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Free keywords:
High Energy Physics - Experiment, hep-ex,High Energy Physics - Phenomenology, hep-ph
Abstract:
In this work, we expand on the XENON1T nuclear recoil searches to study the
individual signals of dark matter interactions from operators up to
dimension-eight in a Chiral Effective Field Theory (ChEFT) and a model of
inelastic dark matter (iDM). We analyze data from two science runs of the
XENON1T detector totaling 1\,tonne$\times$year exposure. For these analyses, we
extended the region of interest from [4.9, 40.9]$\,$keV$_{\text{NR}}$ to [4.9,
54.4]$\,$keV$_{\text{NR}}$ to enhance our sensitivity for signals that peak at
nonzero energies. We show that the data is consistent with the background-only
hypothesis, with a small background over-fluctuation observed peaking between
20 and 50$\,$keV$_{\text{NR}}$, resulting in a maximum local discovery
significance of 1.7\,$\sigma$ for the Vector$\otimes$Vector$_{\text{strange}}$
($VV_s$) ChEFT channel for a dark matter particle of 70$\,$GeV/c$^2$, and
$1.8\,\sigma$ for an iDM particle of 50$\,$GeV/c$^2$ with a mass splitting of
100$\,$keV/c$^2$. For each model, we report 90\,\% confidence level (CL) upper
limits. We also report upper limits on three benchmark models of dark matter
interaction using ChEFT where we investigate the effect of isospin-breaking
interactions. We observe rate-driven cancellations in regions of the
isospin-breaking couplings, leading to up to 6 orders of magnitude weaker upper
limits with respect to the isospin-conserving case.
