In-medium effects on phase space distributions of antikaons measured in proton-nucleus collisions.
Differential production cross sections of K+/- mesons have been measured in p + C and p + Au collisions at 1.6, 2.5, and 3.5 GeV proton beam energy. At beam energies close to the production threshold, the K- multiplicity is strongly enhanced with respect to proton-proton collisions. According to microscopic transport calculations, this enhancement is caused by two effects: the strangeness exchange reaction NY --> K- NN and an attractive in-medium K- N potential at saturation density.
Scheinast
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Forschungszentrum Rossendorf, D-01314 Dresden, Germany.
Böttcher
I
I
Debowski
M
M
Dohrmann
F
F
Förster
A
A
Grosse
E
E
Koczoń
P
P
Kohlmeyer
B
B
Laue
F
F
Menzel
M
M
Naumann
L
L
Schwab
E
E
Senger
P
P
Shin
Y
Y
Ströbele
H
H
Sturm
C
C
Surówka
G
G
Uhlig
F
F
Wagner
A
A
Waluś
W
W
Kämpfer
B
B
Barz
H W
HW