Supersymmetric crevices: Missing signatures ofR-parity violation at the LHC

Abstract

Supersymmetry is under pressure from LHC searches requiring colored superpartners to be heavy. We demonstrate R-parity violating spectra for which the dominant signatures are not currently well searched for at the LHC. In such cases, the bounds can be as low as 800 GeV on both squarks and gluinos. We demonstrate that there are nontrivial constraints on squark and gluino masses with baryonic RPV (U DD operators) and show that in fact leptonic RPV can allow comparable or even lighter superpartners. The constraints from many searches are weakened if the LSP is significantly lighter than the colored superpartners, such that it is produced with high boost. The LSP decay products will then be collimated, leading to the miscounting of leptons or jets and causing such models to be missed even with large production cross-sections. Other leptonic RPV scenarios that evade current searches include the highly motivated case of a higgsino LSP decaying to a tau and two quarks, and the case of a long-lived LSP with a displaced decay to electrons and jets. The least constrained models can have SUSY production cross-sections of ∼ pb or larger, implying tens of thousands of SUSY events in the 8 TeV data. We suggest novel searches for these signatures of RPV, which would also improve the search for general new physics at the LHC.

The minimal SUSY B − L model: from the unification scale to the LHC

“…While only a few studies have been done on the phenomenology of the minimal B − L MSSM [17,18,31,32], there have been several works on the phenomenology of explicit bilinear R-parity violation, which has some similarities to this model. References to such papers are mentioned below although see [76][77][78][79] for general discussions. Table 4 provides some basic information on the most probable decay modes of each of the possible LSP's.…”

Weak scale baryogenesis in a supersymmetric scenario with R-parity violation

“…(4.1) is the formal expression of the so-called WIMP miracle: the abundance of a weakly interacting species with m WIMP ∼ O(TeV) matches the order of magnitude of the observed Ω DM . 7 In the approximation of infinite lifetime, the relic abundance of a metastable WIMP is also given by (4.1). As proposed in [1], if the BAU is generated by the decay of such a WIMP χ, today's abundance 7 However it is clear from (4.1) that the observed DM abundance can be obtained also from lighter or heavier particles, with couplings that are smaller or larger than the weak one (see e.g.…”

Affleck-Dine baryogenesis withR-parity violation

“…Indeed, sizable R-parity violating interactions can be obtained in the framework of grand unified theories [12]. The introduction of the R-parity violation is getting more attention these days, since it modifies the signatures observed at the LHC, which relaxes the stringent limits on the masses of supersymmetric particles [13][14][15][16].…”

“…We find that the effect of the early oscillation becomes important in this case, and hence the bound for the survival of Q-ball [Eq. It is argued that the existence of R-parity violating couplings can mitigate the constraints on the spectrum of superpartners in the collider experiments [13][14][15][16]. Among them, a large lepton number violating couplings (λ and λ ′ ) lead to the decay of gluinos into leptons, and the null observation of such events gives a severe bound on the gluino masses.…”

“…6 We note that the effect of the term proportional to a h can be omitted after inflation [60]. After the end of inflation, the inflaton field I begins to oscillate around the minimum I min so that the Kähler and superpotential can be written as 16) whereÎ = I − I min and M inf is the mass of the inflaton. Since the term with a h is proportional to the rapidly oscillating factor …”