CalcHEP

Is it possible to put missing energy cut and H_T cut in CalcHEP?

Asked by Basabendu

I am running a batch file with some BSM particles in CalcHEP. Now, I want to put missing E_T cut and H_T cut (i.e, scalar sum over jet p_T) . How can I do that in the batch file?

Thank you.

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Alexander Belyaev
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Best Alexander Belyaev (alexander.belyaev) said : 		#1

Dear Basabendu,

1. for missing E_T cut or for E_T for one or more particle, we have "Z" variable
which can be used for missing E_T

for example id you study

p,p->DM,DM,jet
where DM is your Dark Matter particle
then Z(DM,DM) == E_T of DM pair -- exactly what do you need

2. for scalar sum of P_T there is no defined variable yet,
so you can use

$CALCHEP/utile/usrfun.c
function to define new variable,
see manual or paper for this
https://arxiv.org/pdf/1207.6082.pdf
section 4.5

In the near future we will have "+" modifier for the scalar sum
in CalcHEP
so after this update, the
 T+(jet)
will work for you.
Alexander Pukhov will implement this shortly into CalcHEP.

Regards,
Alexander Belyaev

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Basabendu (bb1988-1) said : 		#2

Thanks Alexander Belyaev, that solved my question.