MEASUREMENT OF THE GAMMA-GAMMA-PARTIAL WIDTH OF THE CHI-2 CHARMONIUM RESONANCE

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 DIBENEDETTO R DIMITROYANNIS D FABBRI M FAST J GIANOLI A GINSBURG CM GOLLWITZER K HAHN A HASAN MA 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 PASTRONE N PATRIGNANI C PEOPLES J PESANDO L PETRUCCI F PIA MG PORDES S RAPIDIS PA RAY R REID J RINAUDO G ROCCUZZO B ROSEN J SANTRONI A SARMIENTO M SAVRIE M SCALISI A SCHULTZ J SETH KK SMITH A SMITH GA SOZZI M TROKENHEIM S WEBER MF WERKEMA S ZHANG Y ZHAO J ZIOULAS G
Citation
Ta. Armstrong et al., MEASUREMENT OF THE GAMMA-GAMMA-PARTIAL WIDTH OF THE CHI-2 CHARMONIUM RESONANCE, Physical review letters, 70(20), 1993, pp. 2988-2991
Citations number
15
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
70
Issue
20
Year of publication
1993
Pages
2988 - 2991
Database
ISI
SICI code
0031-9007(1993)70:20<2988:MOTGWO>2.0.ZU;2-2
Abstract
The E760 Collaboration has studied the reaction ppBAR --> chi2 --> gam magamma using a hydrogen gas jet target in the Fermilab antiproton acc umulator ring. The following values are obtained for the branching rat io and partial width to two photons; B(chi2 --> gammagamma) = (1.60 +/ - 0.45) X 10(-4) and GAMMA(chi2 --> gammagamma) = 321 +/- 95 eV.