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Recently there has been a huge interest in the diphoton excess around 750 GeVreported by both ATLAS and CMS collaborations, although the newest analysiswith more statistics does not seem to support the excess. Nevertheless, thediphoton channel at the LHC experiments are a powerful tool to probe a newphysics. One of the most natural explanations of a diphoton excess, if itoccurs, could be a new scalar boson with exotic colored particles. In thissetup, it would be legitimate to ask what is the role of this new scalar innature. A heavy neutral gauge boson ($Z'$) is one of the traditional targets ofthe discovery at the collider experiments with numerous motivations. While theLandau-Yang theorem dictates the diphoton excess cannot be this spin-1 gaugeboson, there is a strong correlation of a new heavy gauge boson and a newscalar boson which provides a mass to the gauge boson being at the same massscale. In this paper, we point out a simple fact that a new scalar with aproperty similar to the recently highlighted 750 GeV would suggest an existenceof a TeV scale $Z'$ gauge boson that might be within the reach of the LHC Run 2experiments. We take a scenario of the well-motivated and popular gauged $B-L$symmetry and require the gauge coupling unification to predict the mass andother properties of the $Z'$ and illustrate the discovery of the $Z'$ wouldoccur during the LHC experiments.

Diphoton channel at the LHC experiments to find a hint for a new heavy gauge boson