• Anomalies, symmetries and strangeness content of the proton

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      https://www.ias.ac.in/article/fulltext/pram/061/05/0943-0947

    • Keywords

       

      Strange quark; proton

    • Abstract

       

      The matrix elements of the operators of strange quark fieldssГs where Г is 1 orγμγ5 between a proton state is calculated. The sigma term is found to be ≈ 41 MeV and theSU(3) singlet axial matrix element is found to be ≈ 0.22, both in agreement with experiment. The sigma term is found using the trace anomaly, while the determination of the axial vector current matrix element is from QCD sum rules. These correspond to (ie.943-1)≈ 0.12 and for the axial current Δs −0.12, respectively. The role of the anomalies in maintaining flavor symmetry in the presence of substantial differences in quark masses is pointed out. This suggests that there is no need to invoke an intrinsic strange quark component in the proton wave function.

    • Author Affiliations

       

      J Pasupathy1

      1. Center for Theoretical Studies, Indian Institute of Science, Bangalore - 560 012, India
    • Dates

       
  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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