Large scalar multiplet dark matter in the high-mass region

Large scalar multiplet dark matter in the high-mass region We study two models of scalar dark matter from “large” electroweak multiplets with isospin 5/2 (n=6 members) and 7/2 (n=8), whose scalar potentials preserve a Z2 symmetry. Because of large annihilation cross sections due to electroweak interactions, these scalars can constitute all the dark matter only for masses in the multi-TeV range. For such high masses, Sommerfeld enhancement and coannihilations play important roles in the dark matter relic abundance calculation, reducing the upper bound on the large multiplet’s mass by almost a factor of 2. We determine the allowed parameter ranges including both of these effects and show that these models are as yet unconstrained by dark matter direct detection experiments, but will be probed by currently running and proposed future experiments. We also show that a Landau pole appears in these models at energy scales below 109  GeV, indicating the presence of additional new physics below that scale. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

Large scalar multiplet dark matter in the high-mass region

Preview Only

Large scalar multiplet dark matter in the high-mass region

Abstract

We study two models of scalar dark matter from “large” electroweak multiplets with isospin 5/2 (n=6 members) and 7/2 (n=8), whose scalar potentials preserve a Z2 symmetry. Because of large annihilation cross sections due to electroweak interactions, these scalars can constitute all the dark matter only for masses in the multi-TeV range. For such high masses, Sommerfeld enhancement and coannihilations play important roles in the dark matter relic abundance calculation, reducing the upper bound on the large multiplet’s mass by almost a factor of 2. We determine the allowed parameter ranges including both of these effects and show that these models are as yet unconstrained by dark matter direct detection experiments, but will be probed by currently running and proposed future experiments. We also show that a Landau pole appears in these models at energy scales below 109  GeV, indicating the presence of additional new physics below that scale.
Loading next page...
 
/lp/aps_physical/large-scalar-multiplet-dark-matter-in-the-high-mass-region-4Vu4wXTvSA
Publisher
American Physical Society (APS)
Copyright
Copyright © © 2017 American Physical Society
ISSN
1550-7998
eISSN
1550-2368
D.O.I.
10.1103/PhysRevD.96.015030
Publisher site
See Article on Publisher Site

Abstract

We study two models of scalar dark matter from “large” electroweak multiplets with isospin 5/2 (n=6 members) and 7/2 (n=8), whose scalar potentials preserve a Z2 symmetry. Because of large annihilation cross sections due to electroweak interactions, these scalars can constitute all the dark matter only for masses in the multi-TeV range. For such high masses, Sommerfeld enhancement and coannihilations play important roles in the dark matter relic abundance calculation, reducing the upper bound on the large multiplet’s mass by almost a factor of 2. We determine the allowed parameter ranges including both of these effects and show that these models are as yet unconstrained by dark matter direct detection experiments, but will be probed by currently running and proposed future experiments. We also show that a Landau pole appears in these models at energy scales below 109  GeV, indicating the presence of additional new physics below that scale.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Jul 1, 2017

There are no references for this article.

Sorry, we don’t have permission to share this article on DeepDyve,
but here are related articles that you can start reading right now:

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off