Stringent Dilepton Bounds on Left-Right Models using LHC data

الأصل · EN

In canonical left-right symmetric models the lower mass bounds on the charged gauge bosons are in the ballpark of 3-4 TeV, resulting into much stronger limits on the neutral gauge boson Zᵣ, making its production unreachable at the LHC. However, if one evokes different patterns of left-right symmetry breaking the Zᵣ might be lighter than the Wᵣ± motivating an independent Zᵣ collider study. In this work, we use the 8 TeV ATLAS 20.3 fb⁻¹ luminosity data to derive robust bounds on the Zᵣ mass using dilepton data. %because they provide the most restrictive limits due to the sizable Zᵣ-lepton couplings. We find strong lower bounds on the Zᵣ mass for different right-handed gauge couplings, excluding Zᵣ masses up to 3.2TeV. For the canonical LR model we place a lower mass bound of 2.5TeV. Our findings are almost independent of the right-handed neutrino masses (2% effect) and applicable to general left-right models.