29 May 2018 to 3 June 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

30 May 2018, 18:10
20m
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

Speaker

Dr Mikhail Gorshteyn (Mainz University)

Description

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