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Summary of High p T Physics with PHOBOS

Summary of High p T Physics with PHOBOS. Gunther Roland/MIT for the PHOBOS collaboration. PHOBOS Collaboration. Burak Alver , Birger Back, Mark Baker, Maarten Ballintijn, Donald Barton, Russell Betts, Abigail Bickley ,

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Summary of High p T Physics with PHOBOS

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  1. Summary of High pT Physics with PHOBOS Gunther Roland/MIT for the PHOBOS collaboration

  2. PHOBOS Collaboration Burak Alver, Birger Back,Mark Baker, Maarten Ballintijn, Donald Barton, Russell Betts, Abigail Bickley, Richard Bindel, Wit Busza (Spokesperson), Alan Carroll, Zhengwei Chai, Vasundhara Chetluru, Patrick Decowski, Edmundo García, Tomasz Gburek, Nigel George, Kristjan Gulbrandsen, Clive Halliwell, Joshua Hamblen, Ian Harnarine, Conor Henderson, David Hofman, Richard Hollis, Roman Holynski, Burt Holzman, Aneta Iordanova, Jay Kane, Nazim Khan, Piotr Kulinich, Chia Ming Kuo, Wei Li, Willis Lin, Steven Manly, Alice Mignerey, Gerrit van Nieuwenhuizen, Rachid Nouicer, Andrzej Olszewski, Robert Pak, Heinz Pernegger, Corey Reed, Christof Roland, Gunther Roland, Joe Sagerer, Iouri Sedykh, Wojtek Skulski, Chadd Smith, Peter Steinberg, George Stephans, Andrei Sukhanov, Marguerite Belt Tonjes, Adam Trzupek, Carla Vale, Sergei Vaurynovich, Robin Verdier, Gábor Veres, Peter Walters, Edward Wenger, Frank Wolfs, Barbara Wosiek, Krzysztof Wozniak, Alan Wuosmaa, Bolek Wyslouch ARGONNE NATIONAL LABORATORY BROOKHAVEN NATIONAL LABORATORY INSTITUTE OF NUCLEAR PHYSICS PAN, KRAKOW MASSACHUSETTS INSTITUTE OF TECHNOLOGY NATIONAL CENTRAL UNIVERSITY, TAIWAN UNIVERSITY OF ILLINOIS AT CHICAGO UNIVERSITY OF MARYLAND UNIVERSITY OF ROCHESTER

  3. PHOBOS Detector T0 counter 137000 Silicon Pad Channels SpecTrig TOF Paddle Trigger Counter Octagon NIM A 499, 603-623 (2003) Spectrometer

  4. PHOBOS PID Capabilities 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 25 20 10 15 0 5 PRC in press nucl-ex/0401006 dE/dx [MIP] dE/dx 1/v (ps/cm) Eloss(MeV) Stopping particles TOF dE/dx 5.0 0.5 0.05 pT (GeV/c)

  5. PHOBOS Data Sets PLB 578297, 2004 PLB 578297, 2004 nucl-ex/0405003 200 GeV d+Au 62.4 GeV Au+Au 200 GeV Au+Au Run 4 Run 2 Run 3

  6. Results for d+Au 200 GeV d+Au

  7. RdAu vs. Centrality PRL 91, 072302 (2003) peripheral central h ~ 1 6% most central Au+Au

  8. RdAu as a Function of h nucl-ex/0406017, PRC in press nucl-ex/0406017, PRC in press

  9. Identified pT -spectra in d+Au Scale uncertainty: 15% Not feed-down corrected

  10. Particle Composition in d+Au Not feed-down corrected

  11. mT-spectra in d+Au 2 2 2 mT=m +pT Scale uncertainty: 15% Not feed-down corrected

  12. mT Scaling in d+Au vs Au+Au PRC in press nucl-ex/0401006 Au+Au Spectra normalized at 2 GeV/c d+Au Scale uncertainty: 15% Not feed-down corrected

  13. Results for Au+Au 62.4 GeV Au+Au 200 GeV Au+Au

  14. Energy Dependence of RAA 62.4 GeV 200 GeV nucl-ex/0405003 PLB 578297, 2004 At 62.4 GeV, significantly higher RAA than at 200 GeV

  15. Energy Dependence of RAA nucl-ex/0405003

  16. RAA at 62.4 GeV from Theory Vitev: nucl-th/0404052 XN Wang: nucl-th/0405029 Gallmeister, Cassing: hep-ph/0408223 Adil, Gyulassy: nucl-th/0405036 Eskola, Honkanen, Salgado, Wiedemann: hep-ph/0406319

  17. RAA at 62.4 GeV vs Theory nucl-ex/0405003

  18. Centrality Dependence of RAA 62.4 GeV 200 GeV nucl-ex/0405003 PLB 578297, 2004 Features of centrality dependence?

  19. Participant Scaling d+Au Au+Au PHOBOS nucl-ex/0309021 PHOBOS nucl-ex/0301017 200 GeV <Nch>e+e-*<0.5Npart> 130 GeV <Nch>pp *<0.5Npart> 19.6 GeV

  20. Centrality Evolution in Au+Au • Use central A+A as denominator • Scale with 1/<Npart>

  21. RAA at 200 and 62.4 GeV (Au+Au) Npart 62.4 GeV 200 GeV nucl-ex/0405003 Yields normalized by Npart less centrality-dependent

  22. Factorization of Energy/Centrality Dependence nucl-ex/0405003 62.4 GeV 200 GeV • Yield/participant changes by less than 25% for all pT • Factorization of energy and centrality dependence

  23. Factorization of Energy/Centrality Dependence PHOBOS nucl-ex/0405027, PRC in press

  24. Factorization of Energy/Centrality Dependence PHOBOS nucl-ex/0405027, PRC in press PHOBOS nucl-ex/0405027, PRC in press 1-s errors • dN/dh / <Npart/2> changes with sqrt(s), <Npart> • Energy and Centrality Dependence Factorize

  25. Factorization of Energy/Centrality Dependence PHOBOS nucl-ex/0405027, PRC in press Armesto, Salgado, Wiedemann hep-ph/0407018 1-s errors

  26. Factorization of Longitudinal Dynamics PRL 91, 052303 (2003).   PHOBOS PHOBOS

  27. Factorization of Longitudinal Dynamics PRL 91, 052303 (2003).   PHOBOS Npart RPC PHOBOS PRL 91, 052303 (2003).   Again: Factorization of energy/centrality dependence

  28. Summary • Study of energy and system-size dependence • Opaque medium created in A+A • Magnitude and energy dependence of suppression calculable • Soft scaling at intermediate pT? • mT-Scaling in d+Au • Factorization of energy and centrality dependence • More information from • PID spectra • high statistics 200 GeV Au+Au data • Cu+Cu run

  29. RPC vs. pT, PHOBOS and STAR, 200 GeV Npart PLB 578297, 2004 PRL 91, 172302, 2003

  30. Collision Scaling vs Centrality

  31. Factorization of Energy/Centrality Dependence 62.4 GeV 200 GeV

  32. Npart scaling relative to p+p • Keep p+p as denominator • Scale with <Npart> instead of <Ncoll>

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