Symmetries Behind the 750 GeV Diphoton Excess

Understand

A 750 GeV resonance has been observed at the Run 2 LHC in the diphoton channel.

• In this paper, we explain this resonance as a CP-even scalar, S, that triggers the spontaneous breaking of local $U(1)_B$ or $U(1)_{B+L}$ gauge symmetries.
• S couples to gluon and photon pairs at the one-loop level, where particles running in the loop are originally introduced to cancel anomalies.
• The gluon fusion is the dominate production channel of S at the LHC.