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˜) in supersymmetric models that exhibit coannihilation between the τ˜ and the lightest neutralino ( χ˜ 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 ffiffi s p ¼ 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˜ 1 ) or next-to-lightest neutralino ( χ˜ 0 2), and the χ˜ 0 1. The mass of the τ˜ is assumed to be the average of the ˜χ 1 and χ˜ 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 χ˜ 1 , χ˜ 0 2, and τ˜ production cross sections for Δmð χ˜ 1 ; χ˜ 0 1Þ ¼ 50 GeV, resulting in a lower limit of 290 GeV on the mass of the ˜χ 1 , which is the most stringent to date and surpasses the bounds from the LEP experiments

Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Brandstetter, J., 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(4) [10.1103/PhysRevLett.124.041803].

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

Benaglia, A.;Beschi, A.;Brivio, F.;Ciriolo, V.;Dinardo, M.  E.;Ghezzi, A.;Govoni, P.;Guzzi, L.;Malberti, M.;Monti, F.;Moroni, L.;Paganoni, M.;Ragazzi, S.;Tabarelli de Fatis, T.;Zuolo, D.;Massironi, A.;Gerosa, R.;Lucchini, M.  T.;De Guio, F.;
2020

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˜) in supersymmetric models that exhibit coannihilation between the τ˜ and the lightest neutralino ( χ˜ 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 ffiffi s p ¼ 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˜ 1 ) or next-to-lightest neutralino ( χ˜ 0 2), and the χ˜ 0 1. The mass of the τ˜ is assumed to be the average of the ˜χ 1 and χ˜ 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 χ˜ 1 , χ˜ 0 2, and τ˜ production cross sections for Δmð χ˜ 1 ; χ˜ 0 1Þ ¼ 50 GeV, resulting in a lower limit of 290 GeV on the mass of the ˜χ 1 , which is the most stringent to date and surpasses the bounds from the LEP experiments
Articolo in rivista - Articolo scientifico
Physics, LHC, CMS, SUSY
English
2020
124
4
041803
open
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Brandstetter, J., 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(4) [10.1103/PhysRevLett.124.041803].
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