Hadron Spectra from
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Transcript of Hadron Spectra from
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Hadron Spectra from
Gábor I. Veres / MITfor the
PHOBOS Collaboration
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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 LABORATORYINSTITUTE OF NUCLEAR PHYSICS, KRAKOW MASSACHUSETTS INSTITUTE OF TECHNOLOGYNATIONAL CENTRAL UNIVERSITY, TAIWAN UNIVERSITY OF ILLINOIS AT CHICAGO
UNIVERSITY OF MARYLAND UNIVERSITY OF ROCHESTER
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PHOBOS Detector System
New trigger systemfor d+Au PID spectra
TOF
TOF
SpecTrig
See poster by C. Henderson and G.V.
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pT (GeV/c)0.05 0.5 5.0
Stoppingparticles dE/dx TOF
Particle ID from low to high pT
Eloss (MeV)
dE
/dx
Subm. to PRLnucl-ex/0401006
0.4
0.6
0.8
25
1.2
1.4
20151050
0.2
0
1.0
PHOBOS PID Capabilities
1 2 3 4 50p (GeV/c)
30
40
50
60
70
1/v
(ps
/cm
)
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Acceptance for PID Analyses
dE/dx
TOF
K p
pT (
Ge
V/c
)
pT (
Ge
V/c
)
pT (
Ge
V/c
)
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d+Au: =Ncoll
/Npart
d
Particle Ratios Using dE/dx PID
Subm. to PRC nucl-ex/030913
See poster by A.A. Bickley
PHOBOS 200 GeV
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...p/p Compared to Models
200 GeV
PHOBOS Preliminary
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Au+Au: =Ncoll
/(Npart
/2)d+Au: =N
coll/N
partd
Particle Ratios Using dE/dx PID
Subm. to PRC nucl-ex/030913
See poster by A.A. Bickley
PHOBOS 200 GeV
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Particle/Antiparticle Ratios using the TOFd+Au
T
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Identified pT -spectra in d+Au
Not feed-down corrected
Scale uncertainty: 15%
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Particle Composition in d+Au
Not feed-down corrected
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Identified mT-spectra in d+Au
Scale uncertainty: 15%m
T=m +p
T
2 2 2
Not feed-down corrected
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Identified mT-spectra at 200 GeV
Subm. to PRLnucl-ex/0401006
d+Au
Scale uncertainty: 15%
Not feed-down corrected
Au+Au
Spectra normalized at 2 GeV/c
200 GeV
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Comparison: Low Energy d+Au
Cronin, PRD 11, 3105, 1975-0.1< <0.2y
y0.2< <1.2-0.5< <-0.2y
lab=3.26
Not feed-down corrected
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d+Au200 GeV
Centrality Dependence of p/h+, p/h-
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Centrality dependence
peripheral 40-70% central 0-20%
d+Au200 GeV
Centrality Dependence of p/h+, p/h-
medium 20-40%
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Cronin Effect in d+Au vs. Centrality
6% mostcentral Au+AuPRL 91, 072302 (2003)
peripheral
central
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PRL 91, 072302 (2003)
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Cronin Effect as a Function of (d+Au)
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Cronin Effect as a Function of (d+Au)
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Evolution of RdAu with
See poster by J.L. Kane
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More coming soon...
Summary
● Phobos has PID coverage from 0.05 to 3.5 GeV/c in pT
First PID ratios and spectra from PHOBOS TOF
Surprisingly small centrality dependence of p/p ratios
Approximate mT scaling in d+Au as opposed to Au+Au
Particle composition in d+Au: similar pT-dependence to
lower energy data (but different overall proton fraction) ● Study of -dependence
Exciting new -dependent RdAu values measured
RdAu continuously decreases with