Vector dark matter with Higgs portal in type II seesaw framework
Das, Nandini; Jha, Tapoja; Nanda, Dibyendu (2024-06-20)
American physical society
20.06.2024
Das, N., Jha, T., & Nanda, D. (2024). Vector dark matter with Higgs portal in type II seesaw framework. Physical Review D, 109(11), 115020. https://doi.org/10.1103/PhysRevD.109.115020
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
https://creativecommons.org/licenses/by/4.0/
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202407045122
https://urn.fi/URN:NBN:fi:oulu-202407045122
Tiivistelmä
Abstract
We study the phenomenology of a vector dark matter (VDM) in a \(U(1)_{X}\) gauged extension of the Standard Model (SM), which is set in a type II seesaw framework. When this \(U(1)_{X}\) symmetry is spontaneously broken by the vacuum expectation value (VEV) of a newly introduced complex scalar singlet, the gauge boson \(Z'\) becomes massive. The stability of the dark matter (DM) is ensured by the presence of an exact charge conjugation symmetry resulting from the structure of the Lagrangian. On the other hand, the \(SU(2)_{L}\) triplet scalar facilitates light neutrino masses via the type II seesaw mechanism. We have studied the phenomenology of the usual WIMP DM, considering all possible theoretical and experimental constraints that are applicable. Due to the presence of a triplet scalar, the present framework can also accommodate the observed \(2\sigma\) deviation in \(h\rightarrow Z\gamma\) decay rate, recently measured at the LHC. The possibility of nonthermal production of DM from the decay of the singlet scalar has also been briefly discussed.
We study the phenomenology of a vector dark matter (VDM) in a \(U(1)_{X}\) gauged extension of the Standard Model (SM), which is set in a type II seesaw framework. When this \(U(1)_{X}\) symmetry is spontaneously broken by the vacuum expectation value (VEV) of a newly introduced complex scalar singlet, the gauge boson \(Z'\) becomes massive. The stability of the dark matter (DM) is ensured by the presence of an exact charge conjugation symmetry resulting from the structure of the Lagrangian. On the other hand, the \(SU(2)_{L}\) triplet scalar facilitates light neutrino masses via the type II seesaw mechanism. We have studied the phenomenology of the usual WIMP DM, considering all possible theoretical and experimental constraints that are applicable. Due to the presence of a triplet scalar, the present framework can also accommodate the observed \(2\sigma\) deviation in \(h\rightarrow Z\gamma\) decay rate, recently measured at the LHC. The possibility of nonthermal production of DM from the decay of the singlet scalar has also been briefly discussed.
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