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

*Corresponding author for this work

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26 Scopus citations


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
Issue number1-2
StatePublished - 7 Dec 2000


FundersFunder number
Conselho Nacional de Desenvolvimento Cientı́fico e Tecnológico
Universities Research Associates, Inc.
National Science Foundation
U.S. Department of Energy
United States-Israel Binational Science Foundation
Consejo Nacional de Ciencia y Tecnología


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