Abstract
We study models of gauge mediated SUSY breaking with more than one hidden sector. In these models the neutralino sector of the MSSM is supplemented with additional light neutral fermions, the nearly massless gravitino and the massive pseudo-goldstini. For the case where the Bino is the lightest ordinary SUSY particle, its preferred decay is to a photon and the heaviest pseudo-goldstino, which generically cascades down to lighter pseudo-goldstini, or to the gravitino, in association with photons. This gives rise to multiphoton plus missing energy signatures at the LHC. We investigate in detail simplified models where the SUSY spectrum consists of the right-handed sleptons, a Bino-like neutralino, the pseudo-goldstini and the gravitino. We compare against existing LHC searches and show that the sensitivity to our models could be significantly improved by relaxing the kinematic cuts and requiring additional final state particles. We propose inclusive searches in the final state with at least three photons plus missing energy and in the final state with at least two photons plus two leptons plus missing energy, the former being sensitive to any production mode and the latter being optimized for slepton pair production. We show that they could lead to an observation (or strong constraints) already with the data set from LHC Run I, and present prospects for LHC Run II.
Highlights
Phenomenology of GMSB with goldstini was discussed in [12] for the case where the LOSP was a gaugino-like neutralino or a stau, and in [13] for the case of higgsino LOSP
We propose inclusive searches in the final states ( 3)γ + E/ T and + − + ( 2)γ + E/ T, the former being sensitive to any production mode and the latter being optimized for slepton pair production
In this paper we discussed how the signatures of standard GMSB are modified in models where SUSY is broken in more than one hidden sector
Summary
In the general case where the visible SUSY sector (which, for definitiveness, we take to be the MSSM) is coupled to n SUSY breaking sectors (not directly interacting with each other), the MSSM soft masses can get contributions from all the n sectors. Since the fi’s are taken to be much greater than the VEVs of the auxiliary D and F terms of the gauge and Higgs superfields, the true goldstino will, to a good approximation, be aligned with the linear combination involving only the η’s, i.e. f1η1 + · · · + fnηn. Where the coefficients Ua can be determined by diagonalizing (2.2) Note that they are proportional to the hypercharge DY -term VEV, and they depend on the ratio of the contribution of each hidden sector to the Bino mass over the SUSY breaking scale. In order to obtain the relevant couplings of the mass eigenstate neutralino χand PGLD’s G(a), we take the last term of (2.4), sum over all the SUSY breaking sectors, and use (2.10) and (2.11). Mi denotes the mass of the messengers in the i:th hidden sector
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