<div dir="ltr"><div class="gmail_default" style="font-size:large">Hi Raquel,</div><div class="gmail_default" style="font-size:large"><br></div><div class="gmail_default" style="font-size:large">You can convert the LHE files direct to HepMC, but it is a hack. Also, there are of course physics effects in the shower, hadronisation, etc. which might be important for your results -- unless you have a good reason not to, I would shower them. This will also make life easier since Rivet's ZFinder reconstructs Zs from lepton pairs (you have to do something else if you have hadronically decaying bosons), and is generally oriented around the idea of doing physics analysis from a "realistic" set of final state particles.</div><div class="gmail_default" style="font-size:large"><br></div><div class="gmail_default" style="font-size:large">When showering, you will need to match the shower to your 2-jet final state: in fact, in general you<span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:large;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">r final-state topology will receive contributions from Z Z + 2 shower-jets and Z Z j + 1 shower-jet, so unless you are placing analysis cuts on the jets which would eliminate these contributions you should also be telling MadGraph to make and merge those different matrix elements.</span></div><div class="gmail_default" style="font-size:large"><br></div><div class="gmail_default" style="font-size:large">Andy</div><div class="gmail_default" style="font-size:large"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 25 May 2018 at 16:38, GOMEZ-AMBROSIO, RAQUEL <span dir="ltr"><<a href="mailto:raquel.gomez-ambrosio@durham.ac.uk" target="_blank">raquel.gomez-ambrosio@durham.ac.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p style="margin-top:0;margin-bottom:0">Dear Andy, </p>
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<p style="margin-top:0;margin-bottom:0">I am Raquel, from IPPP, I am currently trying to use rivet for an analysis but I am a bit confused with the material I found. I wrote a Rivet analysis in the past, for CMS, and I liked it quite much, however now, trying
to use the same analysis for my own private MC productions is a bit more challenging. I just have 3 short questions:</p>
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<p style="margin-top:0;margin-bottom:0">1) My output files are lhe events from Madgraph. Can I just use this wrapper ouf yours (<a href="https://rivet.hepforge.org/hg/contrib/file/tip/lhef2hepmc/" class="m_-2797885997509940865OWAAutoLink" id="m_-2797885997509940865LPlnk345385" target="_blank">https://rivet.hepforge.org/<wbr>hg/contrib/file/tip/<wbr>lhef2hepmc/</a> ) to
transform them to hepmc, or is there some subtlety I should take into account?</p>
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<p style="margin-top:0;margin-bottom:0">2) I am studying resonant production of 2 Zs and hence my final state is Z Z j j . Is this Ok with Rivet? or I have to decay the Zs to leptons to be able to run the analysis? </p>
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<p style="margin-top:0;margin-bottom:0">3) I am not doing Parton shower either, but I could do if it was necessary. Is it? </p>
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<p style="margin-top:0;margin-bottom:0">thanks a lot</p><span class="HOEnZb"><font color="#888888">
<p style="margin-top:0;margin-bottom:0">Raquel </p>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature">Dr Andy Buckley, Lecturer / Royal Society University Research Fellow<br>Particle Physics Expt Group, University of Glasgow<br></div>
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