Mass splitting and production of Σ0c and Σ++c measured in 500 GeV π--N interactions

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, I. Costa, L. M. Cremaldi, C. Darling, K. Denisenko, J. Engelfried, A. FernandezP. Gagnon, S. Gerzon, K. Gounder, A. M. Halling, G. Herrera, G. Hurvits, C. James, P. A. Kasper, N. Kondakis, S. Kwan, D. C. Langs, J. Leslie, J. Lichtenstadt, B. Lundberg, A. Manacero, S. MayTal-Beck, B. Meadows, J. R.T. De Mello Neto, 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, A. K.S. Santha, A. F.S. Santoro, A. J. Schwartz, M. Sheaff, R. A. Sidwell, A. J. Slaughter, J. G. Smith, M. D. Sokoloff, N. R. Stanton, K. Sugano, D. J. Summers, S. Takach, K. Thorne, A. K. Tripathi, S. Watanabe, R. Weiss-Babai, J. Wiener, N. Witchey, E. Wolin, D. Yi, R. Zaliznyak, C. Zhang

*Corresponding author for this work

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11 Scopus citations


From a sample of 2722 ± 78 Λ+c decaying to the pK- π+ final state, we have observed, in the hadroproduction experiment E791 at Fermilab, 143 ± 20 Σ0c and 122 ± 18 Σ++c through their decays to Λ+cπ±. The mass difference M(Σ0c) - M(Λ+c) is measured to be (167. 38± 0.29 ± 0.15) MeV; for M(Σ++c) - M(Λ+c), we find (167.76 ± 0.29 ± 0.15) MeV. The rate of Λ+c production from decays of the Σc triplet is (22 ± 2 ± 3) % of the total Λ+c production assuming equal rate of production from all three, as measured for Σ0c and Σ++c. We do not observe a statistically significant Σc baryon-antibaryon production asymmetry. The χF and p2t spectra of A+c from Λ+c decays are observed to be similar to those for all A+c's produced.

Original languageEnglish
Pages (from-to)292-298
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-4
StatePublished - 27 Jun 1996


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