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Title: Testing light dark matter coannihilation with fixed-target experiments

Abstract

In this paper, we introduce a novel program of fixed-target searches for thermal-origin Dark Matter (DM), which couples inelastically to the Standard Model. Since the DM only interacts by transitioning to a heavier state, freeze-out proceeds via coannihilation and the unstable heavier state is depleted at later times. For sufficiently large mass splittings, direct detection is kinematically forbidden and indirect detection is impossible, so this scenario can only be tested with accelerators. Here we propose new searches at proton and electron beam fixed-target experiments to probe sub-GeV coannihilation, exploiting the distinctive signals of up- and downscattering as well as decay of the excited state inside the detector volume. Furthermore, we focus on a representative model in which DM is a pseudo-Dirac fermion coupled to a hidden gauge field (dark photon), which kinetically mixes with the visible photon. We define theoretical targets in this framework and determine the existing bounds by reanalyzing results from previous experiments. We find that LSND, E137, and BaBar data already place strong constraints on the parameter space consistent with a thermal freeze-out origin, and that future searches at Belle II and MiniBooNE, as well as recently-proposed fixed-target experiments such as LDMX and BDX, can cover nearlymore » all remaining gaps. We also briefly comment on the discovery potential for proposed beam dump and neutrino experiments which operate at much higher beam energies.« less

Authors:
 [1];  [2];  [3];  [2]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Princeton Univ., Princeton, NJ (United States)
  3. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1426438
Alternate Identifier(s):
OSTI ID: 1354872; OSTI ID: 1380015
Report Number(s):
BNL-114492-2017-JAAM; FERMILAB-PUB-17-068-PPD; PUPT-2520; arXiv:1703.06881
Journal ID: ISSN 2470-0010; PRVDAQ; TRN: US1802280
Grant/Contract Number:  
SC0012704; AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 96; Journal Issue: 5; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Izaguirre, Eder, Kahn, Yonatan, Krnjaic, Gordan, and Moschella, Matthew. Testing light dark matter coannihilation with fixed-target experiments. United States: N. p., 2017. Web. doi:10.1103/PhysRevD.96.055007.
Izaguirre, Eder, Kahn, Yonatan, Krnjaic, Gordan, & Moschella, Matthew. Testing light dark matter coannihilation with fixed-target experiments. United States. doi:10.1103/PhysRevD.96.055007.
Izaguirre, Eder, Kahn, Yonatan, Krnjaic, Gordan, and Moschella, Matthew. Thu . "Testing light dark matter coannihilation with fixed-target experiments". United States. doi:10.1103/PhysRevD.96.055007. https://www.osti.gov/servlets/purl/1426438.
@article{osti_1426438,
title = {Testing light dark matter coannihilation with fixed-target experiments},
author = {Izaguirre, Eder and Kahn, Yonatan and Krnjaic, Gordan and Moschella, Matthew},
abstractNote = {In this paper, we introduce a novel program of fixed-target searches for thermal-origin Dark Matter (DM), which couples inelastically to the Standard Model. Since the DM only interacts by transitioning to a heavier state, freeze-out proceeds via coannihilation and the unstable heavier state is depleted at later times. For sufficiently large mass splittings, direct detection is kinematically forbidden and indirect detection is impossible, so this scenario can only be tested with accelerators. Here we propose new searches at proton and electron beam fixed-target experiments to probe sub-GeV coannihilation, exploiting the distinctive signals of up- and downscattering as well as decay of the excited state inside the detector volume. Furthermore, we focus on a representative model in which DM is a pseudo-Dirac fermion coupled to a hidden gauge field (dark photon), which kinetically mixes with the visible photon. We define theoretical targets in this framework and determine the existing bounds by reanalyzing results from previous experiments. We find that LSND, E137, and BaBar data already place strong constraints on the parameter space consistent with a thermal freeze-out origin, and that future searches at Belle II and MiniBooNE, as well as recently-proposed fixed-target experiments such as LDMX and BDX, can cover nearly all remaining gaps. We also briefly comment on the discovery potential for proposed beam dump and neutrino experiments which operate at much higher beam energies.},
doi = {10.1103/PhysRevD.96.055007},
journal = {Physical Review D},
number = 5,
volume = 96,
place = {United States},
year = {2017},
month = {9}
}

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