Exclusive production in pp reactions

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

doi:10.1140/epja/i2002-10229-y

2022 Impact factor 2.7

Hadrons and Nuclei

Eur. Phys. J. A (2003) 18: 331-334
https://doi.org/10.1140/epja/i2002-10229-y

Exclusive production in pp reactions

I. Fröhlich¹^*, F. Balestra², Y. Bedfer³, R. Bertini²^,3, L. C. Bland⁴, A. Brenschede¹, F. Brochard³, M. P. Bussa², Seonho Choi⁴, M. L. Colantoni², R. Dressler⁶, M. Dzemidzic⁴, J.-Cl Faivre³, A. Ferrero², L. Ferrero², J. Foryciarz⁹^,5, V. Frolov⁷, R. Garfagnini², A. Grasso², S. Heinz²^,3, W. W. Jacobs⁴, W. Kühn¹, A. Maggiora², M. Maggiora², A. Manara²^,3, D. Panzieri⁸, H.-W. Pfaff¹, G. Piragino², A. Popov⁷, J. Ritman¹, P. Salabura⁵, V. Tchalyshev⁷, F. Tosello², S. E. Vigdor⁴ and G. Zosi²

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

Abstract

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.