<html><body><div style="color:#000; background-color:#fff; font-family:verdana, helvetica, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1434448611494_14110">Ok, thank Deepak and Andy.</div><div id="yui_3_16_0_1_1434448611494_14110"> </div><div id="yui_3_16_0_1_1434448611494_14110">Yu-hsiang</div> <div class="qtdSeparateBR"> </div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: verdana, helvetica, sans-serif; font-size: 16px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"> Andy Buckley <andy.buckley@cern.ch> 於 2015/6/16 (週二) 6:16 PM 寫道﹕ </div> <div class="y_msg_container">By default, photons from hadron decays (no matter how indirect) are excluded. Andy On 16/06/15 11:03, Yu-hsiang Chang 張祐祥 wrote: > Hi All, > > I have another question. When ZFinder want to include the photons' > energy and momentum (photon within the cone size that you set) to > leptons, does it consider the particle ID and particle's mother ID since > I don't want to include the photon which comes from Pion or other hadrons. > > Yu-hsiang > > > > > Yu-hsiang Chang 張祐祥 <<a shape="rect" ymailto="mailto:index0192@yahoo.com.tw" href="mailto:index0192@yahoo.com.tw">index0192@yahoo.com.tw</a>> 於 2015/6/11 (週四) 4:51 > PM 寫道﹕ > > > Dear Frank, > > After I set the cone size of ZFinder = 0.0 > > const ZFinder zfe(fs, -2.5, 2.5, 0*GeV, PID::ELECTRON, 15*GeV, > 1500*GeV, 0.0 ); > > I see my rivet result(red) is consistent with the post-FSR result(blue). > > Now I am asking the author their cone size for pre-FSR. > > Thanks. > > Yu-hsiang > > > > > > > > > > > Frank Siegert <<a shape="rect" ymailto="mailto:frank.siegert@cern.ch" href="mailto:frank.siegert@cern.ch">frank.siegert@cern.ch</a>> 於 2015/6/9 (週二) 7:03 PM 寫道﹕ > > > Hi Yu-hsiang, > > the ZFinder object will (by default) use "dressed" leptons, which > means that photon radiation within a cone of dR=0.1 is included. This > is a generator independent and less QED-FSR-dependent definition, > which is neither pre-FSR (often called "Born" level leptons) nor > post-FSR (often called "bare" leptons). It does sum parts of the FSR > but not all of it (namely not the wide angle emissions). If you want > to use "bare" leptons for your comparison you would have to set dR=0.0 > in the ZFinder constructor. > > If on the other hand you are writing a Rivet plugin for an actual > experimental measurement the question is what is the truth level to > which your analysis has been unfolded ("dressed", "Born" or "bare")? > > Cheers, > Frank > > > On 9 June 2015 at 12:14, Yu-hsiang Chang 張祐祥 <<a shape="rect" ymailto="mailto:index0192@yahoo.com.tw" href="mailto:index0192@yahoo.com.tw">index0192@yahoo.com.tw</a> > <mailto:<a shape="rect" ymailto="mailto:index0192@yahoo.com.tw" href="mailto:index0192@yahoo.com.tw">index0192@yahoo.com.tw</a>>> wrote: >> Hi all, >> >> I have question for the FinalState and the ZFinder in Rivet. >> >> I want to know when I take the Z boson mass from the ZFinder, it is > pre-FSR >> or post-FSR? (undergoes final state radiation(FSR) or not. In other words, >> does the 4-momentum of Z boson includes the energy and momentum of the FSR >> photon? ) >> >> For example, my Rivet plugin SMP_13_003.cc has these content : >> >> --------------------------------------------------- >> void init() { >> >> // Full final state >> const FinalState fs(-5.0, 5.0); >> addProjection(fs, "FS"); >> >> // Z finders for muons >> const ZFinder zfe(fs, -2.5, 2.5, 0*GeV, PID::ELECTRON, 15*GeV, >> 1500*GeV); >> addProjection(zfe, "ZFE"); >> >> ...... >> } >> >> >> void analyze(const Event& event) { >> >> const ParticleVector& z = zfe.bosons(); >> const double mass_z = z[0].mass(); >> >> ...... >> } >> --------------------------------------------------- >> >> So I want to know the mass taken from the Z boson is pre-FSR or post-FSR? >> >> Since I use the result of my rivet plugin (from YODA and then transform it >> to ROOT format), >> to compare with the pre-FSR and post-FSR mass of Z boson (generated by >> Powheg), >> and I find my rivet result is consistent to the pre-FSR instead of > post-FSR. >> (previous one tell me that the FinalState object has already undergone the >> FSR, >> but since now I see inconsistent so I want to ask the part of ZFinder) >> >> I put my rivet plugin (SMP_13_003.cc), and the comparison (snap shot ) in >> attachment. >> In comparison, the red point is the result of my rivet plugin, and the > blue >> line is the pre-FSR or post-FSR. >> >> Thanks. >> >> Yu-hsiang > >> >> >> _______________________________________________ >> Rivet mailing list >> <a shape="rect" ymailto="mailto:Rivet@projects.hepforge.org" href="mailto:Rivet@projects.hepforge.org">Rivet@projects.hepforge.org</a> <mailto:<a shape="rect" ymailto="mailto:Rivet@projects.hepforge.org" href="mailto:Rivet@projects.hepforge.org">Rivet@projects.hepforge.org</a>> >> <a shape="rect" href="https://www.hepforge.org/lists/listinfo/rivet" target="_blank">https://www.hepforge.org/lists/listinfo/rivet</a><div class="yqt6077888199" id="yqtfd71937"> > > > > > > _______________________________________________ > Rivet mailing list > <a shape="rect" ymailto="mailto:Rivet@projects.hepforge.org" href="mailto:Rivet@projects.hepforge.org">Rivet@projects.hepforge.org</a> > <a shape="rect" href="https://www.hepforge.org/lists/listinfo/rivet" target="_blank">https://www.hepforge.org/lists/listinfo/rivet</a></div> > -- Dr Andy Buckley, Lecturer / Royal Society University Research Fellow Particle Physics Expt Group, University of Glasgow<div class="yqt6077888199" id="yqtfd51868"> </div> </div> </div> </div> </div></div></body></html>