Type II Dirac seesaw with observable ΔNeff in the light of W-mass anomaly

Borah, Debasish and Mahapatra, Satyabrata and Nanda, Dibyendu and Sahu, Narendra (2022) Type II Dirac seesaw with observable ΔNeff in the light of W-mass anomaly. Physics Letters B, 833. pp. 1-8. ISSN 0370-2693

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Abstract

We propose a type II seesaw model for light Dirac neutrinos to provide an explanation for the recently reported anomaly in W boson mass by the CDF collaboration with 7σ statistical significance. In the minimal model, the required enhancement in W boson mass is obtained at tree level due to the vacuum expectation value of a real scalar triplet, which also plays a role in generating light Dirac neutrino mass. Depending upon the couplings and masses of newly introduced particles, we can have thermally or non-thermally generated relativistic degrees of freedom ΔNeff in the form of right handed neutrinos which can be observed at future cosmology experiments. Extending the model to a radiative Dirac seesaw scenario can also accommodate dark matter and lepton anomalous magnetic moment. © 2022 The Authors

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IITH Creators:

IITH Creators	ORCiD
Sahu, Narendra	UNSPECIFIED

Item Type:

Article

Additional Information:

DN would like to thank Sanjoy Mandal for useful discussions. The work of DN is supported by National Research Foundation of Korea (NRF)'s grants, grants no. 2019R1A2C300500913 . SM would like to thank Purusottam Ghosh for useful discussion. NS acknowledges the support from Department of Atomic Energy (DAE)- Board of Research in Nuclear Sciences (BRNS), Government of India (Ref. Number: 58/14/15/2021- BRNS/37220 ).

Uncontrolled Keywords:

light Dirac neutrinos, radiative Dirac seesaw scenario, thermally or non-thermally generated relativistic degrees of freedom ΔNeff .

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

. LibTrainee 2021

Date Deposited:

01 Aug 2022 11:02

Last Modified:

01 Aug 2022 11:02