On the Absorption of antibaryons in nuclei
Niels Bohr Institute for Astronomy, Physics and Geophysics, University of Copenhagen,
2100 Copenhagen, Denmark
Received: 15 July 1999 / Revised version: 10 November 1999 Communicated by P. Kienle
Abstract
Antiproton (
)
and antilambda (
)
production has
been measured for minimum bias in p+A collisions and central
A1+A2 collisions at the CERN-SPS by the collaborations NA35/49
and NA44. The measurements are extrapolated from rapidity distributions
to absolute minimum bias cross sections. It is shown that the cross sections divided by A
A2 follow an exponential
trend as a function of a characteristic length obtained from a Glauber
type absorption model, while the
cross sections divided
by AA2 are constant. The exponential trend also holds
for
production at the lower energies of the Brookhaven AGS. A
discussion of the physics interpretation of the established trends in
terms of an effective absorption cross section is presented.
PACS
25.75.-q Relativistic heavy-ion collisions -
25.75.Dw Particle and resonance production
Copyright Società Italiana di Fisica, Springer-Verlag 2000
