Higgs-pair production and measurement of the triscalar coupling at LHC(8,14)LHC(8,14)

We simulate the measurement of the triscalar Higgs coupling at LHC(8,14)LHC(8,14) via pair production of h (125 GeV). We find that the most promising hh   final state is bb¯γγ. We account for deviations of the triscalar coupling from its SM value and study the effects of this coupling on the hh cross-section and distributions with cut-based and multivariate methods. Our fit to the hh   production matrix element at LHC(14) with 3 ab−13 ab−1 yields a 30% uncertainty on this coupling in the SM and a range of 20–60% uncertainties for non-SM values.