Abstract
AbstractWe investigate the LHC sensitivity to supersymmetric models with light higgsinos, small R-parity breaking and gravitino dark matter. The limits on decaying gravitino dark matter from gamma-ray searches with the Fermi-LAT put a lower bound on the higgsino-like neutralino NLSP decay length, giving rise to a displaced-vertex collider signature. Using publicly available tools for simulation of signal, background and detector response, we find that higgsinos with masses of 100 – 400 GeV and R-parity violation ofζ~ 10−8– 10−9can show up in the 8 TeV LHC data with 10 – 30 fb−1of integrated luminosity. We demonstrate that in the case of a signal, the higgsino mass can be determined by reconstruction of the dimuon mass edge.
Highlights
The SM processes that dominate the dimuon channel are: γ∗/Z∗ → μ+μ− tt V ∗V ∗, where V = W, Z.we give the next-to-leading order (NLO) cross section for the processes that we have simulated for our study
We will discuss why the signal we consider would hide from the LHC searches performed so far, and show that the search strategy that we propose here could reveal new physics already in the data accumulated during the LHC runs with proton collisions at 8 TeV center-of-mass energy
Since right-handed neutrinos are created from B−L Higgs decays, this scenario allows for gravitino dark matter, leptogenesis and the correct values for the neutrino mass parameters while requiring lower reheating temperatures compared to the thermal leptogenesis case
Summary
If we abandon the requirement of R-parity, the additional terms in the MSSM superpotential together with the soft terms introduce 99 new free parameters into the model [29]. By allowing only for the bilinear terms, baryon number is conserved, and the number of new parameters is reduced to 9 [29, 30]) Such a scenario can be realised through the spontaneous breaking of B − L, the difference between baryon and lepton number [19].
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