Study of the angular distribution of the reaction p̄p→χc2→Jψγ→e+e-γ

T. A. Armstrong*, D. Bettoni, V. Bharadwaj, C. Biino, G. Borreani, D. Broemmelsiek, A. Buzzo, R. Calabrese, A. Ceccucci, R. Cester, M. D. Church, P. Dalpiaz, P. F. Dalpiaz, R. Dibenedetto, D. Dimitroyannis, M. G. Fabbri, J. E. Fast, A. Gianoli, C. M. Ginsburg, K. E. GollwitzerA. A. Hahn, M. A. Hasan, S. Y. Hsueh, R. A. Lewis, E. Luppi, M. MacRí, A. M. Majewska, M. A. Mandelkern, F. Marchetto, M. Marinelli, J. L. 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, S. Pordes, P. A. Rapidis, R. E. Ray, J. D. Reid, G. Rinaudo, B. Roccuzzo, J. L. 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. J. Werkema, Y. Zhang, J. L. Zhao, G. Zioulas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


We report on a study of the angular distribution in the reaction p̄p→χc2→Jψγ→e+e-γ. Using a sample of 1904 events, we find that the contribution of helicity zero in the formation process is B02<0.22 (90% C.L.), and that the normalized quadrupole amplitude in the radiative decay is a2=-0.14±0.06. The normalized radiative decay octupole amplitude a3 is found to be consistent with zero.

Original languageEnglish (US)
Pages (from-to)3037-3044
Number of pages8
JournalPhysical Review D
Issue number7
StatePublished - 1993

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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