Resonant slepton production yields CMSeejjandepT

Abstract

Recent CMS searches for dileptoquark production report local excesses of 2Ao in an eejj channel and 2.6a in an eprjj channel. Here, we simultaneously explain both excesses with resonant slepton production in 72-parity violating supersymmetry. 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 72-parity violating coupling. There are regions of parameter space which are also compatible at the 95% confidence level with a 2.8a eejj excess in a recent CMS WR search, while being compatible with other direct search constraints. Phase II of the GERDA neutrinoless double beta decay (Duft/S) experiment will probe a sizable portion of the good-fit region. The recent CM S search for dileptoquark production found, with a certain set o f cuts, a 2.4cr local excess in the eejj channel and a 2.6 c local excess in an ePT j j channel1 in com parison to Standard M odel (SM ) expect ations. The CM S searches use pp collision data at the Large H adron C ollider (LHC) and a center o f mass energy o f 8 TeV and 19.6 f t r 1 o f integrated luminosity. Requiring a certain set o f cuts (called "MLq = 650 G eV " cuts), CMS reported 36 events on a background2 o f 20.5 ± 3.5 in the eejj channel, and 18 events on a background o f 7.5 ± 1 .6 in the evjj channel [1]. Taken sim ultaneously and ignoring correlations betw een the systematics, these excesses am ount to a 3.5cr effect. In addition, a WR search (with different cuts to the dileptoquark search) reported a 2.80-excess in the eejj channel at 1.8 TeV < Meejj < 2.2 TeV [2]. These excesses are not significant enough to claim a discovery, or even evidence. They are sim ilar enough to attem pt a unified explanation of all three, and a timely explanation before the next LHC run (ran II) in terms of new physics such that further tests can be applied and analysis strategies can be set for run II.There have been a few attempts to explain the CMS excesses with different models. Coloron-assisted leptoquarks were proposed in Ref. [3]. The WR excess was interpreted in grand unified theory m odels in Refs. [4,5], In Ref. [6], pair production o f vectorlike leptons was proposed via W '/Z ' vector bosons. Reference [7] perform ed a detailed analysis (including a general flavor structure) of W'/Z' interpretations o f the WR search data. In Ref. [8], it was supposed that leptoquarks consistent with the 1 CMS refers to this channel as evjj, and we shall from here use the same nomenclature. 2We have added systematic and statistical errors in quadrature. dileptoquark excess decay into dark m atter particles with a significant branching ratio. Reference [9] explains the dileptoquark excesses with di-sbottom production, fol lowed by 72-parity violating (RPV) decay. In a previous article [10], w e proposed that resonant slepton production was responsible for the WR search excess in RPV supersymmetry. One o f us showed that this explanation is also consistent with recent deviations from SM prediction m easur...

Reconciling the 2 TeV excesses at the LHC in a linear seesaw left-right model

“…Other analyses in the context of LRSMs were performed in [40,[42][43][44][45][46][47]. The excess has also been discussed in wider theoretical contexts [48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65].…”

Explaining the CMSeejjandepTjDhuria1, Hati2, Rangarajan3 et al. 2015Phys. Rev. D220240View full textAdd to dashboardCite

“…In Refs. [7,8], the excess of eejj events has been shown to occur in R-parity violating processes via the resonant production of a slepton. In Ref.…”

“…The added advantage of this scenario is that unlike Rparity violating slepton decay in Refs. [7,8], the production as well as decay of the exotic slepton in this scenario involves only R-parity conserving interactions. Interestingly, one of the two effective low-energy subgroups (generally known as the Alternative Left-right Symmetric Model (ALRSM)) also explains high-scale leptogenesis.…”

B ¯ → D ∗ τ ν ¯ $$ \overline{B}\to {D}^{\left(\ast \right)}\tau \overline{\nu} $$ excesses in ALRSM constrained from B, D decays and D 0 − D ¯ 0 $$ {D}^0-{\overline{D}}^0 $$ mixing

“…[38], while other NP scenarios have been proposed in refs. [39][40][41][42][43][44][45][46][47][48][49][50][51]. Interestingly, in some of these NP scenarios attempts were made to explain the discrepancies in decays of B meson in an unified framework [43] or separately [26].…”