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Scientific article
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English

Search for direct production of electroweakinos in final states with one lepton, jets and missing transverse momentum in pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector

ContributorsATLAS Colllaboration
Published inThe journal of high energy physics, vol. 2023, 167
Publication date2023
First online date2023-12-27
Abstract

Searches for electroweak production of wino-like chargino pairs, $$ {\overset{\sim }{\chi}}_1^{+}{\overset{\sim }{\chi}}_1^{-} $$ χ ~ 1 + χ ~ 1 − , and of wino-like chargino and next-to-lightest neutralino, $$ {\overset{\sim }{\chi}}_1^{\pm }{\overset{\sim }{\chi}}_2^0 $$ χ ~ 1 ± χ ~ 2 0 , are presented. The models explored assume that the charginos decay into a W boson and the lightest neutralino, $$ {\overset{\sim }{\chi}}_1^{\pm}\to {W}^{\pm }{\overset{\sim }{\chi}}_1^0 $$ χ ~ 1 ± → W ± χ ~ 1 0 . The next-to-lightest neutralinos are degenerate in mass with the chargino and decay to $$ {\overset{\sim }{\chi}}_1^0 $$ χ ~ 1 0 and either a Z or a Higgs boson, $$ {\overset{\sim }{\chi}}_2^0\to Z{\overset{\sim }{\chi}}_1^0 $$ χ ~ 2 0 → Z χ ~ 1 0 or $$ h{\overset{\sim }{\chi}}_1^0 $$ h χ ~ 1 0 . The searches exploit the presence of a single isolated lepton and missing transverse momentum from the W boson decay products and the lightest neutralinos, and the presence of jets from hadronically decaying Z or W bosons or from the Higgs boson decaying into a pair of b -quarks. The searches use 139 fb − 1 of $$ \sqrt{s} $$ s = 13 TeV proton-proton collisions data collected by the ATLAS detector at the Large Hadron Collider between 2015 and 2018. No deviations from the Standard Model expectations are found, and 95% confidence level exclusion limits are set. Chargino masses ranging from 260 to 520 GeV are excluded for a massless $$ {\overset{\sim }{\chi}}_1^0 $$ χ ~ 1 0 in chargino pair production models. Degenerate chargino and next-to-lightest neutralino masses ranging from 260 to 420 GeV are excluded for a massless $$ {\overset{\sim }{\chi}}_1^0 $$ χ ~ 1 0 for $$ {\overset{\sim }{\chi}}_2^0\to Z{\overset{\sim }{\chi}}_1^0 $$ χ ~ 2 0 → Z χ ~ 1 0 . For decays through an on-shell Higgs boson and for mass-splitting between $$ {\overset{\sim }{\chi}}_1^{\pm }/{\overset{\sim }{\chi}}_2^0 $$ χ ~ 1 ± / χ ~ 2 0 and $$ {\overset{\sim }{\chi}}_1^0 $$ χ ~ 1 0 as small as the Higgs boson mass, mass limits are improved by up to 40 GeV in the range of 200–260 GeV and 280–470 GeV compared to previous ATLAS constraints.

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Keywords
  • Hadron-Hadron Scattering
  • Supersymmetry
  • P p: colliding beams
  • Transverse momentum: missing-energy
  • P p: scattering
  • Chargino: mass: lower limit
  • Chargino: pair production
  • W: leptonic decay
  • Higgs particle: hadronic decay
  • Bottom: pair production
  • Higgs particle: mass
  • Chargino: decay modes
  • Chargino: associated production
  • Neutralino: mass: lower limit
  • ATLAS
  • Final state: ((n)jet lepton)
  • Jet: bottom
  • Bottom: particle identification
  • Electroweak interaction
  • Sparticle: direct production
  • Supersymmetry: parameter space
  • Mass difference: (chargino neutralino)
  • CERN LHC Coll
  • Channel cross section: upper limit
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Colllaboration. Search for direct production of electroweakinos in final states with one lepton, jets and missing transverse momentum in pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector. In: The journal of high energy physics, 2023, vol. 2023, p. 167. doi: 10.1007/jhep12(2023)167
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Article (Published version)
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ISSN of the journal1029-8479
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