Abstract
We find constraints on R-Parity Violating (RPV) couplings of the minimal supersymmetric standard model, using Drell-Yan differential cross sections at the LHC. Specifically, we look at the constraints on $\lambda'LQD^c$ couplings from monolepton and dilepton data published by ATLAS, with either electrons or muons in the final state. Out of the 18 RPV couplings to which the LHC is at least potentially sensitive by this technique, we find new limits on 12 (or 13) of them, for squarks masses above 1 (or 2) TeV. We also show that one can employ our techniques to achieve significantly stronger bounds at a high-luminosity upgrade of the LHC.
Highlights
Supersymmetry (SUSY) has long been considered one of the best motivated extensions of the Standard Model (SM) and is actively sought at the Large Hadron Collider (LHC) and in other experiments at both low and high energies
The advantages of R-parity are well known, including the elimination of a set of allowed terms in the Lagrangian that generate fast proton decay, and the prediction of a dark matter candidate whose production at the LHC plays a key role in most SUSY search strategies
The effect of virtual exchange of scalar leptoquarks in DY processes has been studied previously [4,5] and found to provide extremely strong constraints on the parameter space of those leptoquarks. We extend those results to the study of RPV squarks and find powerful constraints at the LHC
Summary
Supersymmetry (SUSY) has long been considered one of the best motivated extensions of the Standard Model (SM) and is actively sought at the Large Hadron Collider (LHC) and in other experiments at both low and high energies. It has long been understood that one could keep a subset of the terms forbidden by R-parity, either those that violate lepton number (L) or those that violate baryon number (B)— but not both—without destabilizing the proton Such models, known as R-parity-violating (RPV) models, have the disadvantage of not trivially providing a candidate for the Universe’s dark matter, but are otherwise perfectly reasonable SUSY extensions of the SM. The second ingredient is the observation that the presence of the operator LQDc in the superpotential causes the left-handed squarks (both up- and down-type) and the right-handed down-type squarks to behave as scalar leptoquarks This allows them to couple to both initial state quarks and to final state leptons, mimicking Drell-Yan (DY) processes at the LHC.
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