May 29, 2018 to June 3, 2018
Hyatt Regency Indian Wells Conference Center
US/Pacific timezone

New Evaluation of the $\gamma W$-box Correction to $0^+-0^+$ Nuclear $\beta$-Decay and $V_{ud}$ Extraction

May 30, 2018, 6:10 PM
North Foyer | Kachina Room (Hyatt Regency Indian Wells Conference Center)

North Foyer | Kachina Room

Hyatt Regency Indian Wells Conference Center

44600 Indian Wells Lane, Indian Wells, CA 92210, USA


Dr Mikhail Gorshteyn (Mainz University)


Current most precise knowledge of the value of $V_{ud}$ is obtained from the analysis of a number of superallowed nuclear $\beta$-decays. At present, the main limitation in precision of this determination is due to radiative corrections, more specifically the "inner" $\gamma W$-box correction that is independent of the electron spectrum but depends on hadronic structure. A novel dispersion formulation of the $\gamma W$-box is developed. It allows to test the validity and improve the previous evaluation of Marciano and Sirlin, which was based on several semi-empiric assumptions. Further effects, such as possible effects of the nuclear excitations both on inner and outer corrections are discussed.
E-mail [email protected]

Primary author

Dr Mikhail Gorshteyn (Mainz University)

Presentation materials