Supersoft SUSY Models and the 750 GeV Diphoton Excess, Beyond Effective Operators

TL;DR

This paper explores supersymmetric models with a scalar sbino particle that could explain the 750 GeV diphoton excess observed at the LHC, analyzing effective operators and loop-induced couplings.

Contribution

It introduces a supersymmetric explanation for the diphoton excess involving the sbino and studies its couplings through effective operators and heavy sfermion loops.

Findings

The sbino can have a significant decay width via Higgs sector couplings.

Gluon fusion production of the sbino can account for the diphoton excess.

The model fits the observed excess with plausible decay rates.

Abstract

We propose that the sbino, the scalar partner of a Dirac bino can explain the 750 GeV diphoton excess observed by ATLAS and CMS . We analyze a model in which the sbino couples to pairs of Standard Model (SM) gauge bosons. We analyze an effective operator model, as well as a completion in which the sbino couples to pairs of gauge bosons through loops of heavy sfermions. We find that the sbino may be given an appreciable decay width through tree level coupling in the Higgs or Higgsino sector and additionally fit the 750 GeV excess by considering gluon fusion processes with decay to diphotons.