E6 inspired composite Higgs model and 750 GeV diphoton excess
Abstract
In the E6 inspired composite Higgs model (E6CHM) the strongly interacting sector possesses an SU(6)× U(1)B× U(1)L global symmetry. Near scale f 10 TeV the SU(6) symmetry is broken down to its SU(5) subgroup, that involves the standard model (SM) gauge group. This breakdown of SU(6) leads to a set of pseudo--Nambu--Goldstone bosons (pNGBs) including a SM--like Higgs and a SM singlet pseudoscalar A. Because of the interactions between A and exotic fermions, which ensure the approximate unification of the SM gauge couplings and anomaly cancellation in this model, the couplings of the pseudoscalar A to gauge bosons get induced. As a result, the SM singlet pNGB state A with mass around 750 GeV may give rise to sufficiently large cross section of pp γγ that can be identified with the recently observed diphoton excess.
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