Higher partial waves in pp -> pp eta near threshold

Citation
H. Calen et al., Higher partial waves in pp -> pp eta near threshold, PHYS LETT B, 458(2-3), 1999, pp. 190-196
Citations number
28
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
458
Issue
2-3
Year of publication
1999
Pages
190 - 196
Database
ISI
SICI code
0370-2693(19990708)458:2-3<190:HPWIP->2.0.ZU;2-I
Abstract
Exclusive measurements of the production of eta-mesons in the pp-->pp eta r eaction have been carried out at excess energies of 16 and 37 MeV above thr eshold. The deviations from phase space are dominated by the proton-proton final state interaction and this influences particularly the energy distrib ution of the eta-meson. However, evidence is also presented at the higher e nergy for the existence of an anisotropy in the angular distributions of th e eta-meson and also of the final proton-proton pair, probably to be associ ated with D-waves in this system interfering with the dominant S-wave term. The sign of the eta angular anisotropy suggests that rho-exchange is impor tant for this reaction. (C) 1999 Published by Elsevier Science B.V. All rig hts reserved.