30 July 2023 to 4 August 2023
Alte Mensa
Europe/Berlin timezone

Constraining fundamental physics from ab initio nuclear theory

Not scheduled
20m
AudiMax (Alte Mensa)

AudiMax

Alte Mensa

Johann-Joachim-Becher-Weg 3, 55128 Mainz
Poster Presentation Poster Session

Speaker

Michael Gennari (University of Victoria)

Description

Recent global analysis of Fermi decays within a dispersion relation framework and the corresponding Vud determination have revealed tension with the Standard Model (SM) expectation of Cabibbo-Kobayashi-Maskawa (CKM) matrix unitarity, theoretical confirmation of which would indicate a deficiency within the SM weak sector. Extracting Vud requires electroweak radiative corrections (EWRC) from theory to be applied to the experimentally obtained ft-values. Novel calculations of the pieces sensitive to hadronic structure, i.e., the γW-box, are at the heart of the recent tension. Moreover, to further improve on the extraction of Vud, a modern and consistent treatment of the two nuclear structure dependent corrections is critical. These corrections are (i) δC, the isospin symmetry breaking correction (ii) δNS, the EWRC representing evaluation of the γW-box on a nucleus. Preliminary estimations of δNS have been made in the dispersion relation framework, however the approach cannot include effects from low-lying nuclear states which require a true many-body treatment. Via collaboration with C.Y. Seng and M. Gorshteyn and use of the Lanczos continued fraction method, these corrections are now calculable within the ab initio no-core shell model (NCSM). The NCSM is a nonrelativistic quantum many-body theory for describing low-lying bound states of s- and p-shell nuclei starting solely from nuclear interactions. We will present preliminary results for δNS and δC determined in the NCSM for the 10C10B beta transition, with the eventual goal of extending the calculations to 14O14N and 18Ne18F.

Primary author

Michael Gennari (University of Victoria)

Co-authors

Dr Chien-Yeah Seng (University of Washington) Dr Mikhail Gorshteyn (JGU-Mainz) Petr Navratil (TRIUMF)

Presentation materials

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