Strangeness Suppression in q-qbar Creation Observed in Exclusive Reactions

Abstract

We measured the ratios of electroproduction cross-sections from a proton target for three exclusive meson-baryon final states: $\Lambda K^{+}$, $p{\pi }^0$, and $n{\pi }^{+}$, with the CLAS detector at Jefferson Lab. Using a simple model of quark hadronization we extract q-qbar creation probabilities for the first time in exclusive two-body production, in which only a single q-qbar pair is created. We observe a sizable suppression of strange quark-antiquark pairs compared to non-strange pairs, similar to that seen in high-energy production.

arXiv comment5pages, 2figures

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• The axial charges of proton within an extended chiral constituent quark model
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• The baryon spectroscopy: strong decays and strange suppression
• Strangeness suppression in the unquenched quark model
• Baryon-antibaryon photoproduction cross sections off the proton