Asymmetries in the production of Λ(c)/+ and Λ(c)/- baryons in 500 GeV/c π- nucleon 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, L. M. Cremaldi, C. Darling, K. Denisenko, S. Devmal, A. Fernandez, G. F. FoxP. Gagnon, C. Gobel, K. Gounder, A. M. Halling, G. Herrera, G. Hurvits, C. James, P. A. Kasper, S. Kwan, D. C. Langs, J. Leslie, B. Lundberg, J. Magnin, S. MayTal-Beck, B. 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, F. R.A. Simão, 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

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Abstract

We present a measurement of asymmetries in the production of Λ(c)/+ and Λ(c)/- baryons in 500 GeV/c π--nucleon interactions from the E791 experiment at Fermilab. The asymmetries were measured as functions of Feynman x (x(F)) and transverse momentum squared (p(T)/2) using a sample of 1819 ± 62 Λ(c)'s observed in the decay channel Λ(c)/+ → pK-π+. We observe more Λ(c)/+ than Λ(c)/- baryons, with an asymmetry of (12.7 ± 3.4 ± 1.3)% independent of x(F) and p(T)/2 in our kinematical range (-0.1 ≤ x(F) ≤ 0.6 and 0.0 ≤ p(T)/2 ≤ 8.0 (GeV/c)2). This Λ(c) asymmetry measurement is the first with data in both the positive and negative x(F) regions. (C) 2000 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)42-48
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume495
Issue number1-2
DOIs
StatePublished - 7 Dec 2000

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