Ratio of $\bar{\Lambda }/\Lambda$ in Semi-inclusive Electroproduction

Abstract

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.

arXiv comment11 latex files, 6 figures

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Cited by in corpus (2)

• EMC effect in semi-inclusive deep-inelastic scattering process
• Nuclear EMC effect through $\bar{\Lambda }/\Lambda$ production in semi-inclusive deep-inelastic scattering processes