Abstract
A search is performed for the electroweak pair production of charginos and associated production of a chargino and neutralino, each of which decays through an $R$-parity-violating coupling into a lepton and a $W$, $Z$, or Higgs boson. The trilepton invariant-mass spectrum is constructed from events with three or more leptons, targeting chargino decays that include an electron or muon and a leptonically decaying $Z$ boson. The analyzed dataset corresponds to an integrated luminosity of 139 fb$^{-1}$ of proton-proton collision data produced by the Large Hadron Collider at a center-of-mass energy of $\sqrt{s}$ = 13 TeV and collected by the ATLAS experiment between 2015 and 2018. The data are found to be consistent with predictions from the Standard Model. The results are interpreted as limits at 95% confidence level on model-independent cross sections for processes beyond the Standard Model. Limits are also set on the production of charginos and neutralinos for a Minimal Supersymmetric Standard Model with an approximate $B$-$L$ symmetry. Charginos and neutralinos with masses between 100 GeV and 1100 GeV are excluded depending on the assumed decay branching fractions into a lepton (electron, muon, or $\tau$-lepton) plus a boson ($W$, $Z$, or Higgs).
Highlights
The extension of the Standard Model (SM) of particle physics with supersymmetry (SUSY) [1,2,3,4,5,6] can introduce processes that violate baryon number (B) and lepton number (L) conservation, for instance proton decay
This paper presents a search for wino-type χχ
139 fb−1 of proton-protonpfficffiollision data produced at a center-of-mass energy of s 1⁄4 13 TeV and collected by the ATLAS experiment at the Large Hadron Collider (LHC) between 2015 and 2018
Summary
The extension of the Standard Model (SM) of particle physics with supersymmetry (SUSY) [1,2,3,4,5,6] can introduce processes that violate baryon number (B) and lepton number (L) conservation, for instance proton decay. Wino-type neutralino (χ01), the SUSY partners of the electroweak gauge fields of the W bosons Both LSP candidates were found to be nearly mass degenerate with one another for all simulations and both decay primarily via RPV couplings [24]. Previous searches for the production of wino-type charginos and neutralinos in R-parity-conserving models have targeted final states with three or more leptons via W and Z boson decays and found no significant excess in data over background expectations, with the ATLAS [25,26] and CMS [27,28] Collaborations setting limits on wino masses of up to 580 and 650 GeV, respectively.
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