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 (˜χ01), 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±1) or next-to-lightest neutralino (˜χ02), and the ˜χ01. The mass of the ˜τ is assumed to be the average of the ˜χ±1 and ˜χ01 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, ˜χ02, and ˜τ production cross sections for Δm(˜χ±1,˜χ01)=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.

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

CANDELISE, V.;DA ROLD, A.;DELLA RICCA, G.;VAZZOLER, F.;
2020-01-01

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 (˜χ01), 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±1) or next-to-lightest neutralino (˜χ02), and the ˜χ01. The mass of the ˜τ is assumed to be the average of the ˜χ±1 and ˜χ01 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, ˜χ02, and ˜τ production cross sections for Δm(˜χ±1,˜χ01)=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.
2020
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https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.124.041803
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2955977
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