Measurement of the γγ partial width of the χ2 charmonium resonance

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. F. Dalpiaz, R. Dibenedetto, D. Dimitroyannis, M. Fabbri, J. Fast, A. Gianoli, C. M. Ginsburg, K. GollwitzerA. Hahn, M. A. Hasan, S. Hsueh, R. Lewis, E. Luppi, M. MacRí, 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, M. G. Pia, P. A. Rapidis, R. Ray, J. Reid, G. Rinaudo, B. Roccuzzo, J. Rosen, A. Santroni, M. Sarmiento, M. Savrié, A. Scalisi, J. Schultz, K. K. Seth, A. Smith, G. A. Smith, M. Sozzi, S. Trokenheim, M. F. Weber, S. Werkema, Y. Zhang, J. Zhao, G. Zioulas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

The E760 Collaboration has studied the reaction p̄p→χ2→ γγ 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(χ2→γγ)=(1.60±0.45) ×10-4 and Γ(χ2→γγ)=321±95 eV.

Original languageEnglish (US)
Pages (from-to)2988-2991
Number of pages4
JournalPhysical review letters
Volume70
Issue number20
DOIs
StatePublished - 1993

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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