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Description:
The Georgi-Machacek model adds scalar triplets to the Standard Model Higgs
sector in such a way as to preserve custodial SU(2) symmetry in the scalar
potential. This allows the triplets to have a non-negligible vacuum
expectation value while satisfying constraints from the rho parameter.
Depending on the parameters, the 125 GeV neutral Higgs particle can have
couplings to WW and ZZ larger than in the Standard Model due to mixing
with the triplets. The model also contains singly- and doubly-charged
Higgs particles that couple to vector boson pairs at tree level (WZ and
like-sign WW, respectively).
GMCALC is a FORTRAN program that, given a set of input
parameters, calculates the particle spectrum and tree-level couplings,
checks theoretical and indirect constraints on the model, and computes
the branching ratios and total widths of the scalars. It also generates
a param_card.dat file for MadGraph5 (LO, NLO, and an EFT version)
to be used with the corresponding
FeynRules
model implementations.
The full functionality of GMCALC v1.3.0 and higher requires an
installation of the
LoopTools package.
There is an option to compile GMCALC v1.3.0 and higher without
LoopTools; if this is used then the loop-induced decay widths of H_5^0
to Z gamma and H_3^+, H_5^+ to W^+ gamma will be set to zero.
GMCALC v1.5.0 and higher includes an interface to
HiggsBounds/HiggsSignals
(HB/HS).
GMCALC's interface supports HiggsBounds 5.3.2 and HiggsSignals 2.2.3
(later versions of HB/HS are not yet supported). Proper compilation of the
HB/HS interface requires gfortran version 5 or later.
Authors:
- Ameen Ismail, Ben Keeshan, Heather E. Logan, and Yongcheng Wu (v.1.5.x) and all authors of previous versions
- Celine Degrande, Katy Hartling, Kunal Kumar, Heather E. Logan, Andrea D. Peterson, Mark B. Reimer, and Yongcheng Wu (v1.4.x)
- Celine Degrande, Katy Hartling, Kunal Kumar, Heather E. Logan, and Andrea D. Peterson (v1.3.x)
- Katy Hartling, Kunal Kumar, Heather E. Logan, and Andrea D. Peterson (v1.2.x)
- Katy Hartling, Kunal Kumar, and Heather E. Logan (v1.0.x, 1.1.x)
Downloads:
If you use this program to write a paper, please cite:
The physics that went into this code is described in more detail
in the following references:
- K. Hartling, K. Kunal, and H. E. Logan,
"The decoupling limit in the Georgi-Machacek model,"
Phys. Rev. D 90, 015007 (2014)
[arXiv:1404.2640 [hep-ph]]
[InSPIRE record].
- K. Hartling, K. Kunal, and H. E. Logan,
"Indirect constraints on the Georgi-Machacek model and implications for Higgs couplings,"
Phys. Rev. D 91, 015013 (2015)
[arXiv:1410.5538 [hep-ph]]
[InSPIRE record].
- C. Degrande, K. Hartling, and H. E. Logan,
"Scalar decays to gamma gamma, Z gamma, and W gamma in the Georgi-Machacek model,"
Phys. Rev. D 96, 075013 (2017)
[arXiv:1708.08753 [hep-ph]]
[InSPIRE record].
Requests and bug reports:
Contact Heather Logan at
logan@physics.carleton.ca.
Older versions:
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