Searches for R -parity-violating supersymmetry in pp collisions at s=8 

Abstract

Results are presented from searches for R-parity-violating supersymmetry in events produced in pp collisions at ffiffi ffi s p ¼ 8 TeV at the LHC. Final states with 0, 1, 2, or multiple leptons are considered independently. The analysis is performed on data collected by the CMS experiment corresponding to an integrated luminosity of 19.5 fb −1 . No excesses of events above the standard model expectations are observed, and 95% confidence level limits are set on supersymmetric particle masses and production cross sections. The results are interpreted in models featuring R-parity-violating decays of the lightest supersymmetric particle, which in the studied scenarios can be either the gluino, a bottom squark, or a neutralino. In a gluino pair production model with baryon number violation, gluinos with a mass less than 0.98 and 1.03 TeV are excluded, by analyses in a fully hadronic and one-lepton final state, respectively. An analysis in a dilepton final state is used to exclude bottom squarks with masses less than 307 GeV in a model considering bottom squark pair production. Multilepton final states are considered in the context of either strong or electroweak production of superpartners and are used to set limits on the masses of the lightest supersymmetric particles. These limits range from 300 to 900 GeV in models with leptonic and up to approximately 700 GeV in models with semileptonic R-parity-violating couplings.

Exotic lepton-flavor violating Higgs decays

“…We simulated the production of multi-lepton final states in our model assuming the same event selection criteria as Ref. [53]. The model is implemented in FeynRules [78,79], and we use MadGraph-5 [80] to generate the parton level events.…”

“…A summary of the cuts implemented from Ref. [53] are presented in Table 3. Lepton identification is modeled using the quoted cms id efficiencies in Ref.…”

“…Lepton identification is modeled using the quoted cms id efficiencies in Ref. [83] for electrons and muons, and assuming a 70% efficiency for the hadronic taus [53]. The momenta of leptons are corrected using the cms detector resolution for electron momentum [84] and assuming a resolution of 1% in the barrel (|η| < 0.9), 3% in the endcaps (1.2 ≤ |η| ≤ 2.4), and 2% in the overlap region (0.9 ≤ |η| < 1.2) for muons [85].…”

“…Conditions Table 3: Summary of the cuts implemented in our simulation [53]. Jets are reconstructed using the anti-kT algorithm [86] with a distance parameter R = 0.5, and in the last row stands for the isolated electron, muon, or τ h candidates.…”

“…In the τ cases, most of the events fall into higher background bins, notably the 3-leptons, 1-τ h and 1-ossf (0-ossf) of Ref. [53] for Model Cµτ (Rµτ ). As one would expect,…”