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$\pi$N and strangeness sigma terms at the physical point with chiral fermions

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arxiv 1511.09089 v3 pith:2UU567S6 submitted 2015-11-29 hep-lat hep-ph

Yi-Bo Yang , Andrei Alexandru , Terrence Draper , Jian Liang , Keh-Fei Liu This is my paper · ORCID
classification hep-lathep-ph
keywords sigmachiralfermionslightmatrixscalarstrangestrangeness
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

Lattice QCD calculations with chiral fermions of the $\pi$N sigma term $\sigma_{\pi N}$ and strangeness sigma term $\sigma_{sN}$ including chiral interpolation with continuum and volume corrections are provided in this work, with the excited-state contaminations subtracted properly. We calculate the scalar matrix element for the light/strange quark directly and find $\sigma_{\pi N}=45.9(7.4)(2.8)$ MeV, with the disconnected insertion part contributing 20(12)(4)\%, and $\sigma_{sN}=40.2(11.7)(3.5)$ MeV, which is somewhat smaller than $\sigma_{\pi N}$. The ratio of the strange/light scalar matrix elements is $y$ = 0.09(3)(1).

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