Search for direct pair production of supersymmetric partners of $\tau$ leptons in the final state with two hadronically decaying $\tau$ leptons and missing transverse momentum in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Benecke, Anna;Bethani, Agni;Bruno, Giacomo;Bury, Florian;CMS;et.al.
(2023) Physical review D — Vol. 108 (2023)

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Authors
  • Benecke, AnnaUCLouvain
    Author
  • Bethani, Agniorcid-logoUCLouvain
    Author
  • Bruno, GiacomoUCLouvain
    Author
  • Bury, FlorianUCLouvain
    Author
  • Caputo, ClaudioUCLouvain
    Author
  • David, PieterUCLouvain
    Author
  • Delaere, Christopheorcid-logoUCLouvain
    Author
  • Donertas, Izzeddin SuatUCLouvain
    Author
  • Giammanco, AndreaUCLouvain
    Author
  • Jaffel, KhawlaUCLouvain
    Author
  • Jain, SandhyaUCLouvain
    Author
  • Jain, SandhyaUCLouvain
    Author
  • Lemaitre, VincentUCLouvain
    Author
  • Mondal, KuntalUCLouvain
    Author
  • Prisciandaro, JessicaUCLouvain
    Author
  • Taliercio, AngelaUCLouvain
    Author
  • Teklishyn, MaksymUCLouvain
    Author
  • Tran, Tu ThongUCLouvain
    Author
  • Vischia, PietroUCLouvain
    Author
  • Wertz, SébastienUCLouvain
    Author
  • CMS
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  • et. al.
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Abstract
A search for the direct production of a pair of <math display="inline"><mi>τ</mi></math> sleptons, the supersymmetric partners of <math display="inline"><mi>τ</mi></math> leptons, is presented. Each <math display="inline"><mi>τ</mi></math> slepton is assumed to decay to a <math display="inline"><mi>τ</mi></math> lepton and the lightest supersymmetric particle (LSP), which is assumed to be stable and to not interact in the detector, leading to an imbalance in the total reconstructed transverse momentum. The search is carried out in events identified as containing two <math display="inline"><mi>τ</mi></math> leptons, each decaying to one or more hadrons and a neutrino, and significant transverse momentum imbalance. In addition to scenarios in which the <math display="inline"><mi>τ</mi></math> sleptons decay promptly, the search also addresses scenarios in which the <math display="inline"><mi>τ</mi></math> sleptons have sufficiently long lifetimes to give rise to nonprompt <math display="inline"><mi>τ</mi></math> leptons. The data were collected in proton-proton collisions at a center-of-mass energy of <math display="inline"><mrow><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></mrow></math> at the CERN LHC with the CMS detector in 2016–2018, and correspond to an integrated luminosity of <math display="inline"><mn>138</mn><mtext> </mtext><mtext> </mtext><msup><mi>fb</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. No significant excess is seen with respect to standard model expectations. Upper limits on cross sections for the pair production of <math display="inline"><mi>τ</mi></math> sleptons are obtained in the framework of simplified models. In a scenario in which the <math display="inline"><mi>τ</mi></math> sleptons are superpartners of left-handed <math display="inline"><mi>τ</mi></math> leptons, and each undergoes a prompt decay to a <math display="inline"><mi>τ</mi></math> lepton and a nearly massless LSP, <math display="inline"><mi>τ</mi></math> slepton masses between 115 and 340 GeV are excluded. In a scenario in which the lifetime of the <math display="inline"><mi>τ</mi></math> sleptons corresponds to <math display="inline"><mrow><mi>c</mi><msub><mi>τ</mi><mn>0</mn></msub></mrow><mo>=</mo><mn>0.1</mn><mtext> </mtext><mtext> </mtext><mi>mm</mi></math>, where <math display="inline"><msub><mi>τ</mi><mn>0</mn></msub></math> represents the mean proper lifetime of the <math display="inline"><mi>τ</mi></math> slepton, masses between 150 and 220 GeV are excluded.
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Benecke, A., Bethani, A., Bruno, G., Bury, F., Caputo, C., David, P., Delaere, C., Donertas, I. S., Giammanco, A., Jaffel, K., Jain, S., Jain, S., Lemaitre, V., Mondal, K., Prisciandaro, J., Taliercio, A., Teklishyn, M., Tran, T. T., Vischia, P., et al. (2023). Search for direct pair production of supersymmetric partners of $\tau$ leptons in the final state with two hadronically decaying $\tau$ leptons and missing transverse momentum in proton-proton collisions at $\sqrt{s}$ = 13 TeV. Physical review D, 108. https://doi.org/10.1103/PhysRevD.108.012011 (Original work published 2023)