<html><body><div style="color:#000; background-color:#fff; font-family:verdana, helvetica, sans-serif;font-size:13px"><div id="yui_3_16_0_1_1434003159124_45290"><span id="yui_3_16_0_1_1434003159124_45662">Dear Frank,</span></div><div id="yui_3_16_0_1_1434003159124_45290"><span><br></span></div><div id="yui_3_16_0_1_1434003159124_45290"><span id="yui_3_16_0_1_1434003159124_45636">After I set the cone size of ZFinder = 0.0</span></div><div id="yui_3_16_0_1_1434003159124_45290"><span><br></span></div><div id="yui_3_16_0_1_1434003159124_45290">
</div><div class="" dir="ltr" style="" id="yui_3_16_0_1_1434003159124_45703">       <span class="" style="">const</span> ZFinder zfe(fs, -<span class="" style="" id="yui_3_16_0_1_1434003159124_45713">2.5</span>, <span class="" style="" id="yui_3_16_0_1_1434003159124_45712">2.5</span>, <span class="" style="">0</span>*GeV, PID::ELECTRON, <span class="" style="">15</span>*GeV, <span class="" style="" id="yui_3_16_0_1_1434003159124_45702">1500</span>*GeV, <span class="" style="">0.0</span> );</div>  <div id="yui_3_16_0_1_1434003159124_45290" class="" style=""><span class="" style=""><br class="" style=""></span></div><div id="yui_3_16_0_1_1434003159124_45290" class="" style="" dir="ltr"><span class="" style="" id="yui_3_16_0_1_1434003159124_45930">I see my rivet result(red) is consistent with the post-FSR result(blue).</span></div><div id="yui_3_16_0_1_1434003159124_45290" class="" style="" dir="ltr"><span class="" style=""><br></span></div><div id="yui_3_16_0_1_1434003159124_45290" class="" style="" dir="ltr"><span class="" style="" id="yui_3_16_0_1_1434003159124_46006">Now I am asking the author their cone size for pre-FSR.</span></div><div id="yui_3_16_0_1_1434003159124_45290" class="" style="" dir="ltr"><span class="" style=""><br></span></div><div id="yui_3_16_0_1_1434003159124_45290" class="" style="" dir="ltr"><span class="" style="">Thanks.</span></div><div id="yui_3_16_0_1_1434003159124_45290" class="" style="" dir="ltr"><span class="" style=""><br></span></div><div id="yui_3_16_0_1_1434003159124_45290" class="" style="" dir="ltr"><span class="" style="">Yu-hsiang</span></div><div id="yui_3_16_0_1_1434003159124_45290" class="" style="" dir="ltr"><span class="" style=""><br></span></div><div id="yui_3_16_0_1_1434003159124_45290" class="" style="" dir="ltr"><span class="" style=""><br></span></div><div id="yui_3_16_0_1_1434003159124_45290" class="" style="" dir="ltr"><span class="" style=""><br></span></div><div id="yui_3_16_0_1_1434003159124_45290" class="" style="" dir="ltr"><span class="" style="">  </span></div><div id="yui_3_16_0_1_1434003159124_45290" class="" style=""><span class="" style=""><br></span></div><div id="yui_3_16_0_1_1434003159124_45290" class="" style=""><span class="" style=""><br></span></div><div id="yui_3_16_0_1_1434003159124_45290" class="" style=""><span class="" style=""><br></span></div><br><div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: verdana, helvetica, sans-serif; font-size: 13px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"> <font size="2" face="Arial"> Frank Siegert <frank.siegert@cern.ch> 於 2015/6/9 (週二) 7:03 PM 寫é“﹕<br> </font> </div>  <br><br> <div class="y_msg_container">Hi Yu-hsiang,<br clear="none"><br clear="none">the ZFinder object will (by default) use "dressed" leptons, which<br clear="none">means that photon radiation within a cone of dR=0.1 is included. This<br clear="none">is a generator independent and less QED-FSR-dependent definition,<br clear="none">which is neither pre-FSR (often called "Born" level leptons) nor<br clear="none">post-FSR (often called "bare" leptons). It does sum parts of the FSR<br clear="none">but not all of it (namely not the wide angle emissions). If you want<br clear="none">to use "bare" leptons for your comparison you would have to set dR=0.0<br clear="none">in the ZFinder constructor.