Ratios of charged antiparticles-to-particles near mid-rapidity in Au + Au collisions at sqrt[s(NN)]=130 GeV.
We have measured the ratios of antiparticles to particles for charged pions, kaons, and protons near mid-rapidity in central Au+Au collisions at sqrt[s(NN)] = 130 GeV. We observe <pi(-)>/<pi(+)> = 1.00+/-0.01(stat)+/-0.02(syst), <K->/<K+> = 0.91+/-0.07(stat)+/-0.06(syst), and <p>/<p> = 0.60+/-0.04(stat)+/-0.06(syst). The <K->/<K+> and <p>/<p> ratios give a consistent estimate of the baryo-chemical potential mu(B) of 45 MeV, a factor of 5-6 smaller than in central Pb+Pb collisions at sqrt[s(NN)] = 17.2 GeV.
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Physics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843, USA.
Baker
M D
MD
Barton
D S
DS
Betts
R R
RR
Bindel
R
R
Budzanowski
A
A
Busza
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W
Carroll
A
A
Decowski
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MP
Garcia
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E
George
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N
Gulbrandsen
K
K
Gushue
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Halliwell
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Heintzelman
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GA
Henderson
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Hołyński
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Hofman
D
D
Holzman
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B
Johnson
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E
Kane
J
J
Katzy
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J
Khan
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N
Kucewicz
W
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Kulinich
P
P
Lin
W T
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Manly
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McLeod
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D
Michałowski
J
J
Mignerey
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A
Mülmenstädt
J
J
Nouicer
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Olszewski
A
A
Pak
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Park
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IC
Pernegger
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Reed
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Remsberg
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LP
Reuter
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M
Roland
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C
Roland
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G
Rosenberg
L
L
Sarin
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P
Sawicki
P
P
Skulski
W
W
Steadman
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SG
Stephans
G S
GS
Steinberg
P
P
Stodulski
M
M
Sukhanov
A
A
Tang
J L
JL
Teng
R
R
Trzupek
A
A
Vale
C
C
van Nieuwenhuizen
G J
GJ
Verdier
R
R
Wadsworth
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B
Wolfs
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Wosiek
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B
Woźniak
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K
Wuosmaa
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Wysłouch
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B