param_card.dat info

Hi,

see section 3.3 of http://arxiv.org/pdf/hep-ph/0311123v4.pdf

Note that MG do not use the branching ratio line in his computation (but it uses the total width)

Cheers,

Olivier

> On Nov 20, 2015, at 04:37, Dylan Gray <email address hidden> wrote:
>
> New question #274925 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/274925
>
> Hello! I generated the process H to z gamma qcd = 0, and at the end of the param_card.dat there is a table of Decay Widths and BR. Can some one explain what this is exactly? It has appeared in a few of my param_card.dat files for different processes.
>
> Here is the Proc Card:
>
> set group_subprocesses Auto
> set ignore_six_quark_processes False
> set loop_optimized_output True
> set gauge unitary
> set complex_mass_scheme False
> import model sm
> define p = g u c d s u~ c~ d~ s~
> define j = g u c d s u~ c~ d~ s~
> define l+ = e+ mu+
> define l- = e- mu-
> define vl = ve vm vt
> define vl~ = ve~ vm~ vt~
> import model HC_NLO_X0_UFO
> generate x0 > z a QCD=0
> output x0_z_a_qcd0
>
> Here is the part of param_card in question:
>
> #
> #*************************
> # Decay widths *
> #*************************
> #
> # PDG Width
> DECAY 1 0.000000e+00
> #
> # PDG Width
> DECAY 2 0.000000e+00
> #
> # PDG Width
> DECAY 3 0.000000e+00
> #
> # PDG Width
> DECAY 4 0.000000e+00
> #
> # PDG Width
> DECAY 5 0.000000e+00
> #
> # PDG Width
> DECAY 6 1.491500e+00
> #
> # PDG Width
> DECAY 11 0.000000e+00
> #
> # PDG Width
> DECAY 12 0.000000e+00
> #
> # PDG Width
> DECAY 13 0.000000e+00
> #
> # PDG Width
> DECAY 14 0.000000e+00
> #
> # PDG Width
> DECAY 15 0.000000e+00
> #
> # PDG Width
> DECAY 16 0.000000e+00
> #
> # PDG Width
> DECAY 21 0.000000e+00
> #
> # PDG Width
> DECAY 22 0.000000e+00
> #
> # PDG Width
> DECAY 23 2.441404e+00
> #
> # PDG Width
> DECAY 24 2.047600e+00
> #
> # PDG Width
> DECAY 25 4.516160e-04
> # BR NDA ID1 ID2 ...
> 1.512236e-01 3 -2 1 24 # 6.82949973376e-05
> 1.512236e-01 3 -4 3 24 # 6.82949973376e-05
> 1.501608e-01 3 -24 -1 2 # 6.78150198528e-05
> 1.501608e-01 3 -24 -3 4 # 6.78150198528e-05
> 5.024955e-02 3 -12 11 24 # 2.26935007728e-05
> 5.024955e-02 3 -14 13 24 # 2.26935007728e-05
> 5.013773e-02 3 -24 -11 12 # 2.26430010717e-05
> 5.013773e-02 3 -24 -13 14 # 2.26430010717e-05
> 4.973030e-02 3 -24 -15 16 # 2.24589991648e-05
> 4.972144e-02 3 -16 15 24 # 2.2454997847e-05
> 1.513011e-02 3 -1 1 23 # 6.83299975776e-06
> 1.513011e-02 3 -3 3 23 # 6.83299975776e-06
> 1.223938e-02 3 -5 5 23 # 5.52749983808e-06
> 1.197035e-02 3 -2 2 23 # 5.4060015856e-06
> 1.197035e-02 3 -4 4 23 # 5.4060015856e-06
> 6.824602e-03 3 -12 12 23 # 3.08209990845e-06
> 6.824602e-03 3 -14 14 23 # 3.08209990845e-06
> 6.824602e-03 3 -16 16 23 # 3.08209990845e-06
> 3.390823e-03 3 -11 11 23 # 1.53134991997e-06
> 3.390823e-03 3 -13 13 23 # 1.53134991997e-06
> 3.309227e-03 3 -15 15 23 # 1.49449986083e-06
> #
> # PDG Width
> DECAY 82 0.000000e+00
>
>
>
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Hello Olivier,

I would like to thank you for your response. You have resolved my problem. I am an undergraduate doing research with a professor and am not entirely familiar with everything. I appreciate you help.

Best,

Dylan