Yang Fu, MIT, [HET Seminar], Two-photon exchange contribution to muonic-hydrogen from lattice QCD

US/Eastern
CFNS Library (https://bnl.zoomgov.com/j/1605506805?pwd=AA9rwL4hM5AwG2b0zEwDdXjzhvJjSz.1)

CFNS Library

https://bnl.zoomgov.com/j/1605506805?pwd=AA9rwL4hM5AwG2b0zEwDdXjzhvJjSz.1

Description

Proton is one of the basic building blocks of all atoms, the accurate knowledge about the proton charge radius not only leaves us useful information on the size and structure of the proton, but also provides crucial precision tests of the Standard Model at low energy. In addition, It also has an impact on the Rydberg constant, one of the most accurately measured physical constants. The most precise determination of proton charge radius is extracted from the measurement of muonic-hydrogen spectrum, while the largest theoretical uncertainty is dominated by the hadronic effect called two-photon exchange. In this talk, I will present the first lattice QCD calculation of the two-photon exchange contribution, as well as a result from joint dispersion relation and lattice QCD.

The agenda of this meeting is empty