MASS AND GAMMA(3-PI-0) GAMMA(GAMMA-GAMMA) DECAY BRANCHING RATIO OF THE ETA-MESON FROM THE P(GAMMA, ETA)P REACTION/

Authors
KRUSCHE B AHRENS J ANTHONY I ANTON G BECK R FUCHS M GABLER AR HARTER F HALL SJ HLAVAC S KAISER KH KELLIE JD METAG V MILLER GJ OWENS RO PEISE J ROBIGLANDAU M SCHUBERT A SIMON RS STROHER H TRIES V
Citation
B. Krusche et al., MASS AND GAMMA(3-PI-0) GAMMA(GAMMA-GAMMA) DECAY BRANCHING RATIO OF THE ETA-MESON FROM THE P(GAMMA, ETA)P REACTION/, ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI, 351(3), 1995, pp. 237-240
Citations number
24
Categorie Soggetti
Physics, Nuclear","Physics, Particles & Fields
Journal title
ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI → ACNP
ISSN journal
09397922
Volume
351
Issue
3
Year of publication
1995
Pages
237 - 240
Database
ISI
SICI code
0939-7922(1995)351:3<237:MAGGDB>2.0.ZU;2-B
Abstract
Neat threshold photoproduction of eta-mesons from the proton has been measured at, the MAMI accelerator with the TAPS spectrometer. The mass of the eta-meson was deduced from the threshold energy for eta-photop roduction. The result of m(eta)=(547.12 +/- 0.06 +/- 0.25) MeV support s the low value of the eta-mass reported from a dp --> He-3(eta) measu rement at SATURNE in 1992. The eta-decay branching ratio Gamma(3 pi de grees)/Gamma(gamma gamma) was measured to be (0.832 +/-0.005 +/-0.012) .