A framework for Higgs characterisation

Abstract

We introduce a framework, based on an effective field theory approach, that allows one to perform characterisation studies of the boson recently discovered at the LHC, for all the relevant channels and in a consistent, systematic and accurate way. The production and decay of such a boson with various spin and parity assignments can be simulated by means of multi-parton, tree-level matrix elements and of next-to-leading order QCD calculations, both matched with parton showers. Several sample applications are presented which show, in particular, that beyond-leading-order effects in QCD have non-trivial phenomenological implications.

36 pages, 13 figures, 3 tables; v2: some issues clarified and references added, version to appear in JHEP; v3: sign error of g_AVV in table 2 corrected

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