Diphoton decay of the Higgs boson and new bound states of top and antitop quarks

摘要

We consider the constraints, provided by the LHC results on Higgs boson decay into 2 photons and its production via gluon fusion, on the previously proposed Standard Model (SM) strongly bound state S of six top quarks and six antitop quarks. A correlation is predicted between the ratios k(gamma) and k(g) of the Higgs diphoton decay and gluon production amplitudes, respectively to their SM values. We estimate the contribution to these amplitudes from one-loop diagrams involving the 12 quark bound state S and related excited states using an atomic physics based model. We find two regions of parameter space consistent with the ATLAS and CMS data on (k(gamma), k(g)) at the three sigma level: a region close to the SM values (k(gamma) = 1, k(g) = 1) with the mass of the bound state m(S) > 400 GeV and a region with (k(gamma) similar to 3/2, k(g) similar to -3/4) corresponding to a bound state mass of m(S) similar to 220 GeV.