期刊
PHYSICS LETTERS B
卷 784, 期 -, 页码 373-377出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2018.07.060
关键词
Nucleon form factors; Proton radius puzzle; Dispersion relations; Chiral effective field theory
资金
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC05-06OR23177]
- Community of Madrid through the Programa de atraccion de talento investigador 2017 (Modalidad 1)
- Spanish MECD grant [FPA2016-77313-P, FPA2016-75654-C2-2-P]
- group UPARCOS
We present a theoretical parametrization of the nucleon electromagnetic form factors (FFs) based on a combination of chiral effective field theory and dispersion analysis. The isovector spectral functions on the two-pion cut are computed using elastic unitarity, chiral pion-nucleon amplitudes, and timelike pion FF data. Higher-mass isovector and isoscalar t-channel states are described by effective poles, whose strength is fixed by sum rules (charges, radii). Excellent agreement with the spacelike proton and neutron FF data is achieved up to Q(2)similar to 1 GeV2. Our parametrization provides proper analyticity and theoretical uncertainty estimates and can be used for low-Q(2) FF studies and proton radius extraction. (c) 2018 The Authors. Published by Elsevier B.V.
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