[Rivet] W finder and PartonJet question

[kristin Lohwasser]

Dear all,

I have a (couple of) question(s) concerning the WFinder implementation 
in Rivet and how to get Parton Jets in Rivet (is this possible at all?).

Essentially I want to get BORN level electrons, for this I am using the 
WFinder (since as I understand, this is the recommended way to 
reconstruct W's in Rivet -- please correct me, if I am wrong)

1) CLUSTERING DEFINITION
--> For Born level I am not sure, what setting for the Photon clustering 
to use, essentially for the below settings, the WFinder::NOCLUSTER and 
WFinder::CLUSTERNODECAY yield the same results (but these are different 
from my cross check numbers for Born level)
       WFinder wfinder_born_el(fs, -2.5, 2.5, 20*GeV, PID::ELECTRON, 
0*GeV, 8000*GeV, 25*GeV, 0.2, WFinder::NOCLUSTER    );
so I am not sure, whether any of the ENUMS will actually selec W-Born level.

2) Difference for MET
I understand, you set the MET cut in the WFinder Declaration (25*GeV in 
the above case).
However, I apply a MT cut afterwards as well and there I also doublely 
applied the MET cut -- however when I *REMOVED* it, the number of 
selected events *CHANGED*, which should not happen (code follows now):


       if (!wfinder_born_mu.particles().empty()) {
         const FourMomentum& nu = 
wfinder_born_el.constituentNeutrinos()[0].momentum();
         if ( calcMT(nu, 
wfinder_born_el.constituentLeptons()[0].momentum())  > 40*GeV && 
nu.pT()>25*GeV) {
           keepevent=true;
}}

       if (!keepevent) {
         MSG_DEBUG("event does not pass mT and MET cuts");
         vetoEvent;
       }
COUNT_PASS_W++;

3) How can want one get Parton Jets in Rivet? I tried to find some other 
analysis using this, e.g. ATLAS jets, but it seems, they are not 
implemented. It would be great, if you could suggest me something.

Thanks & Best
Kristin





-- 
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Dr. Kristin Lohwasser

DESY
Zeuthen
Raum: 3L-022
Telefon +49 33762 7-7647
Platanenallee 6
D-15738 Zeuthen
Deutschland

Kristin.Lohwasser at cern.ch
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