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Uncovering a chirally suppressed mechanism of 0νββ decay with LHC searches

Graesser, Michael L. and Li, Gang and Ramsey-Musolf, Michael J. and Shen, Tianyang and Urrutia-Quiroga, Sebastián (2022) Uncovering a chirally suppressed mechanism of 0νββ decay with LHC searches. Journal of High Energy Physics, 2022 (10). Art. No. 34. ISSN 1029-8479. doi:10.1007/jhep10(2022)034.

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∆L = 2 lepton number violation (LNV) at the TeV scale could provide an alternative interpretation of positive signal(s) in future neutrinoless double beta (0νββ) decay experiments. An interesting class of models from this point of view are those that at low energies give rise to dimension-9 vector operators and a dimension-7 operator, both of whose 0νββ-decay rates are "chirally suppressed". We study and compare the sensitivities of 0νββ-decay experiments and LHC searches to a simplified model in this class of TeV-scale LNV that is also SU(2)_L × U(1)_Y gauge invariant. The searches for 0νββ decay, which are here diluted by a chiral suppression of the vector operators, are found to be less constraining than LHC searches whose reach is increased by the assumed kinematic accessibility of the mediator particles. For the chirally suppressed dimension-7 operator generated by TeV-scale mediators, in contrast, 0νββ-decay searches place strong constraints on the size of the new Yukawa coupling. Signals of this model at the LHC and 0νββ-decay experiments are entirely uncorrelated with the observed neutrinos masses, as these new sources of LNV give negligible contributions to the latter. We find the prospects for the high-luminosity LHC and ton-scale 0νββ-decay experiments to uncover the chirally-suppressed mechanism with TeV-scale LNV to be promising. We also comment on the sensitivity of the 0νββ-decay lifetime to certain unknown low-energy constants that in the case of dimension-9 scalar operators are expected to be large due to non-perturbative renormalization.

Item Type:Article
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URLURL TypeDescription
Graesser, Michael L.0000-0003-0531-436X
Li, Gang0000-0003-2232-5140
Ramsey-Musolf, Michael J.0000-0001-8110-2479
Urrutia-Quiroga, Sebastián0000-0002-4669-2132
Additional Information:Article funded by SCOAP3. We would like to thank Daniele S.M. Alves, Yi-Lun Chung, Glen Cowan, Juan Carlos Helo, Xiao-Dong Ma, Emanuele Mereghetti, and Stephane Willocq for very helpful discussions and correspondence. The work of MLG is supported by the LDRD program at Los Alamos National Laboratory and by the U.S. Department of Energy, Office of High Energy Physics, under Contract No. DE-AC52-06NA25396. The work of SUQ was supported by ANID-PFCHA/DOCTORADO BECAS CHILE/2018-72190146. GL, SUQ, and MJRM were partially funded under the US Department of Energy contract number DE-SC0011095. GL was also supported in part by the Fundamental Research Funds for the Central Universities, China, Sun Yat-sen University. MJRM was also supported in part under National Science Foundation of China grant number 19Z103010239.
Group:Kellogg Radiation Laboratory
Funding AgencyGrant Number
Los Alamos National LaboratoryUNSPECIFIED
Department of Energy (DOE)DE-AC52-06NA25396
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)2018-72190146
Department of Energy (DOE)DE-SC0011095
Fundamental Research Funds for the Central UniversitiesUNSPECIFIED
National Natural Science Foundation of China19Z103010239
Issue or Number:10
Record Number:CaltechAUTHORS:20221017-14321300.27
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117465
Deposited By: Research Services Depository
Deposited On:21 Oct 2022 01:21
Last Modified:25 Oct 2022 19:27

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