Asymmetries in the Production of ${\Lambda }_c^{+}$ and ${\Lambda }_c^{-}$ Baryons in 500 GeV/c ${\pi }^{-}$ Nucleon Interactions

Abstract

We present a measurement of asymmetries in the production of ${\Lambda }_c^{+}$ and ${\Lambda }_c^{-}$ baryons in 500 GeV/c ${\pi }^{-}$--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 $1819\pm 62$ ${\Lambda }_c$'s observed in the decay channel ${\Lambda }_c\to p{K}^{-}{\pi }^{+}$. We observe more ${\Lambda }_c^{+}$ than ${\Lambda }_c^{-}$ baryons, with an asymmetry of $(12.7\pm 3.4\pm 1.3)$ 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 ${\Lambda }_c$ asymmetry measurement is the first with data in both the positive and negative $x_F$ regions.

11 pages, 3 figures, elsart style (included), LaTeX 2e

References in corpus (1)

• The E791 Parallel Architecture Data Acquisition System

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