Neutral meson production in p-Be and p-Au collisions at 450 GeV beam energy |
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| Affiliation: | (1) Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany , DE;(2) II. Physikalisches Institut der Universit?t Gie?en, D-35392 Gie?en, Germany , DE;(3) GSI, D-64220 Darmstadt, Germany , DE;(4) Instituto Fisica Corpuscular, E-46100 Burjassot Valencia, Spain , ES;(5) Physikalisches Institut der Universit?t Heidelberg, D-69120 Heidelberg, Germany , DE;(6) Weizmann Institute, Rehovot 76100, Israel , IL;(7) Politecnico di Milano, I-20133 Milano, Italy , IT;(8) Kernphysisch Versneller Institut, NL-9747AA Groningen, Netherlands , NL;(9) GANIL, F-14021 Caen, France , FR;(10) Brookhaven National Laboratory, Upton, NY 11973, USA , US;(11) CERN, CH-1211 Geneva 23, Switzerland , CH |
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| Abstract: | In a joint experiment the TAPS and CERES collaborations have studied the production of the neutral mesons and in 450 GeV 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 ( 20 MeV/c) near mid-rapidity (). The and cross sections are smaller than expected from extrapolations of earlier data to low . Integrated over all , the ratios and / are lower by about 25% compared to previously published values. The reduction may be attributed to the large number of low 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. Received: 2 July 1997 / Published online: 5 June 1998 |
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