Effective field theory and inelastic dark matter results from XENON1T

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 <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>1</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi mathvariant="normal">t</a:mi><a:mo>×</a:mo><a:mi>yr</a:mi></a:mrow></a:math> exposure. For these analyses, we extended the region of interest from <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"><d:mrow><d:mo stretchy="false">[</d:mo><d:mn>4.9</d:mn><d:mo>,</d:mo><d:mn>40.9</d:mn><d:mo stretchy="false">]</d:mo><d:mtext> </d:mtext><d:mtext> </d:mtext><d:msub><d:mrow><d:mi>keV</d:mi></d:mrow><d:mrow><d:mi>NR</d:mi></d:mrow></d:msub></d:mrow></d:math> to <h:math xmlns:h="http://www.w3.org/1998/Math/MathML" display="inline"><h:mrow><h:mo stretchy="false">[</h:mo><h:mn>4.9</h:mn><h:mo>,</h:mo><h:mn>54.4</h:mn><h:mo stretchy="false">]</h:mo><h:mtext> </h:mtext><h:mtext> </h:mtext><h:msub><h:mrow><h:mi>keV</h:mi></h:mrow><h:mrow><h:mi>NR</h:mi></h:mrow></h:msub></h:mrow></h:math> to enhance our sensitivity for signals that peak at nonzero energies. We show that the data are consistent with the background-only hypothesis, with a small background overfluctuation observed peaking between 20 and <l:math xmlns:l="http://www.w3.org/1998/Math/MathML" display="inline"><l:mrow><l:mn>50</l:mn><l:mtext> </l:mtext><l:mtext> </l:mtext><l:msub><l:mrow><l:mi>keV</l:mi></l:mrow><l:mrow><l:mi>NR</l:mi></l:mrow></l:msub></l:mrow></l:math>, resulting in a maximum local discovery significance of <n:math xmlns:n="http://www.w3.org/1998/Math/MathML" display="inline"><n:mrow><n:mn>1.7</n:mn><n:mi>σ</n:mi></n:mrow></n:math> for the <p:math xmlns:p="http://www.w3.org/1998/Math/MathML" display="inline"><p:mrow><p:mi>Vector</p:mi><p:mo stretchy="false">⊗</p:mo><p:msub><p:mrow><p:mtext>Vector</p:mtext></p:mrow><p:mrow><p:mtext>strange</p:mtext></p:mrow></p:msub></p:mrow></p:math> ChEFT channel for a dark matter particle of <s:math xmlns:s="http://www.w3.org/1998/Math/MathML" display="inline"><s:mrow><s:mn>70</s:mn><s:mtext> </s:mtext><s:mtext> </s:mtext><s:mi>GeV</s:mi><s:mo>/</s:mo><s:msup><s:mrow><s:mi>c</s:mi></s:mrow><s:mrow><s:mn>2</s:mn></s:mrow></s:msup></s:mrow></s:math> and <u:math xmlns:u="http://www.w3.org/1998/Math/MathML" display="inline"><u:mn>1.8</u:mn><u:mi>σ</u:mi></u:math> for an iDM particle of <w:math xmlns:w="http://www.w3.org/1998/Math/MathML" display="inline"><w:mrow><w:mn>50</w:mn><w:mtext> </w:mtext><w:mtext> </w:mtext><w:mi>GeV</w:mi><w:mo>/</w:mo><w:msup><w:mrow><w:mi>c</w:mi></w:mrow><w:mrow><w:mn>2</w:mn></w:mrow></w:msup></w:mrow></w:math> with a mass splitting of <y:math xmlns:y="http://www.w3.org/1998/Math/MathML" display="inline"><y:mrow><y:mn>100</y:mn><y:mtext> </y:mtext><y:mtext> </y:mtext><y:mi>keV</y:mi><y:mo>/</y:mo><y:msup><y:mrow><y:mi>c</y:mi></y:mrow><y:mrow><y:mn>2</y:mn></y:mrow></y:msup></y:mrow></y:math>. For each model, we report 90% confidence level 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. Published by the American Physical Society 2024