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Measurement of the two photon decay of the (Xc0)(1 P-3(0)) state of charmonium

By ANDREOTTI M, BAGNASCO S, BALDINI W, BETTONI D, BORREANI G, BUZZO A, CALABRESE R., CESTER R, CIBINETTO G, DALPIAZ P, GARZOGLIO G, GOLLWITZER KE, GRAHAM M, HU M, JOFFE D, KASPER J, LASIO G, LO VETERE M, LUPPI E, MACRI M, MANDELKERN M, MARCHETTO F, MARINELLI M, MENICHETTI E, METREVELI Z, MUSSA R, NEGRINI M, OBERTINO MM, PALLAVICINI M, PASTRONE N, PATRIGNANI C, PEDLAR TK, PORDES S, ROBUTTI E, ROETHEL W, ROSEN JL, RUMERIO P, RUSACK R, SANTRONI A, SCHULTZ J, SEO SH, SETH KK, STANCARI G, STANCARI M, TOMARADZE A, UMAN I, VIDNOVIC T, WERKEMA S, ZWEBER P and CA FERMILAB E835 COLLABORATION

Abstract

We report on the decay to two photons of the chi(c0) (1(3)P(0)) charmonium resonance formed in (p) over barp interactions at Fermilab experiment E835. We have measured the product of branching ratios BR(chi(c0) --> (p) over barp) x BR(chi(c0) --> gammagamma) = (6.52 +/- 1.18(stat)(-0.72)(+0.48)(sys)) x 10(-8). Using values from the 2002 PDG, this measurement leads to the partial width Gamma(chi(c0) --> gammagamma) = 2.9 +/- 0.9 keV

Topics: RELATIVISTIC QUARK-MODEL, HEAVY QUARKONIUM, ANNIHILATION, RATES, MESONS
Year: 2004
DOI identifier: 10.1016/j.physletb.2004.01.024
OAI identifier: oai:iris.unife.it:11392/1211539
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