Bochum 2018 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 22: Hadron Structure and Spectroscopy IV
HK 22.3: Talk
Tuesday, February 27, 2018, 17:15–17:30, HZO 50
Radiative corrections to the magnetic moments of proton and neutron — •Norbert Kaiser — Physik Department, Technische Universität München, 85748 Garching
The radiative corrections of order α/π to the magnetic moments of the proton and the neutron are estimated. The photon-loop dia- gram of the vertex-correction type is evaluated with phenomenological nucleon vector form factors. Infrared-finiteness and gauge-invariance require the inclusion of the wave-function renormalization factor from the self-energy diagram. Using recent empirical form factor parametrizations the corrections amount to δκp= −3.42 · 10−3 and δκn= 1.34 · 10−3. The effects from photon-loops with internal Δ(1232)-isobars are also studied. For two customary versions of the Δ Nγ -vertex and spin-3/2 propagator, these radiative corrections have values of δκp(Δ)= (−0.9, 0.0)· 10−3 and δκn(Δ) = (1.2, −0.8)· 10−3, respectively. Taking these ranges as a systematic error, our estimates read δκp = (−3.9± 0.4) · 10−3 and δκn = (1.5± 1.0) · 10−3.
This work has been supported in part by DFG and NSFC (CRC110).