Search for Inelastic Dark Matter in Events with Two Displaced Muons and Missing Transverse Momentum in Proton-Proton Collisions at <math display="inline"><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math>

Benecke, Anna;Bruno, Giacomo;Caputo, Claudio;Delaere, Christophe;Bethani, Agni;et.al.
(2024) Physical Review Letters — Vol. 132 (2024)

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Abstract
A search for dark matter in events with a displaced nonresonant muon pair and missing transverse momentum is presented. The analysis is performed using an integrated luminosity of <math display="inline"><mrow><mn>138</mn><mtext> </mtext><mtext> </mtext><msup><mrow><mi>fb</mi></mrow><mrow><mo>-</mo><mn>1</mn></mrow></msup></mrow></math> of proton-proton (<math display="inline"><mi>p</mi><mi>p</mi></math>) collision data at a center-of-mass energy of 13 TeV produced by the LHC in 2016–2018. No significant excess over the predicted backgrounds is observed. Upper limits are set on the product of the inelastic dark matter production cross section <math display="inline"><mrow><mi>σ</mi><mo stretchy="false">(</mo><mi>p</mi><mi>p</mi><mo stretchy="false">→</mo><msup><mrow><mi>A</mi></mrow><mrow><mo>′</mo></mrow></msup><mo stretchy="false">→</mo><msub><mrow><mi>χ</mi></mrow><mrow><mn>1</mn></mrow></msub><msub><mrow><mi>χ</mi></mrow><mrow><mn>2</mn></mrow></msub><mo stretchy="false">)</mo></mrow></math> and the decay branching fraction <math display="inline"><mrow><mi mathvariant="script">B</mi><mo stretchy="false">(</mo><msub><mrow><mi>χ</mi></mrow><mrow><mn>2</mn></mrow></msub><mo stretchy="false">→</mo><msub><mrow><mi>χ</mi></mrow><mrow><mn>1</mn></mrow></msub><msup><mrow><mi>μ</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>μ</mi></mrow><mrow><mo>-</mo></mrow></msup><mo stretchy="false">)</mo></mrow></math>, where <math display="inline"><msup><mi>A</mi><mo>′</mo></msup></math> is a dark photon and <math display="inline"><msub><mi>χ</mi><mn>1</mn></msub></math> and <math display="inline"><msub><mi>χ</mi><mn>2</mn></msub></math> are states in the dark sector with near mass degeneracy. This is the first dedicated collider search for inelastic dark matter.
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Benecke, A., Bruno, G., Caputo, C., Delaere, C., Donertas, I. S., Giammanco, A., Jaffel, K., Jain, S., Jain, S., Lemaitre, V., Lidrych, J., Mastrapasqua, P., Mondal, K., Tran, T. T., Wertz, S., CMS, Bethani, A., & et al. (2024). Search for Inelastic Dark Matter in Events with Two Displaced Muons and Missing Transverse Momentum in Proton-Proton Collisions at <math display=“inline”><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math>. Physical Review Letters, 132. https://doi.org/10.1103/PhysRevLett.132.041802 (Original work published 2024)