OBSERVATION OF THE RADIATIVE DECAY J PSI-]E(+)E(-)GAMMA/

Authors
ARMSTRONG TA BETTONI D BHARADWAJ V BIINO C BORREANI G BROEMMELSIEK D BUZZO A CALABRESE R CECCUCCI A CESTER R CHURCH M DALPIAZ P DALPIAZ PF DIMITROYANNIS D FABBRI M FAST J GIANOLI A GINSBURG CM GOLLWITZER K GOVI G HAHN A HASAN M HSUEH S LEWIS R LUPPI E MACRI M MAJEWSKA AM MANDELKERN M MARCHETTO F MARINELLI M MARQUES J MARSH W MARTINI M MASUZAWA M MENICHETTI E MIGLIORI A MUSSA R PALESTINI S PALLAVICINI M PASSAGGIO S PASTRONE N PATRIGNANI C PEOPLES J PETRUCCI F PIA MG PORDES S RAPIDIS P RAY R REID J RINAUDO G ROCCUZZO B ROSEN J SANTRONI A SARMIENTO M SAVRIE M SCHULTZ J SETH KK SMITH AJ SMITH GA SOZZI M TROKENHEIM S WEBER MF WERKEMA S ZHANG Y ZHAO J ZIOULAS G
Citation
Ta. Armstrong et al., OBSERVATION OF THE RADIATIVE DECAY J PSI-]E(+)E(-)GAMMA/, Physical review. D. Particles and fields, 54(11), 1996, pp. 7067-7070
Citations number
14
Categorie Soggetti
Physics, Particles & Fields
Journal title
Physical review. D. Particles and fields → ACNP
ISSN journal
05562821
Volume
54
Issue
11
Year of publication
1996
Pages
7067 - 7070
Database
ISI
SICI code
0556-2821(1996)54:11<7067:OOTRDJ>2.0.ZU;2-B
Abstract
We report the first observation of the (radiative) decay J/psi-->e(+)e (-)gamma. Our data are from an experiment in which J/psi is formed in antiproton-proton annihilations. The observed rate is consistent with a QED calculation based on final state radiation. Our measurement give s a branching ratio for this mode of (8.8 +/- 1.3 +/- 0.4) x 10(-3) fo r gamma energy > 100 MeV.