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Volume 281 - The 26th International Nuclear Physics Conference (INPC2016) - QCD: Partonic phenomena – Monday 12
Constraints On The sbar-s Asymmetry Of The Proton In Chiral Effective Theory
X. Wang
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Pre-published on: 2017 May 04
Published on: 2017 May 09
We investigate the $s-\bar s$ asymmetry in the proton in chiral effective theory. Unlike previous meson cloud model calculations, which accounted for kaon loop contributions with on-shell intermediate states alone, this work includes off-shell terms and contact interactions, which impact the shape of the $s-\bar s$ difference. We use the hyperon production data and the latest results from global PDF fits to constrain the parameters within Pauli-Villars regularization procedure, which preserves chiral symmetry and Lorentz invariance. We also extract the correction to the NuTeV anomaly from strange asymmetry effect.
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