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FIMP and muon (g − 2) in a U(1)Lμ−Lτ model
KTH, School of Engineering Sciences (SCI), Theoretical Physics. Harish-Chandra Research Institute, India.
2017 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 2017, no 2, 123Article in journal (Refereed) Published
Abstract [en]

The tightening of the constraints on the standard thermal WIMP scenario has forced physicists to propose alternative dark matter (DM) models. One of the most popular alternate explanations of the origin of DM is the non-thermal production of DM via freeze-in. In this scenario the DM never attains thermal equilibrium with the thermal soup because of its feeble coupling strength (∼10−12) with the other particles in the thermal bath and is generally called the Feebly Interacting Massive Particle (FIMP). In this work, we present a gauged U(1)Lμ−Lτ extension of the Standard Model (SM) which has a scalar FIMP DM candidate and can consistently explain the DM relic density bound. In addition, the spontaneous breaking of the U(1)Lμ−Lτ gauge symmetry gives an extra massive neutral gauge boson Zμτ which can explain the muon (g − 2) data through its additional one-loop contribution to the process. Lastly, presence of three right-handed neutrinos enable the model to successfully explain the small neutrino masses via the Type-I seesaw mechanism. The presence of the spontaneously broken U(1)Lμ−Lτ gives a particular structure to the light neutrino mass matrix which can explain the peculiar mixing pattern of the light neutrinos.

Place, publisher, year, edition, pages
Springer, 2017. Vol. 2017, no 2, 123
Keyword [en]
Beyond Standard Model, Cosmology of Theories beyond the SM, Neutrino Physics
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-208152DOI: 10.1007/JHEP02(2017)123ISI: 000395059000006ScopusID: 2-s2.0-85013872869OAI: oai:DiVA.org:kth-208152DiVA: diva2:1104345
Funder
EU, Horizon 2020, 690575 674896
Note

QC 20170601

Available from: 2017-06-01 Created: 2017-06-01 Last updated: 2017-06-01Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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  • de-DE
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