Asymmetries in the Production of $Λ_c^+$ and $Λ_c^-$ Baryons in 500 GeV/c $π^-$ Nucleon Interactions

Details Asymmetries in the Production of $Λ_c^+$ and $Λ_c^-$ Baryons in 500 GeV/c $π^-$ Nucleon Interactions Asymmetries in the Production of $Λ_c^+$ and $Λ_c^-$ Baryons in 500 GeV/c $π^-$ Nucleon Interactions

2000-08-16

arxiv.org/abs/hep-ex/0008029v1

Phys.Lett.B495:42-48,2000

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1016/S0370-2693(00)01239-9

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 $\Lambda_c \to pK^-\pi^+$. We observe more $\Lambda_c^+$ than $\Lambda_c^-$ baryons, with an asymmetry of $(12.7\pm3.4\pm1.3) %$ 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.

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