Abstract
We re-analyze the flavor decomposition of the pion-nucleon σ-term in the framework of baryon chiral perturbation to fourth order. We employ a covariant and the heavy baryon framework including also the low-lying decuplet. Using only continuum data, we find a small strangeness content of the proton. The uncertainties are, however, large and might be overcome by dedicated lattice QCD calculations.
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Severt, D., Meißner, UG. & Gegelia, J. Flavor decomposition of the pion-nucleon σ-term. J. High Energ. Phys. 2019, 202 (2019). https://doi.org/10.1007/JHEP03(2019)202
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DOI: https://doi.org/10.1007/JHEP03(2019)202