different me_frame gave different XS in VBS Same-sign WW
Dear MadGraph experts,
I am using MG5 v2.7.0 to simulate VBS same-sign WW process. I test the me_frame this time.
I run two processes, they have same proc_card_mg5.dat:
set default_
set group_subprocesses Auto
set ignore_
set loop_optimized_
set loop_color_flows False
set gauge unitary
set complex_mass_scheme False
set max_npoint_
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 sm-ckm_no_b_mass
define p = 21 2 4 1 3 -2 -4 -1 -3 5 -5
define p = g u c d s b u~ c~ d~ s~ b~
define j = p
define l+ = e+ mu+
define l- = e- mu-
define vl = ve vm
define vl~ = ve~ vm~
generate p p > w+{0} w+{0} j j QED=4 QCD=0
output vbs_wpwp_ll2
For their run_card.dat, the only difference is one of them uses '1,2 = me_frame' (vbs_wpwp_ll), the other one uses '3,4 = me_frame' (vbs_wpwp_ll2), other settings are same as this page:
https:/
I got different XS:
XS(vbs_wpwp_ll): 0.009639 ± 7.3e-05 pb
XS(vbs_wpwp_ll2): 0.01476 ± 0.00012 pb
Does someone know the reason why? Because from this paper: https:/
Thanks,
Jie
Question information
- Language:
- English Edit question
- Status:
- Answered
- Assignee:
- No assignee Edit question
- Last query:
- Last reply:
Can you help with this problem?
Provide an answer of your own, or ask xiao jie for more information if necessary.