Higgs Pseudo-Observables, Second Riemann Sheet and All That

Details Higgs Pseudo-Observables, Second Riemann Sheet and All That Higgs Pseudo-Observables, Second Riemann Sheet and All That

2010-01-19

arxiv.org/abs/1001.3360v1

Nucl.Phys.B834:77-115,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

36 pages, 19 figures, 4 Tables

Scientific paper

10.1016/j.nuclphysb.2010.03.013

The relation between physical observables measured at LHC and Tevatron and standard model Higgs pseudo-observables (production cross section and partial decay widths) is revised by extensively using the notion of the Higgs complex pole on the second Riemann sheet of the $S $-matrix. The extension of their definition to higher orders is considered, confronting the problems that arise when QED(QCD) corrections are included in computing realistic observables. Numerical results are presented for pseudo-observables related to the standard model Higgs boson decay and production. The relevance of the result for exclusion plots of the standard model Higgs boson for high masses (up to $600 $GeV) is discussed. Furthermore, a recipe for the analytical continuation of Feynman loop integrals from real to complex internal masses and complex Mandelstam invariants is thoroughly discussed.

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