MadGraph5_aMC@NLO

EVA, Zero result detected: No Phase Space. Please check particle masses.

Asked by Si Wang

Hi,

I was running the process in 2HDM as:
define vxp = w+ z a
define vxm = w- z a
generate vxp vxm > h+ h-

then I launched the process as:
set lpp1 -4
set lpp2 4
set pdlabel eva
set ebeam1 5000
set ebeam2 5000
set mass 25 125
set mass 35 2000
set mass 36 2000
set mass 37 2000

But I got zero cross section.
It shows: Zero result detected: No Phase Space. Please check particle masses.

But if the mass of 35,36,37 are 1000 GeV, it works fine.
What is the reason?
Thank you!
Si

Question information

Language:
English Edit question
Status:
Solved
For:
MadGraph5_aMC@NLO Edit question
Assignee:
No assignee Edit question
Solved by:
Si Wang
Solved:
Last query:
Last reply:
Revision history for this message
Si Wang (siw34) said : 		#1

Hi,

I found out the reason.
For initially in the h+h-.mg5 file, the each beam energy is 1500 GeV. Later I ran the shell script.
I don't know the reason, this initial beam energy limited the Higgs mass.
I changed the initial mg5 file beam energy to 15 TeV, now it works fine.

Thank you!
Si