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Title: New mechanism for matter-antimatter asymmetry and connection with dark matter

Abstract

We propose a new mechanism for generating matter-antimatter asymmetry via the interference of tree-level diagrams only, where the imaginary part of the Breit-Wigner propagator for an unstable mediator plays a crucial role. We first derive a general result that a nonzero CP-asymmetry can be generated via at least two sets of interfering tree-level diagrams involving either 2 → 2 or 1 → n (with n ≥ 3 ) processes. We illustrate this point in a simple TeV-scale extension of the Standard Model with an inert Higgs doublet and right-handed neutrinos, along with an electroweak-triplet scalar field, where small Majorana neutrino masses are generated via a combination of radiative type-I and tree-level type-II seesaw mechanisms. The imaginary part needed for the required CP-asymmetry comes from the trilinear coupling of the inert doublet with the triplet scalar, along with the width of the triplet scalar mediator. The real part of the neutral component of the inert doublet serves as a cold dark matter candidate. The evolutions of the dark matter relic density and the baryon asymmetry are intimately related in this scenario.

Authors:
ORCiD logo; ORCiD logo; ; ORCiD logo
Publication Date:
Research Org.:
Washington Univ., St. Louis, MO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); National Research Foundation of Korea (NRF)
OSTI Identifier:
1660331
Alternate Identifier(s):
OSTI ID: 1713192
Grant/Contract Number:  
SC0017987; AC02-07CH11359; 2017K1A3A7A09016430; 2017R1A2B4006338
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 102 Journal Issue: 5; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; baryogenesis & leptogenesis; extensions of Higgs sector; Majorana neutrinos; CP violation

Citation Formats

Dasgupta, Arnab, Dev, P. S. Bhupal, Kang, Sin Kyu, and Zhang, Yongchao. New mechanism for matter-antimatter asymmetry and connection with dark matter. United States: N. p., 2020. Web. https://doi.org/10.1103/physrevd.102.055009.
Dasgupta, Arnab, Dev, P. S. Bhupal, Kang, Sin Kyu, & Zhang, Yongchao. New mechanism for matter-antimatter asymmetry and connection with dark matter. United States. https://doi.org/10.1103/physrevd.102.055009
Dasgupta, Arnab, Dev, P. S. Bhupal, Kang, Sin Kyu, and Zhang, Yongchao. Mon . "New mechanism for matter-antimatter asymmetry and connection with dark matter". United States. https://doi.org/10.1103/physrevd.102.055009.
@article{osti_1660331,
title = {New mechanism for matter-antimatter asymmetry and connection with dark matter},
author = {Dasgupta, Arnab and Dev, P. S. Bhupal and Kang, Sin Kyu and Zhang, Yongchao},
abstractNote = {We propose a new mechanism for generating matter-antimatter asymmetry via the interference of tree-level diagrams only, where the imaginary part of the Breit-Wigner propagator for an unstable mediator plays a crucial role. We first derive a general result that a nonzero CP-asymmetry can be generated via at least two sets of interfering tree-level diagrams involving either 2 → 2 or 1 → n (with n ≥ 3 ) processes. We illustrate this point in a simple TeV-scale extension of the Standard Model with an inert Higgs doublet and right-handed neutrinos, along with an electroweak-triplet scalar field, where small Majorana neutrino masses are generated via a combination of radiative type-I and tree-level type-II seesaw mechanisms. The imaginary part needed for the required CP-asymmetry comes from the trilinear coupling of the inert doublet with the triplet scalar, along with the width of the triplet scalar mediator. The real part of the neutral component of the inert doublet serves as a cold dark matter candidate. The evolutions of the dark matter relic density and the baryon asymmetry are intimately related in this scenario.},
doi = {10.1103/physrevd.102.055009},
journal = {Physical Review D},
number = 5,
volume = 102,
place = {United States},
year = {2020},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/physrevd.102.055009

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