Asymmetry of the strange sea in nucleons
Abstract
Based on finitetemperature field theory, we evaluate medium effects in the nucleon, which can induce an asymmetry between quarks and antiquarks of the strange sea. The shortdistance effects determined by the weak interaction can give rise to δm≡∆m_{s}∆m_{sbar} where ∆m_{s(sbar)} is the mediuminduced mass of the strange quark of a few keV at most, but the longdistance effects caused by strong interaction are sizable. Our numerical results show that there exists an obvious mass difference between strange and antistrange quarks, as large as 10100 MeV.
 Publication:

Physical Review D
 Pub Date:
 January 2002
 DOI:
 10.1103/PhysRevD.65.014003
 arXiv:
 arXiv:hepph/0111183
 Bibcode:
 2002PhRvD..65a4003L
 Keywords:

 12.40.y;
 11.10.Wx;
 11.30.Na;
 14.20.Dh;
 Other models for strong interactions;
 Finitetemperature field theory;
 Nonlinear and dynamical symmetries;
 Protons and neutrons;
 High Energy Physics  Phenomenology;
 High Energy Physics  Experiment;
 Nuclear Theory
 EPrint:
 15 latex pages, 3 figures, to appear in PRD