750 GeV resonance in the gauged U(1)′-extended MSSM

Recently the ATLAS and CMS Collaborations at the LHC announced their observation of a potential 750 GeV di-photon resonance, after analyzing the s=13 TeV LHC data. This observation has significant implications for low-energy supersymmetry. Beyond the MSSM and the NMSSM, we study the MSSM-extensions with an extra U(1)′U(1)′ gauge symmetry. The anomaly cancellation and the spontaneous breaking of the non-decoupled U(1)′U(1)′ generally require introducing vector-like supermultiplets (both colored and color-neutral ones) and singlet supermultiplets, respectively. We illustrate that the potential 750 GeV resonance (Y  ) can be accommodated in various mechanisms, as a singlet-like scalar or pseudoscalar. Three benchmark scenarios are presented: (1) vector-like quarks (VLQ) mediated pp→Y→γγpp→Y→γγ; (2) scalar VLQ mediated pp→Y→γγpp→Y→γγ; (3) heavy scalar (pseudo-scalar) H/AH/A associated production pp→H⁎/A⁎→YH/hpp→H⁎/A⁎→YH/h. Additionally, we notice that the Z′Z′-mediated vector boson fusion production and Z′Z′-associated production pp→Yqq′pp→Yqq′, if yielding a signal rate of the observed level, might have been excluded by the searches for Z′Z′ via Drell–Yan process at the LHC.