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Rapidity and k T dependence of HBT correlations in Au+Au collisions at 200 GeV

This study examines the rapidity and kT dependence of HBT correlations in Au+Au collisions at 200 GeV using data from the PHOBOS Spectrometer at Brookhaven National Laboratory. The results help to understand the source properties and dynamics in heavy-ion collisions at high energies.

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Rapidity and k T dependence of HBT correlations in Au+Au collisions at 200 GeV

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  1. Rapidity and kT dependence of HBT correlations in Au+Au collisions at 200 GeV Burt Holzman Brookhaven National Laboratory for the PHOBOS Collaboration: Birger Back,Mark Baker, Maarten Ballintijn, Donald Barton, Russell Betts, Abigail Bickley, Richard Bindel, Wit Busza (Spokesperson), Alan Carroll, Zhengwei Chai, Patrick Decowski, Edmundo García, Tomasz Gburek, Nigel George, Kristjan Gulbrandsen, Stephen Gushue, Clive Halliwell, Joshua Hamblen, Adam Harrington, Conor Henderson, David Hofman, Richard Hollis, Roman Hołyński, Burt Holzman, Aneta Iordanova, Erik Johnson, Jay Kane, Nazim Khan, Piotr Kulinich, Chia Ming Kuo, Willis Lin, Steven Manly, Alice Mignerey, Gerrit van Nieuwenhuizen, Rachid Nouicer, Andrzej Olszewski, Robert Pak, Inkyu Park, Heinz Pernegger, Corey Reed, Michael Ricci, 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, Siarhei Vaurynovich, Robin Verdier, Gábor Veres, Edward Wenger, Frank Wolfs, Barbara Wosiek, Krzysztof Woźniak, Alan Wuosmaa, Bolek Wysłouch, 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

  2. PHOBOS Schematic 200 GeV Au+Au dataset after HBT cuts: 1 million events7 million pairs Burt Holzman (BNL)

  3. PHOBOS Spectrometer • Reversible 2T field • Two symmetric arms • Fine pixel granularity gives small two- particle inefficiency region (25x50 mrad) • Dp/p < 1.5% • Pairs with small Dq also have small separation at detector: small detectors are good for HBT! Burt Holzman (BNL)

  4. HBT @ RHIC: Challenge for Theory • Huge (15 fm) source doesn’t exist at RHIC • Ro/Rs ~ 1 PHOBOS 200prelim. p-p-[NPA 715, 611 (2002)] STAR 130 [PRL 87, 082301 (2001)] PHENIX 130 [PRL 88, 192302 (2002)] Theory: Soff, Bass, Dumitru [PRL 86, 3981 (2001)] PHOBOS Preliminary Newer models include opacity but still don’t fit data, i.e. Hirano & Tsuda [NPA 715, 815 (2002)] • I will not be solving the HBT puzzle; but I will dump more pieces into the mix! Burt Holzman (BNL)

  5. Some HBT definitions Source velocity included in correlation function • kT: pair transverse momentum • Bertsch-Pratt (BP) parameterization • Yano-Koonin-Podgoretsky (YKP) parameterization Burt Holzman (BNL)

  6. MC studies • First principles HBT generator [Kadija & Seyboth, PLB 287, 63, (1992)] - we can do 15 fm! • That was our first naive attempt -- let’s try something else Burt Holzman (BNL)

  7. MC studies • HIJING (weight “actual” pairs), simulate detector with GEANT, real reconstruction • We can reproducecorrelation functions quite well Burt Holzman (BNL)

  8. PHOBOS Coulomb Correction PHOBOS Coulomb Correction: Used from Day 1 PHOBOS data corrected with PHOBOS CoulCorr Ceres02 CoulCorr Coulomb Correction Usual plot Gamowλ = 1 Rinv = 5 fm λ = 0.5 Rinv = 5 fmλ = 0.1 Rinv = 5 fm l Rout Rside Rlong Rol 0.57  .05 4.7  .3 fm4.3  .4 fm 5.1  .3 fm1.2  1.9 fm2 0.57  0.04 4.8  0.3 fm 4.4  0.4 fm 5.0  0.3 fm 1.6  1.8 fm2 2 Qinv (GeV/c) Burt Holzman (BNL)

  9. Coulomb Correction II Bowler(‘91)/Sinyukov(‘98)/CERES(‘02)/STAR(‘03)/PHENIX(‘03) PHOBOS(‘02) Burt Holzman (BNL)

  10. Particle Identification p K- Contamination from pK, pp, pK < 10% Contamination from KK, pp < 1% p- Burt Holzman (BNL)

  11. Bertsch-Pratt vs. kT Au+Au p-p- 0-15% central Burt Holzman (BNL)

  12. Bertsch-Pratt vs. kT: RHIC data Au+Au p-p- central PHOBOS Preliminary PHOBOS Preliminary PHOBOS 200 GeV prelim. STAR QM2002 [NPA 715, 623 (2002)] PHENIX PRL (sub.) [nucl-ex/0401003] PHOBOS Preliminary PHOBOS Preliminary Burt Holzman (BNL)

  13. Bertsch-Pratt vs. Y PHOBOS Preliminary PHOBOS Preliminary PHOBOS Preliminary Within errors, no BP Y-dependence in our acceptance Burt Holzman (BNL)

  14. Why YYKP ? YYKP Ypp Slowly expanding source in zweak p-z correlations Exploding source in zstrong p-z correlations z z Ypp slowly varies Ypp scales with YYKP YYKP Ypp Burt Holzman (BNL)

  15. Yano-Koonin-Podgoretsky vs. Y Fit in Lab frame Fit in LCMS frame • Pair rapidity scales with source rapidity PHOBOS Preliminary 0-15 % Central PHOBOS Preliminary0-15% Central All results presented in lab frame Burt Holzman (BNL)

  16. Comparison to NA49 NA49: .1 < kT < .2 GeV/c PHOBOS: .1 < kT < 1.4 GeV/c ? • SPS (sNN = 17.2 GeV) RHIC (sNN = 200 GeV) both exhibit similar scaling behavior Fit in LCMS frame PHOBOS Preliminary NA49 [EPJ c2, 661 (1998)] Burt Holzman (BNL)

  17. Conclusions & Outlook • More pieces added to the puzzle • PHOBOS nicely complements the current RHIC HBT dataset in kT and Y • Rout, Rside, Rlong: consistent with weak or no rapidity dependence from .4 < Y < 1.3 • Pair rapidity scales with source rapidity • High statistics from current RHIC run will decrease errors and increase kT reach • See C. Ming Kuo’s poster at 5 pm Burt Holzman (BNL)

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