Search for supersymmetry with a compressed mass spectrum in events with a soft τ lepton, a highly energetic jet, and large missing transverse momentum in proton-proton collisions at √s=13 TeV
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PhysRevLett.124.041803.pdf
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Author(s)
Abercrombie, Daniel Robert
Allen, B.
Baty, A.
Bi, R.
Brandt, S.
Busza, Wit
Cali, Ivan Amos
D'Alfonso, Mariarosaria
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Date Issued
January 29, 2020
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
CMS Collaboration (Sirunyan, A.M., et al.), "Search for supersymmetry with a compressed mass spectrum in events with a soft τ lepton, a highly energetic jet, and large missing transverse momentum in proton-proton collisions at √s=13 TeV." Physical Review Letters 124 (Jan. 2020): no. 041803 doi 10.1103/PhysRevLett.124.041803 ©2020 Author(s)
Version
Final published version
Abstract
The first search for supersymmetry in events with an experimental signature of one soft, hadronically decaying τ lepton, one energetic jet from initial-state radiation, and large transverse momentum imbalance is presented. These event signatures are consistent with direct or indirect production of scalar τ leptons (τ[tilde above]) in supersymmetric models that exhibit coannihilation between the τ[tilde above] and the lightest neutralino (χ[tilde above][superscript 0 over subscript 1]), and that could generate the observed relic density of dark matter. The data correspond to an integrated luminosity of 77.2 fb-¹ of proton-proton collisions at √s=13 TeV collected with the CMS detector at the LHC in 2016 and 2017. The results are interpreted in a supersymmetric scenario with a small mass difference (Δm) between the chargino (χ[tilde above][superscript ± over subscript 1]) or next-to-lightest neutralino (χ[tilde above][superscript 0 over subscript 2]), and the χ[tilde above][superscript 0 over subscript 1]. The mass of the τ[tilde above] is assumed to be the average of the χ[tilde above][[superscript ±] over subscript 1] and χ[over ˜][superscript 0 over subscript 1] masses. The data are consistent with standard model background predictions. Upper limits at 95% confidence level are set on the sum of the χ[tilde above][superscript ± over subscript 1], χ[tilde above][superscript 0 over subscript 2], and τ[tilde above] production cross sections for Δm(χ[tilde above][superscript ± over subscript 1],χ[tilde above][superscript 0 over subscript 1])=50 GeV, resulting in a lower limit of 290 GeV on the mass of the χ[tilde above][superscript ± over subscript 1], which is the most stringent to date and surpasses the bounds from the LEP experiments.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 3.0 unported license
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.124.041803
