The E760 Collaboration has studied the reaction ppBAR --> chi2 --> gammagamma using a hydrogen gas jet target in the Fermilab antiproton accumulator ring. The following values are obtained for the branching ratio and partial width to two photons; B(chi2 --> gammagamma) = (1.60 +/- 0.45) X 10(-4) and GAMMA(chi2 --> gammagamma) = 321 +/- 95 eV.
Measurement of the γγ partial width of the χ2 charmonium resonance
Bettoni D.;Borreani G.;Calabrese R.;Dalpiaz P.;Gianoli A.;Hasan M. A.;Luppi E.;Martini M.;Menichetti E.;Patrignani C.;Petrucci F.;Savrie M.;
1993
Abstract
The E760 Collaboration has studied the reaction ppBAR --> chi2 --> gammagamma using a hydrogen gas jet target in the Fermilab antiproton accumulator ring. The following values are obtained for the branching ratio and partial width to two photons; B(chi2 --> gammagamma) = (1.60 +/- 0.45) X 10(-4) and GAMMA(chi2 --> gammagamma) = 321 +/- 95 eV.File in questo prodotto:
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