Search for the pentaquark via the Pcs0 → K * 0K- p decay

E. M. Aitala*, S. Amato, J. C. Anjos, J. A. Appel, D. Ashery, S. Banerjee, I. Bediaga, G. Blaylock, S. B. Bracker, P. R. Burchat, R. A. Burnstein, T. Carter, H. S. Carvalho, N. K. Copty, L. M. Cremaldi, C. Darling, K. Denisenko, A. Fernandez, G. F. Fox, P. GagnonS. Gerzon, C. Gobel, K. Gounder, A. M. Hailing, G. Herrera, G. Hurvits, C. James, P. A. Kasper, S. Kwan, D. C. Langs, J. Leslie, J. Lichtenstadt, B. Lundberg, S. MayTal-Beck, B. T. Meadows, J. R.T. De Mello Neto, D. Mihalcea, R. H. Milburn, J. M. De Miranda, A. Napier, A. Nguyen, A. B. D'Oliveira, K. O'Shaughnessy, K. C. Peng, L. P. Perera, M. V. Purohit, B. Quinn, S. Radeztsky, A. Rafatian, N. W. Reay, J. J. Reidy, A. C. Dos Reis, H. A. Rubin, D. A. Sanders, A. K.S. Santha, A. F.S. Santoro, A. J. Schwartz, M. Sheaff, R. A. Sidwell, A. J. Slaughter, M. D. Sokoloff, J. Solano, N. R. Stanton, R. J. Stefanski, K. Stenson, D. J. Summers, S. Takach, K. Thorne, A. K. Tripathi, S. Watanabe, R. Weiss-Babai, J. Wiener, N. Witchey, E. Wolin, S. M. Yang, D. Yi, S. Yoshida, R. Zaliznyak, C. Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We have searched for evidence of the production and decay of a neutral bound-state pentaquark, one of a predicted doublet of states: Pc̄s0 = |c̄suud〉 and Pc̄s- = |c̄sddu〉. Specifically, we have searched for the decay Pc̄s0 → K * 0K- p in data from Fermilab experiment E791, in which a 500 GeV/e π- beam interacted with nuclear targets. We find mass-dependent upper limits at the 90% confidence level for the ratio of cross section times branching fraction of this decay relative to that for the decay Ds- → K * 0K-. The upper limits vary between 0.016 and 0.036 for M(Pc̄s0) between 2.75 and 2.91 GeV/c2, assuming a pentaquark lifetime of 0.4 ps.

Original languageEnglish
Pages (from-to)303-310
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3-4
StatePublished - 1999


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