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arXiv · 1711.00839

Valence Quark and Gluon Distributions of Kaon from J/Psi Production

Jen-Chieh Peng·Wen-Chen Chang·Stephane Platchkov·Takahiro Sawada
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Abstract

The only experimental information on the parton distribution of kaons was obtained from the scarce kaon-induced Drell-Yan cross section data. From these data, evidence for a valence $u$ quark distribution of kaon softer than that of pion was found. We study the feasibility to extract kaon's valence quark distribution via the existing kaon-induced J/psi production data. We compare the NA3 data on the K- / pi- and K+ / pi+ ratios for J/psi production on a platinum target with theoretical calculations based on the color-evaporation model. We show that the NA3 data on J/psi production provide an independent evidence for a valence $u$ quark distribution softer in kaon than in pion. The data also suggest different gluon distributions for kaon and pion.

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Jen-Chieh Peng, Wen-Chen Chang, Stephane Platchkov, Takahiro Sawada. 2017-11-02. Valence Quark and Gluon Distributions of Kaon from J/Psi Production. https://arxiv.org/abs/1711.00839

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