Soft RPV through the baryon portal

Abstract

Supersymmetric (SUSY) models with R-parity generically predict sparticle decays with invisible neutralinos, which yield distinctive missing energy events at colliders. Since most LHC searches are designed with this expectation, the putative bounds on sparticle masses become considerably weaker if R-parity is violated so that squarks and gluinos decay to jets with large QCD backgrounds. Here we introduce a scenario in which baryonic R-parity violation (RPV) arises effectively from soft SUSY breaking interactions, but leptonic RPV remains accidentally forbidden to evade constraints from proton decay and FCNCs. The model features a global R-symmetry that initially forbids RPV interactions, a hidden R-breaking sector, and a heavy mediator that communicates this breaking to the visible sector. After R-symmetry breaking, the mediator is integrated out and an effective RPV A-term arises at tree level; RPV couplings between quarks and squarks arise only at loop level and receive additional suppression. Although this mediator must be heavy compared to soft masses, the model introduces no new hierarchy since viable RPV can arise when the mediator mass is near the SUSY breaking scale. In generic regions of parameter space, a light thermally-produced gravitino is stable and can be a viable dark matter candidate.

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

“…in Partial Compositness (see [10] for a discussion on RPV in PC) and Minimal Flavor Violating SUSY (see [11,12] for the formulation of the MFV SUSY ansatz, and [13,14] for models in which MFV is implemented in the RPV sector), where one can also reasonably assume the B-violating couplings to be much larger than the L-violating ones. The possibility to avoid proton decay and other phenomenological constraints even in models with RPV, makes the latter interesting for model building (see [15][16][17][18][19][20][21] for more models of RPV).…”

Phenomenology of a long-lived LSP with R-parity violation

“…Many of the constraints from standard superpartner searches can be evaded if the assumption of exact R-parity conservation is relaxed (see e.g. [12][13][14][15][16][17][18][19][20][21][22][23][24][25] and references therein). In particular, if the LSP decays inside the detector, then supersymmetry searches which require large missing transverse energy (MET) will not be applicable to these models.…”

Gravitino dark matter and flavor symmetries

“…• λ 323 = 10 −7 ; in Ref. [53], it was discussed how large R-parity violation would have washed out baryon number in the early universe if the B-violating processes were in equilibrium at a temperature of orderm, and how RPV SUSY at colliders would most likely involve displaced vertices (this was also pointed out in [10] in the context of horizontal symmetries, and in [54]). In Figure 5, the requirement λ 323 < 10 −7 is automatically satisfied for m 3/2 500 GeV for TeV-scale SUSY.…”