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- W2280851215 abstract "We compute the $s-bar s$ asymmetry in the proton in chiral effective theory, using phenomenological constraints based upon existing data. 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 identify a valence-like component of $s(x)$ which is balanced by a $delta$-function contribution to $bar s(x)$ at $x=0$, so that the integrals of $s$ and $bar s$ over the experimentally accessible region $x > 0$ are not equal. Using a regularization procedure that preserves chiral symmetry and Lorentz invariance, we find that existing data limit the integrated value of the second moment of the asymmetry to the range $-0.07 times 10^{-3} leq langle x(s-bar s) rangle leq 1.12 times 10^{-3}$ at a scale of $Q^2=1 $GeV$^2$. This is too small to account for the NuTeV anomaly and of the wrong sign to enhance it." @default.
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- W2280851215 date "2016-11-01" @default.
- W2280851215 modified "2023-09-26" @default.
- W2280851215 title "Constraints on the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si1.gif overflow=scroll><mml:mi>s</mml:mi><mml:mo>−</mml:mo><mml:mover accent=true><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mo stretchy=false>¯</mml:mo></mml:mrow></mml:mover></mml:math> asymmetry of the proton in chiral effective theory" @default.
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- W2280851215 doi "https://doi.org/10.1016/j.physletb.2016.09.014" @default.
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