Cross-section stability
Dear Olivier,
I am using MG-v2.9.5 to generate events of some processes at the partonic level. I have a question regarding the stability of pp > tt~gg cross-section, with t t~ decaying semi-leptonically (pp > gg t t~> \mu+ \mu- b b~ gg \vm \vm~).
when the cuts are not applied at the partonic level, the cross-section is supposed to be not stable, and yet it is stable.
All the cuts are set to -1 in the run card :
\sigma(pp > jjtt~ > mu+ mu- b b~ j j \vm \vm~) = 8x10^17 + 6.5x10^17 pb
\sigma(pp > ggtt~ > mu+ mu- b b~ j j \vm \vm~ ) = 2.93+0.0091 pb !!
15.0 = bwcutoff;
run.log file associated to a subprocess of pp > ggtt~ > mu+ mu- b b~ j j \vm \vm~:
Particle 3 4 5 6 7 8 9 10
Et > 20.0 20.0 0.0 0.0 0.0 0.0 0.0 0.0
E > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Eta < 5.0 5.0 -1.0 -1.0 -1.0 -1.0 -1.0 -1.0
xqcut: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
d R # 3 > -0.0 0.4 0.0 0.0 0.0 0.0 0.0 0.0
d R # 4 > -0.0 -0.0 0.0 0.0 0.0 0.0 0.0 0.0
d R # 5 > -0.0 -0.0 -0.0 0.0 0.0 0.0 0.0 0.0
d R # 6 > -0.0 -0.0 -0.0 -0.0 0.0 0.0 0.0 0.0
d R # 7 > -0.0 -0.0 -0.0 -0.0 -0.0 0.0 0.0 0.0
d R # 8 > -0.0 -0.0 -0.0 -0.0 -0.0 -0.0 0.0 0.0
d R # 9 > -0.0 -0.0 -0.0 -0.0 -0.0 -0.0 -0.0 0.0
s min # 3> 0.0 0.0 0.0 0.0 22.1 0.0 0.0 0.0
s min # 4> 0.0 0.0 0.0 0.0 22.1 0.0 0.0 0.0
s min # 5> 0.0 0.0 0.0 0.0 22.1 0.0 0.0 0.0
s min # 6> 0.0 0.0 0.0 0.0 22.1 0.0 0.0 0.0
s min # 7> 0.0 0.0 0.0 0.0 0.0 22.1 22.1 0.0
s min # 8> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
s min # 9> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
xqcutij # 3> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
xqcutij # 4> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
xqcutij # 5> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
xqcutij # 6> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
xqcutij # 7> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
xqcutij # 8> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
xqcutij # 9> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
No cut BW -1 1
No cut BW -2 2
No cut BW -3 3
No cut BW -4 4
some values are not set to -1, although the cuts are set to -1 at the run card.
run.log file associated to a subprocess of pp > jjtt~ > mu+ mu- b b~ j j \vm \vm~:
Particle 3 4 5 6 7 8 9 10
Et > -1.0 -1.0 0.0 0.0 0.0 0.0 0.0 0.0
E > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Eta < -1.0 -1.0 -1.0 -1.0 -1.0 -1.0 -1.0 -1.0
xqcut: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
d R # 3 > -0.0 -1.0 0.0 0.0 0.0 0.0 0.0 0.0
d R # 4 > -0.0 -0.0 0.0 0.0 0.0 0.0 0.0 0.0
d R # 5 > -0.0 -0.0 -0.0 0.0 0.0 0.0 0.0 0.0
d R # 6 > -0.0 -0.0 -0.0 -0.0 0.0 0.0 0.0 0.0
d R # 7 > -0.0 -0.0 -0.0 -0.0 -0.0 0.0 0.0 0.0
d R # 8 > -0.0 -0.0 -0.0 -0.0 -0.0 -0.0 0.0 0.0
d R # 9 > -0.0 -0.0 -0.0 -0.0 -0.0 -0.0 -0.0 0.0
s min # 3> 0.0 0.0 0.0 0.0 22.1 0.0 0.0 0.0
s min # 4> 0.0 0.0 0.0 0.0 22.1 0.0 0.0 0.0
s min # 5> 0.0 0.0 0.0 0.0 22.1 0.0 0.0 0.0
s min # 6> 0.0 0.0 0.0 0.0 22.1 0.0 0.0 0.0
s min # 7> 0.0 0.0 0.0 0.0 0.0 22.1 22.1 0.0
s min # 8> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
s min # 9> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
xqcutij # 3> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
xqcutij # 4> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
xqcutij # 5> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
xqcutij # 6> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
xqcutij # 7> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
xqcutij # 8> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
xqcutij # 9> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
No cut BW -1 1
No cut BW -2 2
No cut BW -3 3
No cut BW -4 4
Many thanks for any help or any suggestion to alleviate the confusion.
Best regards
Souad
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