Explaining a CMS eejj excess with R -parity violating supersymmetry and implications for neutrinoless double beta decay

A recent CMS search for the right handed gauge boson $W_R$ reports an interesting deviation from the Standard Model. The search has been conducted in the $eejj$ channel and has shown a 2.8$\sigma$ excess around $m_{eejj} \sim 2$ TeV. In this work, we explain the reported CMS excess with R-parity violating supersymmetry (SUSY). We consider resonant selectron and sneutrino production, followed by the three body decays of the neutralino and chargino via an $\mathcal{R}-$parity violating coupling. We fit the excess for slepton masses around 2 TeV. The scenario can further be tested in neutrinoless double beta decay ($0\nu \beta \beta$) experiments. GERDA Phase-II will probe a significant portion of the good-fit parameter space.This work has been partially supported by STFC. MM acknowledges partial support of the ITN INVISIBLES (Marie Curie Actions, PITN-GA-2011-289442).This is the accepted manuscript. The final version is available from APS at http://journals.aps.org/prd/abstract/10.1103/PhysRevD.91.01170

Resonant slepton production yields CMS eejj and e p Tjj excesses

Recent CMS searches for di-leptoquark production report local excesses of 2.4$\sigma$ in a $eejj$ channel and 2.6$\sigma$ in a $ejj$ missing $p_T$ channel. Here, we simultaneously explain both excesses with resonant slepton production in ${\mathcal R}-$parity violating supersymmetry (SUSY). We consider resonant slepton production, which decays to a lepton and a chargino/neutralino, followed by three-body decays of the neutralino/chargino via an $\mathcal{R}-$parity violating coupling. There are regions of parameter space which are also compatible at the 95% confidence level (CL) with a 2.8$\sigma$ $eejj$ excess in a recent CMS $W_R$ search, while being compatible with other direct search constraints. Phase-II of the GERDA neutrinoless double beta decay ($0\nu\beta\beta$) experiment will probe a sizeable portion of the good-fit region.This work has been partially supported by STFC. We thank the Cambridge SUSY working group for stimulating discussions. M. M. acknowledges partial support of the ITN INVISIBLES (Marie Curie Actions, PITN-GA-2011-289442).This is the accepted version. The final version is available from APS at http://journals.aps.org/prd/abstract/10.1103/PhysRevD.91.015011