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Dark Matter Signals from Timing Spectra at Neutrino Experiments

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Title
Dark Matter Signals from Timing Spectra at Neutrino Experiments
Author(s)
Bhaskar Dutta; Doojin Kim; Shu Liao; Jong-Chul Park; Seodong Shin; Louis E. Strigari
Publication Date
2020-03
Journal
PHYSICAL REVIEW LETTERS, v.124, no.12, pp.121802
Publisher
AMER PHYSICAL SOC
Abstract
ⓒ American Physical Society. We propose a novel strategy to search for new physics in timing spectra at low-energy neutrino experiments using a pulsed beam, envisioning the situation in which a new particle comes from the decay of its heavier partner with a finite particle width. The timing distribution of events induced by the dark matter (DM) candidate particle scattering at the detector may populate in a relatively narrow range, forming a "resonancelike" shape. Because of this structural feature, the signal may be isolated from the backgrounds, in particular when the backgrounds are uniformly distributed in energy and time. For proof of the principle, we investigate the discovery potential for DM from the decay of a dark photon in the ongoing COHERENT experiment and show the exciting prospects for exploring the associated parameter space with this experiment. We analyze the existing CsI detector data with a timing cut and an energy cut, and we find, for the first time, an excess in the timing distribution that can be explained by such DM. We compare the sensitivity to the kinetic mixing parameter (epsilon) for current and future COHERENT experiments with the projected limits from LDMX and DUNE
URI
https://pr.ibs.re.kr/handle/8788114/8716
DOI
10.1103/PhysRevLett.124.121802
ISSN
0031-9007
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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