Madwidth does not include all relevant decay modes
Hi Authors,
I am having some issues generating the decays of gluino with Madwidth. I am using the MSSM+gravitino model file provided with Feynrules. I have generated the spectrum using SPheno. First, I made the gravitino and goldstino heavy in the param card and tried calculating the decay table for gluino. And I get the correct result. Below is the command I used and the result I got:
command : compute_widths go --path=
Results:
# PDG Width
DECAY 1000021 2.168630e-06
# BR NDA ID1 ID2 ...
4.568783e-01 3 -6 5 1000024 # 9.90799987729e-07
4.566846e-01 3 -1000024 -5 6 # 9.90379924098e-07
2.407050e-02 3 -6 6 1000022 # 5.2200008415e-08
1.042179e-02 3 -5 5 1000022 # 2.26010064477e-08
9.784979e-03 3 -1 1 1000022 # 2.121999900877e-08
9.753162e-03 3 -3 3 1000022 # 2.115099970806e-08
7.726537e-03 3 -6 6 1000025 # 1.675599993431e-08
4.932607e-03 3 -2 2 1000022 # 1.069699951841e-08
4.915546e-03 3 -4 4 1000022 # 1.0660000521979
3.713035e-03 3 -2 2 1000025 # 8.0521990920499
3.699663e-03 3 -4 4 1000025 # 8.02320017169e-09
1.835583e-03 3 -5 5 1000025 # 3.9807003612899
1.560985e-03 3 -1 1 1000025 # 3.3851989005499
1.555498e-03 3 -3 3 1000025 # 3.3732996277399
6.179016e-04 3 -1000024 -1 2 # 1.3399999468079
6.176710e-04 3 -2 1 1000024 # 1.3394998607299
6.158266e-04 3 -4 3 1000024 # 1.335500039558e-09
6.158266e-04 3 -1000024 -3 4 # 1.335500039558e-09
Later, I used the same param_card but made the gravitino light (= 1eV). Technically, the gluino should decay to the gravitino (a two-body decay) and the other decay channels (3 body decays) I got earlier. I used the same command, but here is what I got as the decay table:
# PDG Width
DECAY 1000021 5.892100e-06
# BR NDA ID1 ID2 ...
1.000000e+00 2 21 1000049 # 5.8921e-06
I have calculated the above decay widths by hand, and they are correct. The only problem is that MW is not calculating three-body decay widths when the gravitino is light. And as we can see, the branching ratios are also significant.
P.S: I am using MG5_aMC_v3_4_0
Please look into the issue.
Best,
Rameswar
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