TRANSVERSE-MOMENTUM DISTRIBUTIONS OF ETA-MESONS IN NEAR-THRESHOLD RELATIVISTIC HEAVY-ION REACTIONS

Authors
BERG FD PFEIFFER M SCHWALB O FRANKE M KUHN W LOHNER H METAG V NOTHEISEN M NOVOTNY R RASCHKE AE RITMAN J ROBIGLANDAU M SIMON RS SUMBERA M VENEMA L WILSCHUT H
Citation
Fd. Berg et al., TRANSVERSE-MOMENTUM DISTRIBUTIONS OF ETA-MESONS IN NEAR-THRESHOLD RELATIVISTIC HEAVY-ION REACTIONS, Physical review letters, 72(7), 1994, pp. 977-980
Citations number
24
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
72
Issue
7
Year of publication
1994
Pages
977 - 980
Database
ISI
SICI code
0031-9007(1994)72:7<977:TDOEIN>2.0.ZU;2-L
Abstract
Transverse momentum spectra of eta mesons have been measured near the free nucleon-nucleon production threshold in the heavy ion reactions A r-40+Ca-nat, Kr-86+Zr-nat, and Au-197+Au-197 at 1.0A GeV and also in A r-40+Ca-nat at 1.5A GeV. The measured transverse momentum distribution s are compared to model calculations. The relative abundance of Delta( 1232) and N(1535) resonances excited in the collision is deduced. A co mparison to pion data reveals scaling with the transverse mass of the emitted meson.