2 research outputs found
Recoil Order Chiral Corrections to Baryon Octet Axial Currents
We calculate chiral corrections to the octet axial currents through 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 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, .Comment: RevTex, 19 pages + 2 PS figure
Recoil Order Chiral Corrections to Baryon Octet Axial Currents and Large QCD
We compute the chiral corrections to octet baryon axial currents through
in heavy baryon chiral perturbation theory, including both
octet and decuplet baryon intermediate states. We include the latter in a
consistent way by using the small scale expansion. We find that, in contrast to
the situation at , there exist no cancellations between octet
and decuplet contributions at . Consequently, the corrections spoil the expected scaling behavior of the chiral
expansion. We discuss this result in terms of the expansion. We also
consider the implications for determination of the strange quark contribution
to the nucleon spin from polarized deep inelastic scattering data.Comment: 7 page