Asymmetries in the production of Lambda(c)+ and Lambda(c)- baryons in 500-GeV/c pi- nucleon interactions

E.M. Aitala, S. Amato,J. C. Anjos,J. A. Appel,Daniel Ashery,Sudeshna 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. L. Darling, K. Denisenko, S. Devmal,A. Fernandez,G. F. Fox,P. Gagnon, C. Göbel, K. Gounder,A.M. Halling,G. Herrera, G. Hurvits,C. James,P.A. Kasper,Simon Kwan,D.C. Langs, J. Leslie,B. Lundberg,J. Magnin, 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,Alberto 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,Kevin 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

Physics Letters B（2000）

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摘要

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 1 819±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.

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