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arXiv · 1501.07218

Model-independent calculation of $SU(3)_f$ violation in baryon octet light-cone distribution amplitudes

Philipp Wein·Andreas Schäfer
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Abstract

In this work we present a minimal parametrization of the light-cone distribution amplitudes of the baryon octet including higher twist contributions. Simultaneously we obtain the quark mass dependence of the amplitudes at leading one-loop accuracy by the use of three-flavor baryon chiral perturbation theory (BChPT), which automatically yields model-independent results for the leading $SU(3)$ flavor breaking effects. For that purpose we have constructed the nonlocal light-cone three-quark operators in terms of baryon octet and meson fields and have carried out a next-to-leading order BChPT calculation. We were able to find a minimal set of distribution amplitudes (DAs) that do not mix under chiral extrapolation towards the physical point and naturally embed the $Λ$ baryon. Additionally they are chosen in such a way that all DAs of a certain symmetry class have a similar quark mass dependence (independent of the twist of the corresponding amplitude), which allows for a compact presentation. The results are well-suited for the extrapolation of lattice data and for model building.

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Philipp Wein, Andreas Schäfer. 2015-11-18. Model-independent calculation of $SU(3)_f$ violation in baryon octet light-cone distribution amplitudes. https://doi.org/10.1007/jhep05(2015)073

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