Gábor I. Veres Quark Matter 2006, Shanghai, November 14-20, 2006 1 Anti-particle to particle ratios in p+p, Cu+Cu and Au+Au collisions at RHIC Gábor I. Veres Eötvös Loránd University, Budapest Massachusetts Institute of Technology, Cambridge Quark Matter 2006 Conference, Shanghai, November 19, 2006 the collaborat
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Anti-particle to particle ratios in p+p, Cu+Cu and Au+Au collisions at RHIC
for the collaboration. Anti-particle to particle ratios in p+p, Cu+Cu and Au+Au collisions at RHIC. G á bor I. Veres E ötvös Loránd University, Budapest Massachusetts Institute of Technology, Cambridge. Quark Matter 2006 Conference, Shanghai, November 19, 2006. - PowerPoint PPT Presentation
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Gábor I. Veres Quark Matter 2006, Shanghai, November 14-20, 2006
1
Anti-particle to particle ratios in p+p, Cu+Cu and Au+Au collisions at RHIC
Gábor I. VeresEötvös Loránd University, Budapest
Massachusetts Institute of Technology, Cambridge
Quark Matter 2006 Conference, Shanghai, November 19, 2006
for the collaboration
Gábor I. Veres Quark Matter 2006, Shanghai, November 14-20, 2006
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Collaboration
Burak Alver, Birger Back, Mark Baker, Maarten Ballintijn, Donald Barton, Russell Betts, Richard Bindel,
Wit Busza (Spokesperson), Vasundhara Chetluru, Edmundo García, Tomasz Gburek, Joshua Hamblen, Conor Henderson, David Hofman, Richard Hollis, Roman Hołyński, Burt Holzman, Aneta Iordanova, Chia Ming Kuo, Wei Li, Willis Lin, Constantin Loizides, Steven Manly, Alice Mignerey, Gerrit van Nieuwenhuizen, Rachid Nouicer, Andrzej Olszewski, Robert Pak, Corey Reed, Christof
Roland, Gunther Roland, Joe Sagerer, Peter Steinberg, George Stephans, Andrei Sukhanov, Marguerite Belt Tonjes, Adam Trzupek, Sergei Vaurynovich, Robin Verdier, Gábor Veres, Peter Walters, Edward Wenger, Frank Wolfs, Barbara Wosiek, Krzysztof Woźniak, Bolek Wysłouch
ARGONNE NATIONAL LABORATORY BROOKHAVEN NATIONAL LABORATORYINSTITUTE OF NUCLEAR PHYSICS PAN, KRAKOW MASSACHUSETTS INSTITUTE OF TECHNOLOGY
NATIONAL CENTRAL UNIVERSITY, TAIWAN UNIVERSITY OF ILLINOIS AT CHICAGOUNIVERSITY OF MARYLAND UNIVERSITY OF ROCHESTER
9 ongoing PhD thesis studies
Gábor I. Veres Quark Matter 2006, Shanghai, November 14-20, 2006
Gábor I. Veres Quark Matter 2006, Shanghai, November 14-20, 2006
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New results at 62.4 GeV fit smoothly into the energy evolution of antiparticle/particle ratios
Results: energy dependence
arXiv:nucl-ex/0610001submitted to PRCstat.errors only
Gábor I. Veres Quark Matter 2006, Shanghai, November 14-20, 2006
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Cu+Cu ratios, all 3 species vs. Npart
• Integrated over pT and y
• p/p ratios: little, if any, centrality dependence (still not understood theoretically)
_
• Similarly to Au+Au, strong collision energy dependence
200 GeV
62.4 GeV
y0
Gábor I. Veres Quark Matter 2006, Shanghai, November 14-20, 2006
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Comparison of systems at 200 GeV
• p/p ratios do not depend strongly on
- system size- centrality
_
• The study is being currently extended to 62.4 GeV
y0
p+p: Phys.Rev. C71, 021901 (2005)
Gábor I. Veres Quark Matter 2006, Shanghai, November 14-20, 2006
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Ratios of different species
Ratios of different species (like p/) are of significant interest:they are used to study the baryon excess observed at higher RHIC energies in the 2 – 4 GeV/c pT range.
For that, identified spectra of all species were analyzed.
Gábor I. Veres Quark Matter 2006, Shanghai, November 14-20, 2006
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Proton spectra are harder thanthe meson spectra
Time-of-Flight measurementextends the pT reach to 3 GeV/cfor protons
y0
Smooth evolution with centrality
arXiv:nucl-ex/0610001submitted to PRC
Identified particle pT -spectra,
Au+Au at 62.4 GeV
Gábor I. Veres Quark Matter 2006, Shanghai, November 14-20, 2006
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Particle production at very low pT
Low pT spectra carry information about radial flow, possible anomalousenhancement at very low pT, quantum mechanical effects, scaling laws
• Unique low-pT coverage of PHOBOS
T = 1016 MeVsurface = 0.720.02
y0
PHOBOS Au+Au 62.4 GeVarXiv:nucl-ex/0610001submitted to PRC
T = 1026 MeVsurface = 0.760.02
T = 1036 MeVsurface = 0.780.02
Gábor I. Veres Quark Matter 2006, Shanghai, November 14-20, 2006