Luminous signals of inelastic dark matter in large detectors

Eby, Joshua; Fox, Patrick J.; Harnik, Roni; Kribs, Graham D.

doi:10.1007/JHEP09(2019)115

Title: Luminous signals of inelastic dark matter in large detectors

Journal Article · Mon Sep 16 00:00:00 EDT 2019 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP09(2019)115· OSTI ID:1545092

Eby, Joshua ^[1]; Fox, Patrick J. ^[2]; Harnik, Roni ^[2]; Kribs, Graham D. ^[3]

Weizmann Inst. of Science, Rehovot (Israel). Dept. of Particle Physics and Astrophysics
Fermilab, Batavia, IL (United States). Theoretical Physics Dept.
Univ. of Oregon, Eugene, OR (United States). Dept. of Physics

We study luminous dark matter signals in models with inelastic scattering. Dark matter χ 1 that scatters inelastically off elements in the Earth is kicked into an excited state χ 2 that can subsequently decay into a monoenergetic photon inside a detector. The photon signal exhibits large sidereal-daily modulation due to the daily rotation of the Earth and anisotropies in the problem: the dark matter wind comes from the direction of Cygnus due to the Sun's motion relative to the galaxy, and the rock overburden is anisotropic, as is the dark matter scattering angle. This allows outstanding separation of signal from backgrounds. We investigate the sensitivity of two classes of large underground detectors to this modulating photon line signal: large liquid scintillator neutrino experiments, including Borexino and JUNO, and the proposed large gaseous scintillator directional detection experiment CYGNUS. Borexino's (JUNO's) sensitivity exceeds the bounds from xenon experiments on inelastic nuclear recoil for mass splittings $$$$ \delta \underset{\sim }{>} $$$$ δ > ˜ 240 (180) keV, and is the only probe of inelastic dark matter for 350 keV $$$$ \underset{\sim }{<}\delta \underset{\sim }{<} $$$$ < ˜ δ < ˜ 600 keV. CYGNUS's sensitivity is at least comparable to xenon experiments with ~ 10m3 volume detector for $$$$ \delta \underset{\sim }{<} $$$$ δ < ˜ 150 keV, and could be substantially better with larger volumes and improved background rejection. Such improvements lead to the unusual situation that the inelastic signal becomes the superior way to search for dark matter even if the elastic and inelastic scattering cross sections are comparable.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Univ. of Oregon, Eugene, OR (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359; SC0011640

OSTI ID:: 1545092

Alternate ID(s):: OSTI ID: 1601469; OSTI ID: 1905953

Report Number(s):: arXiv:1904.09994; FERMILAB-PUB-19-147-T; oai:inspirehep.net:1730850

Journal Information:: Journal of High Energy Physics (Online), Vol. 2019, Issue 9; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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