https://doi.org/10.1140/epja/i2002-10229-y
Exclusive 
production in pp reactions
1
II. Physikalisches Institut, University of Gießen, Gießen, Germany
2
Dipartimento di Fisica “A. Avogadro” and INFN, Torino, Italy
3
Laboratoire National Saturne, CEA Saclay, France
4
Indiana University Cyclotron Facility, Bloomington, Indiana, USA
5
M. Smoluchowski Institute of Physics, Jagellonian University, Kraków, Poland
6
Forschungszentrum Rossendorf, Germany
7
JINR, Dubna, Russia
8
Universitá del Piemonte Orientale and INFN, Torino, Italy
9
H. Niewodniczanski Institute of Nuclear Physics, Kraków, Poland
* e-mail: Ingo.Froelich@exp2.physik.uni-giessen.de
Angular distributions for the exclusive reaction 
observed via the 
decay channel have been measured at 
GeV, 2.50 GeV and 2.85 GeV (excess energies Q = 324 MeV, 412 MeV and 554 MeV). The polar angle of the shows an anisotropy with respect to the beam direction for the lowest energy, which vanishes for the higher energies. The anisotropy of the pp polar angle increases slightly with the beam energy.
© Società Italiana di Fisica and Springer-Verlag, 2003