<br clear="none"><br clear="none">If on the other hand you are writing a Rivet plugin for an actual<br clear="none">experimental measurement the question is what is the truth level to<br clear="none">which your analysis has been unfolded ("dressed", "Born" or "bare")?<br clear="none"><br clear="none">Cheers,<br clear="none">Frank<br clear="none"><br clear="none"><div class="yqt4377262833" id="yqtfd77654"><br clear="none">On 9 June 2015 at 12:14, Yu-hsiang Chang 張ç¥ç¥¥Â <<a shape="rect" ymailto="mailto:index0192@yahoo.com.tw" href="mailto:index0192@yahoo.com.tw">index0192@yahoo.com.tw</a>> wrote:<br clear="none">> Hi all,<br clear="none">><br clear="none">> I have question for the FinalState and the ZFinder in Rivet.<br clear="none">><br clear="none">> I want to know when I take the Z boson mass from the ZFinder, it is pre-FSR<br clear="none">> or post-FSR? (undergoes final state radiation(FSR) or not. In other words,<br clear="none">> does the 4-momentum of Z boson includes the energy and momentum of the FSR<br clear="none">> photon? )<br clear="none">><br clear="none">> For example, my Rivet plugin SMP_13_003.cc has these content :<br clear="none">><br clear="none">> ---------------------------------------------------<br clear="none">>     void init() {<br clear="none">><br clear="none">>       // Full final state<br clear="none">>        const FinalState fs(-5.0, 5.0);<br clear="none">>        addProjection(fs, "FS");<br clear="none">><br clear="none">>        // Z finders for muons<br clear="none">>        const ZFinder zfe(fs, -2.5, 2.5, 0*GeV, PID::ELECTRON, 15*GeV,<br clear="none">> 1500*GeV);<br clear="none">>        addProjection(zfe, "ZFE");<br clear="none">><br clear="none">> ......<br clear="none">>     }<br clear="none">><br clear="none">><br clear="none">>     void analyze(const Event& event) {<br clear="none">><br clear="none">>       const ParticleVector& z = zfe.bosons();<br clear="none">>       const double mass_z = z[0].mass();<br clear="none">><br clear="none">> ......<br clear="none">>     }<br clear="none">> ---------------------------------------------------<br clear="none">><br clear="none">> So I want to know the mass taken from the Z boson is pre-FSR or post-FSR?<br clear="none">><br clear="none">> Since I use the result of my rivet plugin (from YODA and then transform it<br clear="none">> to ROOT format),<br clear="none">> to compare with the pre-FSR and post-FSR mass of Z boson (generated by<br clear="none">> Powheg),<br clear="none">> and I find my rivet result is consistent to the pre-FSR instead of post-FSR.<br clear="none">> (previous one tell me that the FinalState object has already undergone the<br clear="none">> FSR,<br clear="none">> but since now I see inconsistent so I want to ask the part of ZFinder)<br clear="none">><br clear="none">> I put my rivet plugin (SMP_13_003.cc), and the comparison (snap shot ) in<br clear="none">> attachment.<br clear="none">> In comparison, the red point is the result of my rivet plugin, and the blue<br clear="none">> line is the pre-FSR or post-FSR.<br clear="none">><br clear="none">> Thanks.<br clear="none">><br clear="none">> Yu-hsiang</div><br clear="none">><br clear="none">><br clear="none">> _______________________________________________<br clear="none">> Rivet mailing list<br clear="none">> <a shape="rect" ymailto="mailto:Rivet@projects.hepforge.org" href="mailto:Rivet@projects.hepforge.org">Rivet@projects.hepforge.org</a><br clear="none">> <a shape="rect" href="https://www.hepforge.org/lists/listinfo/rivet" target="_blank">https://www.hepforge.org/lists/listinfo/rivet</a><br><br></div>  </div> </div>  </div></div></body></html>