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

We simulate the measurement of the triscalar Higgs coupling at LHC(8,14) via pair production of h (125 GeV). We find that the most promising his final state is b (b) over bar gamma gamma. 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(-1) yields a 30% uncertainty on this coupling in the SM and a range of 20-60% uncertainties for non-SM values. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.