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SUMMARY:The proton size radius: experiment vs theory
DTSTART;VALUE=DATE-TIME:20190228T103000Z
DTEND;VALUE=DATE-TIME:20190228T105000Z
DTSTAMP;VALUE=DATE-TIME:20260808T213920Z
UID:indico-contribution-633@indico.inp.nsk.su
DESCRIPTION:Speakers: Alexander Dorokhov (JINR)\nBrief review of the proto
 n radius problem is given. In the framework of the quasipotential method i
 n quantum electrodynamics we calculate the contribution of light pseudosca
 lar (PS) and axial-vector (AV) mesons to the interaction operator of a muo
 n and a proton in muonic hydrogen atom. The coupling of mesons with the mu
 on is via two-photon intermediate state. The parametrization of the transi
 tion form factor of two photons into PS and AV mesons\, based on the exper
 imental data on the transition form factors and QCD asymptotics\, is used.
  Numerical estimates of the contributions to the hyperfine structure of th
 e spectrum of the S and P levels are presented. It is shown that such cont
 ribution to the hyperfine splitting in muonic hydrogen is rather important
  for a comparison with precise experimental data.\n\nhttps://indico.inp.ns
 k.su/event/15/contributions/633/
LOCATION: Conference room
URL:https://indico.inp.nsk.su/event/15/contributions/633/
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