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Titolo:
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))
Autore:
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; 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 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;
Indirizzi:
PENN STATE UNIV UNIVERSITY PK PA 16802 FERMILAB NATL ACCELERATOR LAB BATAVIA IL 60510 UNIV FERRARA I-44100 FERRARA ITALY IST NAZL FIS NUCL I-44100 FERRARA ITALY IST NAZL FIS NUCL I-16146 GENOA ITALY UNIV GENOA I-16146 GENOA ITALY UNIV CALIF IRVINE IRVINE CA 92717 NORTHWESTERN UNIV EVANSTON IL 60208 IST NAZL FIS NUCL I-10125 TURIN ITALY UNIV TURIN I-10125 TURIN ITALY
Titolo Testata:
Physical review. D. Particles and fields
fascicolo: 9, volume: 52, anno: 1995,
pagine: 4839 - 4854
SICI:
0556-2821(1995)52:9<4839:SOTESS>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
HELICITY SELECTION-RULES; ETA-C PRODUCTION; TIME-LIKE REGION; 2-PHOTON COLLISIONS; RADIATIVE DECAY; PARTIAL-WIDTH; J/PSI; ETA-C->PHI-PHI; ETA-C(2980); CALORIMETER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
45
Recensione:
Indirizzi per estratti:
Citazione:
T.A. Armstrong et al., "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))", Physical review. D. Particles and fields, 52(9), 1995, pp. 4839-4854

Abstract

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 ($) over bar pp --> eta(c)'(2(1)S(0)) --> gamma gamma overa limited range of center-of-mass energies. Since no signal was observed, we derived upper limits on the product of branching ratios B(eta(c)' --> ($) over bar pp) x B(eta(c)' --> gamma gamma) in the center-of-mass energy range 3584 less than or equal to root s less than or equal to 3624 MeV. We observed no signal for the nonresonant process ($) over bar p + p --> gamma + gamma and obtain upper limits.

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Documento generato il 30/11/20 alle ore 00:13:35