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Title: Thermal dark matter through the Dirac neutrino portal

Abstract

We study a simple model of thermal dark matter annihilating to standard model neutrinos via the neutrino portal. A (pseudo-)Dirac sterile neutrino serves as a mediator between the visible and the dark sectors, while an approximate lepton number symmetry allows for a large neutrino Yukawa coupling and, in turn, efficient dark matter annihilation. The dark sector consists of two particles, a Dirac fermion and complex scalar, charged under a symmetry that ensures the stability of the dark matter. A generic prediction of the model is a sterile neutrino with a large active-sterile mixing angle that decays primarily invisibly. We derive existing constraints and future projections from direct detection experiments, colliders, rare meson and tau decays, electroweak precision tests, and small scale structure observations. Along with these phenomenological tests, we investigate the consequences of perturbativity and scalar mass fine tuning on the model parameter space. A simple, conservative scheme to confront the various tests with the thermal relic target is outlined, and we demonstrate that much of the cosmologically-motivated parameter space is already constrained. We also identify new probes of this scenario such as multibody kaon decays and Drell-Yan production of W bosons at the LHC.

Authors:
; ; ;
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States); Univ. of Pittsburgh, PA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1433034
Alternate Identifier(s):
OSTI ID: 1498911
Grant/Contract Number:  
SC0015634; FG02-95ER40896
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 97 Journal Issue: 7; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Batell, Brian, Han, Tao, McKeen, David, and Haghi, Barmak Shams Es. Thermal dark matter through the Dirac neutrino portal. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.97.075016.
Batell, Brian, Han, Tao, McKeen, David, & Haghi, Barmak Shams Es. Thermal dark matter through the Dirac neutrino portal. United States. doi:10.1103/PhysRevD.97.075016.
Batell, Brian, Han, Tao, McKeen, David, and Haghi, Barmak Shams Es. Fri . "Thermal dark matter through the Dirac neutrino portal". United States. doi:10.1103/PhysRevD.97.075016.
@article{osti_1433034,
title = {Thermal dark matter through the Dirac neutrino portal},
author = {Batell, Brian and Han, Tao and McKeen, David and Haghi, Barmak Shams Es},
abstractNote = {We study a simple model of thermal dark matter annihilating to standard model neutrinos via the neutrino portal. A (pseudo-)Dirac sterile neutrino serves as a mediator between the visible and the dark sectors, while an approximate lepton number symmetry allows for a large neutrino Yukawa coupling and, in turn, efficient dark matter annihilation. The dark sector consists of two particles, a Dirac fermion and complex scalar, charged under a symmetry that ensures the stability of the dark matter. A generic prediction of the model is a sterile neutrino with a large active-sterile mixing angle that decays primarily invisibly. We derive existing constraints and future projections from direct detection experiments, colliders, rare meson and tau decays, electroweak precision tests, and small scale structure observations. Along with these phenomenological tests, we investigate the consequences of perturbativity and scalar mass fine tuning on the model parameter space. A simple, conservative scheme to confront the various tests with the thermal relic target is outlined, and we demonstrate that much of the cosmologically-motivated parameter space is already constrained. We also identify new probes of this scenario such as multibody kaon decays and Drell-Yan production of W bosons at the LHC.},
doi = {10.1103/PhysRevD.97.075016},
journal = {Physical Review D},
number = 7,
volume = 97,
place = {United States},
year = {2018},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.97.075016

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Cited by: 8 works
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    Works referencing / citing this record:

    Dark matter from freeze-in via the neutrino portal
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    Dark matter from freeze-in via the neutrino portal
    journal, July 2019