期刊
PHYSICAL REVIEW D
卷 95, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.95.094017
关键词
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资金
- Perimeter Institute for Theoretical Physics
- DOE [DE-FG02-13ER41958, DE-SC0007983]
- Government of Canada through the Department of Innovation, Science and Economic Development
- Province of Ontario through the Ministry of Research and Innovation
- National Research Council of Canada
- Fermi Research Alliance, LLC [DE-AC02-07CH11359]
- United States Department of Energy
The nucleon spin-averaged forward virtual Compton tensor determines important physical quantities such as electromagnetically induced mass differences of nucleons and two-photon exchange contributions in hydrogen spectroscopy. It depends on two kinematic variables: nu, the virtual photon energy in the proton rest frame, and Q(2), the photon's invariant four-momentum squared. Using the operator product expansion, we calculate the tensor's large-Q(2) behavior for nu = 0, including for the first time the full spin-2 contribution and correcting a previous result in the literature for the spin-0 contribution. Implications for the proton radius puzzle are discussed.
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