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Title: Study of dark matter and QCD-charged mediators in the quasidegenerate regime

Abstract

We examine a scenario in which the only light new particles are a Majorana fermion dark matter candidate and one or more QCD-charged scalars, which couple to light quarks. This scenario has several interesting phenomenological features if the new particles are nearly degenerate in mass. Specifically, LHC searches for the light scalars have reduced sensitivity, since the visible and invisible products tend to be softer. Moreover, dark matter-scalar coannihilation can allow even relatively heavy dark matter candidates to be consistent thermal relics. Lastly, the dark matter nucleon scattering cross section is enhanced in the quasidegenerate limit, allowing direct detection experiments to use both spin-independent and spin-dependent scattering to probe regions of parameter space beyond those probed by the LHC. Although this scenario has a broad application, we phrase this study in terms of the minimal supersymmetric standard model, in the limit where the only light sparticles are a binolike dark matter candidate and light-flavored squarks.

Authors:
 [1];  [2];  [3];  [4];  [5]
+ Show Author Affiliations
  1. Univ. of North Florida, Jacksonville, FL (United States); Univ. of Utah, Salt Lake City, UT (United States)
  2. Univ. of North Florida, Jacksonville, FL (United States)
  3. Univ. of Hawaii, Honolulu, HI (United States)
  4. Univ. of Utah, Salt Lake City, UT (United States)
  5. Univ. of Hawaii, Honolulu, HI (United States); Univ. of Michigan, Ann Arbor, MI (United States)
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States); Univ. of Hawaii, Honolulu, HI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1511834
Alternate Identifier(s):
OSTI ID: 1414980
Grant/Contract Number:  
SC0007859; SC0010504
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 96; Journal Issue: 11; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Davidson, Andrew, Kelso, Chris, Kumar, Jason, Sandick, Pearl, and Stengel, Patrick. Study of dark matter and QCD-charged mediators in the quasidegenerate regime. United States: N. p., 2017. Web. doi:10.1103/physrevd.96.115029.
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Davidson, Andrew, Kelso, Chris, Kumar, Jason, Sandick, Pearl, & Stengel, Patrick. Study of dark matter and QCD-charged mediators in the quasidegenerate regime. United States. https://doi.org/10.1103/physrevd.96.115029
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Davidson, Andrew, Kelso, Chris, Kumar, Jason, Sandick, Pearl, and Stengel, Patrick. Fri . "Study of dark matter and QCD-charged mediators in the quasidegenerate regime". United States. https://doi.org/10.1103/physrevd.96.115029. https://www.osti.gov/servlets/purl/1511834.
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@article{osti_1511834,
title = {Study of dark matter and QCD-charged mediators in the quasidegenerate regime},
author = {Davidson, Andrew and Kelso, Chris and Kumar, Jason and Sandick, Pearl and Stengel, Patrick},
abstractNote = {We examine a scenario in which the only light new particles are a Majorana fermion dark matter candidate and one or more QCD-charged scalars, which couple to light quarks. This scenario has several interesting phenomenological features if the new particles are nearly degenerate in mass. Specifically, LHC searches for the light scalars have reduced sensitivity, since the visible and invisible products tend to be softer. Moreover, dark matter-scalar coannihilation can allow even relatively heavy dark matter candidates to be consistent thermal relics. Lastly, the dark matter nucleon scattering cross section is enhanced in the quasidegenerate limit, allowing direct detection experiments to use both spin-independent and spin-dependent scattering to probe regions of parameter space beyond those probed by the LHC. Although this scenario has a broad application, we phrase this study in terms of the minimal supersymmetric standard model, in the limit where the only light sparticles are a binolike dark matter candidate and light-flavored squarks.},
doi = {10.1103/physrevd.96.115029},
journal = {Physical Review D},
number = 11,
volume = 96,
place = {United States},
year = {Fri Dec 01 00:00:00 EST 2017},
month = {Fri Dec 01 00:00:00 EST 2017}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1103/physrevd.96.115029
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Cited by: 3 works
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Figures / Tables:

FIG. 1 FIG. 1: Event rate at a xenon-based detector (assuming the recoil energy range of XENON1T) as a function of $α$ for operators $\mathcal{O}_1$ (dotted red), $\mathcal{O}_2$ (long-dashed blue) and $\mathcal{O}_{3,7}$ (solid black) for a fixed choice of $m_χ$ = 900 GeV. Shown are Benchmark A (upper left panel), Benchmark Bmore » (upper right panel), Benchmark D (lower left panel) and Benchmark E (lower right panel). All other squarks have a negligible effect. The short-dashed and dash-dotted green lines indicate the current 90% CL sensitivity of XENON1T and the estimated 90% CL sensitivity of LZ, respectively. For Benchmarks A, B and E, operator $\mathcal{O}_7$ begins to dominate the SI scattering rate for $α$ ≲ 10−4−5, where the solid black line is flat.« less
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