Search for New Physics in Events with Two Soft Oppositely Charged Leptons and Missing Transverse Momentum in Proton–proton Collisions at √s = 13 TeV
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Author(s)
CMS Collaboration
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Azzolini, Virginia
Barbieri, Richard Alexander
Baty, Austin Alan
Bauer, Gerry P
Bi, Ran
Brandt, Stephanie Akemi
Busza, Wit
Date Issued
May 2018
Journal
Physics Letters B
Publisher
Elsevier
Citation
Sirunyan, A.M. et al. “Search for New Physics in Events with Two Soft Oppositely Charged Leptons and Missing Transverse Momentum in Proton–proton Collisions at √s = 13 TeV.” Physics Letters B 782 (July 2018): 440–467 © 2018 The Author(s)
Version
Final published version
Abstract
A search is presented for new physics in events with two low-momentum, oppositely charged leptons (electrons or muons) and missing transverse momentum in proton-proton collisions at a centre-of-mass energy of 13 TeV. The data collected using the CMS detector at the LHC correspond to an integrated luminosity of 35.9fb⁻¹. The observed event yields are consistent with the expectations from the standard model. The results are interpreted in terms of pair production of charginos and neutralinos (χ˜₁±and χ˜₂⁰) with nearly degenerate masses, as expected in natural supersymmetry models with light higgsinos, as well as in terms of the pair production of top squarks (t˜), when the lightest neutralino and the top squark have similar masses. At 95% confidence level, wino-like χ˜₁±/χ˜₂⁰ masses are excluded up to 230 GeV for a mass difference of 20 GeV relative to the lightest neutralino. In the higgsino-like model, masses are excluded up to 168 GeV for the same mass difference. For t˜ pair production, top squark masses up to 450 GeV are excluded for a mass difference of 40 GeV relative to the lightest neutralino. Keywords: CMS; SUSY; Compressed; Leptons; Missing energy
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1016/j.physletb.2018.05.062
