WHIZARD

Simulating HHnunu, HH -> bbWW, WW->qqqq

Asked by Jason Oliver

Hi,

I want to simulate

e+e- > H, H, nue,nuebar
with one Higgs decaying to b,bbar and the other decaying to a W and off shell W, with both of those decaying to q qbar, q qbar.

I am able to simulate the process where both Higgs decay to b bar, but not this example.

I followed a previous example of this, but I am unsure how I would write a SINDARIN card to decay one Higgs one way, and another Higgs another. As well as this, I am unsure how to specify a particle decays into an off shell particle.

Any and all guidance on this is greatly appreciated,

Kind regards,

Jason

Question information

Language:
English Edit question
Status:
Solved
For:
WHIZARD Edit question
Assignee:
Juergen Reuter Edit question
Last query:
Last reply:
Revision history for this message
Juergen Reuter (j.r.reuter) said : 		#1

Hi Jason,
let me first put a few remarks: it is not possible to specify an off-shell decay, you would have to specify it as a three-body decay, H->Wjj. Next, (I have to come back with info from the full team) I think for identical particles you have to specify the two possible
decays, here e.g.
alias j = u:U:d:D:s:S:c:C
process hbb = H => b, bbar
process hwjj = H => Wp:Wm, j, j
unstable H (hbb,hwjj)
This will give you an event sample with branching ratios according to the ratio of the two partial widths (or according to a preset branching ratio). by the latter, in principle you can make them 50% each.
There is also the possibility to specify full processes like e.g.
process eevvbb4j = e1, E1 => nue, nuebar, b, bbar, j, j, j, j
and then set restrictions on the final state, e.g.
{ $restrictions = "5+6~ H && 7+8+9+10 ~ H" } etc.

Revision history for this message
Juergen Reuter (j.r.reuter) said : 		#2

Do you need any further help with me, or can we mark this as solved?

Revision history for this message
Juergen Reuter (j.r.reuter) said : 		#3

As we haven't heard back, we'll change the status into solved. Please feel free to reopen in case of additional questions or file a new question.