definition of observable
Hi
I use mg5 to compute p p > t t~ w+ [QCD] matching to Parton Shower.
I find there is MET in ma5, and in the literature (1206.1599 Eq.(1) and 1405.3982 Eq.(1)) it is define as, |sum_{i} pt_i |, where we sumover (scalar sum) all visible particles (correct me if I am wrong)
however, I want to plot missing transverse momentum (ptmiss), which is defined as the transverse momentum of the vector summation of invisible particles, i.e.,ptmiss = pt( ve[1]+ve[2]+vmu~[1] + all possible neutrino). has this observable already been implemented in ma5?
I tried "plot pt(invisible)" and "pt( ve[1] ve[2] vmux[1])" with "define ve = 12 -12" and "define vmux = -14 14". but all of them are empty histograms. so how to define neutrinos ?
how to define ptmiss
how can I define an observable pt(l[1]
i know i can define pt(l[1]
but i dont know how to define ptmiss and/or i dont know how to define a particle as ve[1]+ve[2]+vmu~[1]
I want to define an observable as min( M(mu[1] b[1]), M(mu[1] b[2]) ). so how to do that ?
thanks in advance
Huanyu
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