wired decay width with three- and four-body decay channels
Hi experts,
I'm generating a process like " p p > A B, ( A > a b), ( B > c d, c > e f, d > g h)", where A and B are BSM particles and the decay width for them are calculated automatically by setting the appropriate parameters to be "Auto" in the parameter card.
The result for A is reasonable, but for B, the decay width result is incorrect (off by a factor of 10^4 compared with theoretical value). In the parameter card, I found the following (see below), which seems that when MadGraph calculates the decay width, three-body and four-body decay channels are also included. I checked my UFO file and am sure that no such decay channels are included in the decay.py file. So what's going on here? Any ideas?
Thanks a lot,
Yong
*************** problem described above can be found in detailed here *******
MadGraph decay width calculation result in the param_card.dat
*******
# PDG Width
168 DECAY 9000002 9.517513e-05
169 # BR NDA ID1 ID2 ...
170 7.126862e-01 4 -3 4 22 22 # 6.78299965826e-05
171 2.467872e-01 4 -15 16 22 22 # 2.34879988927e-05
172 3.766320e-02 4 -1 4 22 22 # 3.58460019995e-06
173 2.002203e-03 4 -5 6 22 22 # 1.90559964632e-07
174 7.391216e-04 4 22 22 23 24 # 7.03459931693e-08
175 7.596190e-05 2 25 24 # 7.22968349562e-09
176 2.830779e-05 2 24 23 # 2.69419755389e-09
177 1.138631e-05 2 6 -5 # 1.08369372788e-09
178 4.554131e-06 3 24 25 25 # 4.33440020471e-10
179 8.045484e-07 3 -5 6 25 # 7.6573000263e-11
180 6.605717e-07 3 -24 24 24 # 6.28699950662e-11
181 3.344466e-07 3 -6 6 24 # 3.18309992274e-11
182 1.497030e-07 3 -5 6 23 # 1.42480005956e-11
183 9.358371e-10 2 16 -15 # 8.90684184697e-14
184 6.845388e-10 2 4 -3 # 6.51510725773e-14
185 3.653681e-11 2 4 -1 # 3.47739597902e-15
186 3.628565e-12 2 14 -13 # 3.45349104696e-16
187 3.210853e-13 2 12 -11 # 3.05593330057e-17
188 2.312273e-13 2 2 -3 # 2.20070912426e-17
189 1.345558e-14 2 2 -1 # 1.28063629378e-18
190 4.448544e-19 2 22 24 # 4.23390780423e-23
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- Olivier Mattelaer
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