Photoproduction of the Λ<inf>c</inf> charmed baryon

M. P. Alvarez, R. Barate, D. Bloch, P. Bonamy, P. Borgeaud, M. Burchell, H. Burmeister, J. M. Brunet, F. Calvino, M. Cattaneo, J. M. Crespo, B. d'Almagne, M. David, L. DiCiaccio, J. Dixon, P. Druet, A. Duane, J. P. Engel, A. Ferrer, T. A. FilippasE. Fokitis, R. W. Forty, P. Foucault, E. N. Gazis, J. P. Gerber, Y. Giomataris, T. Hofmokl, E. C. Katsoufis, M. Koratzinos, C. Krafft, B. Lefievre, Y. Lemoigne, A. Lopez, W. K. Lui, C. Magneville, A. Maltezos, J. G. McEwen, Th Papadopoulou, B. Pattison, D. Poutot, M. Primout, H. Rahmani, P. Roudeau, C. Seez, J. Six, R. Strub, D. Treille, P. Triscos, G. Tristram, G. Villet, A. Volte, M. Wayne, D. M. Websdale, G. Wormser, Y. Zolnierowski

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Abstract

In a photoproduction experiment using a mean photon energy of 100 GeV we have observed 29±8 Λc(Λc) charmed-baryon and antibaryon decays in the pK-π+ (pK+π-) final state. Quasi two-body final states do not contribite significantly to this channel. The mass of the Λc was measured to be 2281.7±2.7±2.6 MeV/c2 and its lifetime 0.18±0.03±0.03 ps. The ratio of Λc D production, measured in this experiment, is significantly greater than that predicted by photon-gluon fusion and using a Lund model to describe the hadronization. This excess cannot be completely accounted for in this model, even using a Λc branching fraction in pKπ as high as 5%. © 1990.
Original languageEnglish
Pages (from-to)256-260
JournalPhysics Letters B
Volume246
Issue number1-2
DOIs
Publication statusPublished - 23 Aug 1990

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