Aug 8 – 13, 2022
Hörsaalzentrum Poppelsdorf
Europe/Berlin timezone

Preliminary Lattice QCD Study of nn → ppee Matrix Elements for Neutrinoless Double-Beta Decay

Aug 12, 2022, 3:10 PM
20m
CP1-HSZ/Ground-0.001 - HS3 (CP1-HSZ)

CP1-HSZ/Ground-0.001 - HS3

CP1-HSZ

50
Oral Presentation QCD in searches for physics beyond the Standard Model QCD in searches for physics beyond the Standard Model

Speaker

Anthony Grebe (MIT)

Description

Experimental searches for neutrinoless double-beta decay aim to determine whether the neutrinos are Dirac or Majorana fermions. Interpreting double-beta half-lives or experimental exclusions in terms of neutrino physics requires knowledge of the nuclear matrix elements, which are currently estimated from various nuclear models and carry a large model uncertainty. This talk will present preliminary results from a first-principles lattice QCD calculation of the short-distance (from a heavy intermediate Majorana neutrino) and long-distance (from a light Majorana neutrino) nuclear matrix elements for the simple $nn \rightarrow ppee$ transition at an artificially heavy quark mass, where the dineutron is a bound state. Such results can provide input for nuclear EFTs that can be extrapolated to nuclei of interest to reduce model uncertainties.

Primary authors

Anthony Grebe (MIT) Dr David Murphy Patrick Oare (MIT) William Detmold (MIT) Dr Zhenghao Fu (MIT)

Presentation materials