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Measurement of the γγ partial width of the χ 2 charmonium resonance

1993; American Physical Society; Volume: 70; Issue: 20 Linguagem: Inglês

10.1103/physrevlett.70.2988

1092-0145

T. A. Armstrong, D. Bettoni, V. Bharadwaj, C. Biino, G. Borreani, D. Broemmelsiek, A. Buzzo, R. Calabrese, A. Ceccucci, R. Cester, M. Church, P. Dalpiaz, P. Dalpiaz, R. Dibenedetto, D. Dimitroyannis, M. Fabbri, J. Fast, A. Gianoli, C. M. Ginsburg, K. Gollwitzer, A. Hahn, M. A. Hasan, S. Hsueh, R. Lewis, E. Luppi, M. Macrı́, A. M. Majewska, M. Mandelkern, F. Marchetto, M. Marinelli, J. Marques, W. Marsh, M. Martini, M. Masuzawa, E. Menichetti, A. Migliori, R. Mussa, S. Palestini, M. Pallavicini, N. Pastrone, C. Patrignani, J. Peoples, L. Pesando, F. Petrucci, Maria Grazia Pia, P. A. Rapidis, R. Ray, John D. Reid, G. Rinaudo, B. Roccuzzo, J. Rosen, A. Santroni, M. Sarmiento, M. Savriè, Aurora Scalisi, J. Schultz, K. K. Seth, A. Smith, G. A. Smith, M. Sozzi, S. Trokenheim, Martin Weber, S. Werkema, Y. Zhang, Jing Zhao, G. Zioulas,

High-Energy Particle Collisions Research

The E760 Collaboration has studied the reaction p\ifmmode\bar\else\textasciimacron\fi{}p\ensuremath{\rightarrow}${\mathrm{\ensuremath{\chi}}}_{2}$\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma} using a hydrogen gas jet target in the Fermilab antiproton acumulator ring. The following values are obtained for the branching ratio and partial width to two photons; B(${\mathrm{\ensuremath{\chi}}}_{2}$\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma})=(1.60\ifmmode\pm\else\textpm\fi{}0.45)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}4}$ and \ensuremath{\Gamma}(${\mathrm{\ensuremath{\chi}}}_{2}$\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma})=321\ifmmode\pm\else\textpm\fi{}95 eV.