The Quark-Antiquark Asymmetry of the Nucleon Sea from $Λ$ and $\barΛ$ Fragmentation

Details The Quark-Antiquark Asymmetry of the Nucleon Sea from $Λ$ and $\barΛ$ Fragmentation The Quark-Antiquark Asymmetry of the Nucleon Sea from $Λ$ and $\barΛ$ Fragmentation

2000-05-22

arxiv.org/abs/hep-ph/0005210v1

Phys.Lett. B488 (2000) 254-260; Phys.Lett. B489 (2000) 293-299

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 latex pages, 2 figures

Scientific paper

10.1016/S0370-2693(00)00940-0

We present a general analysis of the spin transfer for $\Lambda$ and $\bar{\Lambda}$ production in deep-inelastic scattering of polarized charged leptons on the nucleon, and find that the pattern of different behaviors of $\Lambda$ and $\bar{\Lambda}$ production observed by the E665 Collaboration suggests the possibility of quark-antiquark asymmetries either in the quark to $\Lambda$ fragmentation functions and/or in the quark and antiquark distributions of the target proton. We also point out that the strange-antistrange asymmetry of the nucleon sea may produce an observable contribution to the different behaviors of $\Lambda$ and $\bar{\Lambda}$ production. We find that a softer $\bar{s}(x)$ than $s(x)$ as predicted by the light-cone baryon-meson fluctuation model of intrinsic quark-antiquark pairs of the nucleon sea might lead to a reasonable picture. However, the magnitude is still too small to explain the E665 data and the conclusion has also strong model-dependence. This may suggest the importance of quark-antiquark asymmetry in the quark to $\Lambda$ fragmentation functions, provided that the E665 data are confirmed.

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