Ratio of $\barΛ/Λ$ in Semi-inclusive Electroproduction

Details Ratio of $\barΛ/Λ$ in Semi-inclusive Electroproduction Ratio of $\barΛ/Λ$ in Semi-inclusive Electroproduction

2004-02-29

arxiv.org/abs/hep-ph/0403010v1

Phys.Lett. B574 (2003) 35-40

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 latex files, 6 figures

Scientific paper

It is shown that the $\bar{\Lambda}/\Lambda$ cross section ratio in semi-inclusive electroproduction of $\Lambda$ and $\bar{\Lambda}$ hyperons in deep inelastic scattering of charged lepton on a nucleon target, can provide useful information on the quark to $\Lambda$ fragmentation functions. This ratio is calculated explicitly in a quark-diquark model, a pQCD based analysis, and an SU(3) symmetry model, with three different options for the contribution from the unfavored fragmentation functions. The $x$-dependence of this ratio is sensitive to the ratio of unfavored fragmentation functions over favored fragmentation functions, $D_{\bar{u}}^{\Lambda}(z)/D_{u}^{\Lambda}(z)$, whereas the $z$-dependence is sensitive to the flavor structure of the fragmentation functions, i.e., the ratio $D_u^{\Lambda}(z)/D_s^{\Lambda}(z)$. Future measurements by the HERMES Collaboration at DESY can discriminate between various cases.

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