 600 1200 Compilation by K. Eskola Rapidity Density Particle Multiplicity at RHIC Low Energy High Energy Color Glass

  7. PHOBOS Central Au+Au (200 GeV) 600 1200 Compilation by K. Eskola Rapidity Density Particle Multiplicity at RHIC Hadron multiplicities at RHIC well described by Parton Saturation Kharzeev & Levin, Phys. Lett. B523 (2001) 79 Color Glass Data: PHOBOS, Phys. Rev. Lett. 87, 102303 (2001)

  8. Relative to UA1 p+p 0.2<yp<1.4 Data: PHOBOS, nucl-ex/0302015 Submitted to Phys Lett B pT Spectra for Au+Au @ 200 GeV

  9. Initial State Coherence? Interaction in Dense Medium? Centrality Dependence vs pT PHOBOS, nucl-ex/0302015 Similar centrality dependence at pT = 0.5 and 4 GeV/c !

  10. Predictions for d+Au pQCD Parton Saturation Vitev, nucl-th/0302002, Phys.Lett.B in press Vitev and M.Gyulassy, Phys.Rev.Lett. 89 (2002) Kharzeev, Levin, McLerran, hep-ph/021332 “~30%suppression of high pT particles” (central vs peripheral) Nuclear Modification Factor RdAu Central Peripheral 16% increase central vs peripheral

  11. PHOBOS Detector 2003 T0 T0 mini-pCal SPECTRIG • Moved TOF walls back • 5 m from interaction point • New on-line high pT Spectrometer Trigger • New “time-zero” (T0) Cerenkov detectors • On-line vertexing and ToF start time • Forward proton calorimeters on Gold and Deuteron sides • DAQ upgrade (x10) pCal

  12. Centrality Determination in d+Au HIJING Simulation dN/dh Counts Multiplicity distribution Pseudorapidity • Glauber Calculation • Hijing 1.383 • Hulthen w.f. • 41mb inelastic cross-section • Full GEANT Simulation

  13. Compare to p+p reference… 41mb (same as for Glauber) From Glauber (HIJING 1.383) From UA1, using Pythia to go from |h| < 2.5 to 0.2 < h < 1.4 …for each centrality bin d+Au pT Spectra PHOBOS d+Au: nucl-ex/0306025

  14. RdAu vs pT PHOBOS d+Au: nucl-ex/0306025 central Au+Au All syst. uncertainties: 90% C.L.

  15. Centrality dependence of RdAu PHOBOS d+Au: nucl-ex/0306025 Data disfavor initial state interpretation of Au+Au high-pT suppression N.B. Smaller sppinel would increase RdAu central vs RdAu peripheral All syst. uncertainties: 90% C.L.

  16. Connection to QCD Initial State ‘Final State’ Interactions Interaction of fast partons with dense medium has been observed Quantitative diagnostic tool now established Multiplicity systematics connected to initial state Consistent with parton saturation picture

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