Production of the S01 diproton in the pp→ppπ0 reaction at 0.8 GeV
/ Authors
S. Dymov, M. Büscher, D. Gusev, M. Hartmann, V. Hejny, A. Kacharava, A. Khoukaz, V. Komarov, P. Kulessa, A. Kulikov
and 14 more authors
V. Kurbatov., N. Lang, G. Macharashvili, T. Mersmann, S. Merzliakov, S. Mikirtytchiants, A. Mussgiller, D. Prasuhn, F. Rathmann, R. Schleichert, H. Stroeher, Y. Uzikov, C. Wilkin, S. Yaschenko
/ Abstract
Abstract The p p → p p π 0 differential cross section has been measured with the ANKE spectrometer at COSY–Julich for pion cms angles between 0° and 15.4° at a proton beam energy of 0.8 GeV. The selection of diproton pairs with an excitation energy E p p 3 MeV ensures that the final pp system is dominantly in the spin-singlet S 0 1 state. The kinematics are therefore very similar to those of p p → d π + but with different spin and isospin transitions. The cross sections are over two orders of magnitude smaller than those of p p → d π + and show a forward dip that is even stronger than that seen at lower energies. The results should provide a crucial extra test of pion production models in nucleon–nucleon collisions.
Journal: Physics Letters B