DOI 10.1007/s100529800804
Neutral meson production in p-Be and p-Au collisions
at 450GeV
beam energy
G. Agakichiev1 - M. Appenheimer2 - R. Averbeck3 - F. Ballester4 - R. Baur5 - A. Brenschede2 - J. Diaz4 - A. Drees5 - U. Faschingbauer1 - J.L. Ferrero4 - P. Fischer5 - Z. Fraenkel6 - M. Franke2 - Ch. Fuchs1 - E. Gatti7 - P. Glässel5 - Th. Günzel5 - C. P. de los Heros6 - F. Hess1 - R. Holzmann3 - D. Irmscher5 - C. Jacob1 - W. Kühn2 - B. Lenkeit5 - H. Löhner8 - A. Marin4 - F.M. Marques4 - G. Martinez4 - V. Metag2 - M. Notheisen2 - R. Novotny2 - L. H. Olsen5 - R. Ostendorf9 - Y. Panebrattsev1 - A. Pfeiffer5 - I. Ravinovich6 - P. Rehak10 - M. Sampietro7 - A. Schön5 - J. Schukraft11 - Y. Schutz9 - S. Shimansky11 - A. Shor6 - R.S. Simon3 - H. J. Specht5 - V. Steiner6 - S. Tapprogge5 - G. Tel-Zur6 - I. Tserruya6 - Th. Ullrich5 - H. Wilschut8 - J. P. Wurm1 - V. Yurevich7
1 Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany
2 II. Physikalisches Institut der Universität Gießen, D-35392
Gießen, Germany
3 GSI, D-64220 Darmstadt, Germany
4 Instituto Fisica Corpuscular, E-46100 Burjassot Valencia, Spain
5 Physikalisches Institut der Universität Heidelberg, D-69120
Heidelberg, Germany
6 Weizmann Institute, Rehovot 76100, Israel
7 Politecnico di Milano, I-20133 Milano, Italy
8 Kernphysisch Versneller Institut, NL-9747AA Groningen, Netherlands
9 GANIL, F-14021 Caen, France
10 Brookhaven National Laboratory, Upton, NY 11973, USA
11 CERN, CH-1211 Geneva 23, Switzerland
Received: 2 July 1997 / Published online: 5 June 1998
Abstract
In a joint experiment the TAPS and CERES collaborations have studied
the production of the neutral mesons and
in
450GeV p-Be and p-Au collisions at the CERN SPS. The mesons were
identified by their
,
, and
decay modes. The cross sections were measured down to very low pT
(>= 20MeV/c) near mid-rapidity (3.0<y<4.0).
The
and
cross sections are smaller than expected from
extrapolations of earlier
data to low pT. Integrated over all pT, the ratios
/
and
/
are lower by about 25%
compared to previously published values. The reduction may be
attributed to the large number of low pT pions from decays of heavier
mesons. In addition, we have studied the dependence of neutral meson
production on the mass of the nuclear target and find it in good agreement
with previous measurements of charged mesons.
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