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Abstract: We consider the dispersion correction to elastic parity violatingelectron-proton scattering due to \gammaZ exchange. In a recent publication,this correction was reported to be substantially larger than the previousestimates. In this paper, we study the dispersion correction in greater detail.We confirm the size of the disperion correction to be 6% for the QWEAKexperiment designed to measure the proton weak charge. We enumerate parametersthat have to be constrained to better than relative 30% in order to keep thetheoretical uncertainty for QWEAK under control.



Autor: M. Gorchtein, C.J. Horowitz, M.J. Ramsey-Musolf

Fuente: https://arxiv.org/



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