Inspired by the 750 GeV diphoton state recently reported by ATLAS and CMS, we propose a $U(1{)}_{B–L}$ extension of the MSSM which predicts the existence of four spin zero resonance states that are degenerate in mass in the supersymmetric limit. Vectorlike fields, a gauge singlet field, as well as the MSSM Higgsinos are prevented from acquiring arbitrary large masses by a $U(1)$ R symmetry. Indeed, these masses can be considerably lighter than the $Z^{\prime }$ gauge boson mass. Depending on kinematics, the resonance states could decay into right-handed neutrinos and sneutrinos, and/or MSSM Higgs fields and Higgsinos with total decay widths in the multi-GeV range.

• Received 26 February 2016

DOI:https://doi.org/10.1103/PhysRevD.93.111702