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Manuscript Title: eHDECAY: an Implementation of the Higgs Effective Lagrangian into HDECAY
Authors: Roberto Contino, Margherita Ghezzi, Christophe Grojean, Margarete Mühlleitner, Michael Spira
Program title: eHDECAY
Catalogue identifier: AEUJ_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 185(2014)3412
Programming language: Fortran77.
Computer: Any with a Fortran77 system.
Operating system: Linux, Unix.
RAM: 0.5MB
Keywords: Higgs decays, Loop decays, Higher order corrections to decays, Effective theories.
Classification: 11.1.

Nature of problem:
Numerical calculation of the decay widths and branching ratios of a Higgs like boson within four different parametrisations: the non-linear Lagrangian, the Strongly-Interacting Light Higgs (SILH) Lagrangian and the MCHM4 and MCHM5 Lagrangians. The Fortran program eHDECAY includes the most important higher-order QCD effects and in case of the SILH and composite Higgs parametrisation also the electroweak (EW) higher order corrections. The user furthermore has the possibility to turn off these EW corrections.

Solution method:
The necessary input values, the choice of the parametrisation and the values of the various couplings are set in the input file ehdecay.in. These are read in by the main routine ehdecay.f. The main routine calculates the decay widths and branching ratios through analytical formulae, by using several help routines (dmb.f, elw.f, feynhiggs.f, haber.f, hgaga.f, hgg.f, hsqsq.f, susylha.f). The calculated branching ratios and total width are given out in the files br.eff1 and br.eff2.

The EW corrections are included only in the SILH and the composite Higgs parametrisation in an approximate way. They are consistently not included in the non-linear case. This would require the explicit calculation of the EW higher order correctons in this framework. The program does not provide any distributions.

Running time:
Less than second per point