Deppisch, FF;
Fridell, K;
Harz, J;
(2020)
Constraining lepton number violating interactions in rare kaon decays.
Journal of High Energy Physics
, 2020
(12)
, Article 186. 10.1007/JHEP12(2020)186.
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Abstract
We investigate the possibility to probe lepton number violating (LNV) operators in the rare kaon decay K → πνν. Performing the analysis in the Standard Model effective field theory with only light active Majorana neutrinos, we determine the current limits on the corresponding LNV physics scale from the past E949 experiment at BNL as well as the currently operating experiments NA62 at CERN and KOTO at J-PARC. We focus on the specific signature of scalar currents in K → πνν arising from the LNV nature of the operators and study the effect on the experimental sensitivity, stressing the need for dedicated searches for beyond the SM currents. We find that the rare kaon decays probe high operator scales ΛLNV ≈ 15 to 20 TeV in different quark and neutrino flavours compared to neutrinoless double beta decay. Furthermore, we comment that the observation of LNV in kaon decays can put high-scale leptogenesis under tension. Finally, we discuss the connection with small radiatively generated neutrino masses and show how the severe constraints therefrom can be evaded in a minimal ultraviolet-complete scenario featuring leptoquarks.
| Type: | Article |
|---|---|
| Title: | Constraining lepton number violating interactions in rare kaon decays |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1007/JHEP12(2020)186 |
| Publisher version: | https://doi.org/10.1007/JHEP12(2020)186 |
| Language: | English |
| Additional information: | This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. https://creativecommons.org/licenses/by/4.0/ |
| Keywords: | Beyond Standard Model, Effective Field Theories, Kaon Physics, Neutrino Physics |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10119411 |
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