摘要： The HERMES Collaboration recently reported a reevaluation of the strange-quark parton distribution, S(x), based on kaon production in semi-inclusive deep-inelastic scattering. Two distinct results on S(x) at the x>0.1 region, one with a sizable magnitude and another with a vanishing content, were reported. We show that the latter result is due to a particular assumption adopted in the analysis. The impact of the new HERMES S(x) result on the extraction of intrinsic light-quark sea in the proton is discussed. Given the large uncertainty in the kaon fragmentation function, we find that the latest HERMES data do not exclude the existence of a significant intrinsic strange-quark sea in the proton. The x dependence of the (s+s super(-))/(u super(-)+d super(-)) ratio is also in qualitative agreement with the presence of intrinsic strange-quark sea. 出版日期： 2015-09-15 出處： Physical review. D, 2015-09, Vol.92 (5), Article 054020 識別號： ISSN: 1550-7998 識別號： ISSN: 2470-0010 識別號： EISSN: 1550-2368 識別號： EISSN: 2470-0029 識別號： DOI: 10.1103/PhysRevD.92.054020
