Recoil Order Chiral Corrections to Baryon Octet Axial Currents

Details Recoil Order Chiral Corrections to Baryon Octet Axial Currents Recoil Order Chiral Corrections to Baryon Octet Axial Currents

2000-09-13

arxiv.org/abs/hep-ph/0009159v1

Phys.Rev. D63 (2001) 034002

Physics

High Energy Physics

High Energy Physics - Phenomenology

RevTex, 19 pages + 2 PS figures

Scientific paper

10.1103/PhysRevD.63.034002

We calculate chiral corrections to the octet axial currents through ${\cal O}(p^3)$ using baryon chiral perturbation theory (BCPT). The relativistic BCPT framework allows one to sum an infinite series of recoil corrections at a given order in the chiral expansion. We also include SU(3)-breaking operators occuring at ${\cal O}(p^2)$ not previously considered. We determine the corresponding low-energy constants (LEC's) from hyperon semileptonic decay data using a variety of infrared regularization schemes. We find that the chiral expansion of the axial currents does not display the proper convergence behavior, regardless of which scheme is chosen. We explore the implications of our analysis for determinations of the strange quark contribution to the nucleon spin, $\Delta s$.

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