Search for supersymmetry with a compressed mass spectrum in events with a soft $\tau$ lepton, a highly energetic jet, and large missing transverse momentum in proton-proton collisions at $\sqrt{s}=$ 13 TeV

Bondu, Olivier;Bruno, Giacomo;Caputo, Claudio;David, Pieter;CMS Collaboration;et.al.
(2020) Physical Review Letters — Vol. 124, p. 41803 (2020)

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Authors
  • Bondu, OlivierUCLouvain
    Author
  • Bruno, GiacomoUCLouvain
    Author
  • Caputo, ClaudioUCLouvain
    Author
  • David, PieterUCLouvain
    Author
  • Delaere, Christopheorcid-logoUCLouvain
    Author
  • Delcourt, MartinUCLouvain
    Author
  • Giammanco, Andreaorcid-logoUCLouvain
    Author
  • Lemaitre, VincentUCLouvain
    Author
  • Prisciandaro, JessicaUCLouvain
    Author
  • Saggio, AlessiaUCLouvain
    Author
  • Vidal Marono, MiguelUCLouvain
    Author
  • Vischia, PietroUCLouvain
    Author
  • Zobec, JozeUCLouvain
    Author
  • CMS Collaboration
    Author
  • et. al.
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Abstract
The first search for supersymmetry in events with an experimental signature of one soft, hadronically decaying $\tau$ 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 $\tau$ leptons ($\tilde{\tau}$) in supersymmetric models that exhibit coannihilation between the $\tilde{\tau}$ and the lightest neutralino ($\tilde{\chi}^0_1$), 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 $\sqrt{s}=$ 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 ($\Delta m$) between the chargino ($\tilde{\chi}^\pm_1$) or next-to-lightest neutralino ($\tilde{\chi}^0_2$), and the $\tilde{\chi}^0_1$. The mass of the $\tilde{\tau}$ is assumed to be the average of the $\tilde{\chi}^\pm_1$ and $\tilde{\chi}^0_1$ masses. The data are consistent with standard model background predictions. Upper limits at 95% confidence level are set on the sum of the $\tilde{\chi}^\pm_1$, $\tilde{\chi}^0_2$, and $\tilde{\tau}$ production cross sections for $\Delta m(\tilde{\chi}^\pm_1, \tilde{\chi}^0_1) =$ 50 GeV, resulting in a lower limit of 290 GeV on the mass of the $\tilde{\chi}^\pm_1$, which is the most stringent to date and surpasses the bounds from the LEP experiments.
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Bondu, O., Bruno, G., Caputo, C., David, P., Delaere, C., Delcourt, M., Giammanco, A., Lemaitre, V., Prisciandaro, J., Saggio, A., Vidal Marono, M., Vischia, P., Zobec, J., CMS Collaboration, & et al. (2020). Search for supersymmetry with a compressed mass spectrum in events with a soft $\tau$ lepton, a highly energetic jet, and large missing transverse momentum in proton-proton collisions at $\sqrt{s}=$ 13 TeV. Physical Review Letters, 124, 41803. https://doi.org/10.1103/PhysRevLett.124.041803 (Original work published 2020)