[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Monday, July 6, 2015
1:00 p.m. (coffee at 12:45 p.m.)
CEBAF Center, F113

Chueng-Ryon Ji
North Carolina State University


*Flavor Asymmetry of the Proton Sea in Chiral Effective Theory*

While the leading nonanalytic behavior in chiral effective theory must be universal,
there has been a puzzling factor 4/3 difference in the coefficient of the leading
nonanalytic contribution to the vertex renormalization constant of the nucleon or
equivalently that of the pion for more than a decade. We have recently resolved this
lingering factor difference by carefully analyzing the vertex renormalization constant
with both pseudovector and pseudoscalar coupling theories and demonstrated how one may
correctly achieve the equivalence between these two theories. We discuss this resolution
with respect to the phenomenological application to the flavor asymmetry in the proton
sea from the chiral effective theory. The on-shell splitting function of the pion from
the nucleon has a direct consequence for the analysis of the leading neutron production
at HERA as well as the proposed measurement of tagged deep inelastic scattering (TDIS)
at JLab.

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