STUDY OF THE ETA(C)(1 S-1(O)) STATE OF CHARMONIUM FORMED IN PP ANNIHILATIONS AND A SEARCH FOR THE ETA'(C)(2 S-1(O))
- ARMSTRONG TA
- BETTONI D
- BHARADWAJ V
- BIINO C
- BLANFORD G
- BORREANI G
- BROEMMELSIEK D
- BUZZO A
- CALABRESE R
- CECCUCCI A
- CESTER R
- CHURCH M
- DALPIAZ P
- P. FERRETTI DALPIAZ
- 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 KJ
- 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 A
- SMITH GA
- SOZZI M
- TROKENHEIM S
- WEBER MF
- WERKEMA S
- ZHANG Y
- ZHAO J
- ZIOULAS G
DOIAbstract
The E760 Collaboration performed an experiment in the Antiproton Accumulator at Fermilab to study the two photon decay of the eta(c)(1(1)S(0)) charmonium state formed in ($) over bar pp annihilations. This resulted in a new measurement of the mass M(eta c) = 2988.3(-3.1)(+3.3) MeV/c(2) and of the product B(eta(c) --> ($) over bar pp) x Gamma(eta(c) --> gamma gamma) = (8.1(-2.0)(+22.9)) eV. We performed a search for the process ($) over bar pp --> eta(c)'(2(1)S(0)) --> gamma gamma over a limited range of center-of-mass energies. Since no signal was observed, we derived upper limits on the product of branching ratios B(eta(c)' --> ($) over bar pp) x B(eta(c)' --> gamma gamma) in the center-of-mass energy range 3584 less than or equal to root ...
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