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Exclusive eta production in pp reactions

Authors:	I. Fröhlich F. Balestra Y. Bedfer R. Bertini L. C. Bland A. Brenschede F. Brochard M. P. Bussa Seonho Choi M. L. Colantoni R. Dressler M. Dzemidzic J.-Cl Faivre A. Ferrero L. Ferrero J. Foryciarz V. Frolov R. Garfagnini A. Grasso S. Heinz W. W. Jacobs W. Kühn A. Maggiora M. Maggiora A. Manara D. Panzieri H.-W. Pfaff G. Piragino A. Popov J. Ritman P. Salabura V. Tchalyshev F. Tosello S. E. Vigdor G. Zosi

Affiliation:	(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

Abstract:	Angular distributions for the exclusive reaction observed via the $pi^{ + }pi^{-}pi^{0}$ decay channel have been measured at $T_{rm beam} = 2.15$ 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.Received: 30 September 2002, Published online: 22 October 2003PACS: 13.75.Cs Nucleon-nucleon interactions (including antinucleons, deuterons, etc.) - 14.40.Aq , K, and mesons - 25.40.Ve Other reactions above meson production thresholds (energies > 400 MeV)Y. Bedfer: Present address: DAPNIA/SPhN, CEA Saclay, France.A. Brenschede: Present address: Syngenio AG, StuttgartF. Brochard: Present address: LPHNHE, Ecole Polytechnique 91128 Palaiseau, France.Seonho Choi: Present address: Temple University, Philadelphia, PA, USA.R. Dressler: Present address: Paul Scherrer Institut, Villigen, CH-5232.J. Foryciarz: Present address: Motorola Polska Software Center, Kraków, Poland.H.-W. Pfaff: Present address: d-fine GmbH, Eschborn.

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