<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Dear Leif et al<div class=""><br class=""></div><div class="">in DIS analyses in H1 we normally corrected for QED radiation, so the quoted xsections are</div><div class="">after the correction.</div><div class="">If you need detailed infos, just let me know which analysis you are concerned with and I can try to</div><div class="">dig out more infos ... </div><div class=""><br class=""></div><div class="">Cheers</div><div class="">hannes</div><div class=""><br class=""></div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 17. Nov 2017, at 11:10, Leif Lönnblad <<a href="mailto:leif.lonnblad@thep.lu.se" class="">leif.lonnblad@thep.lu.se</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">On 2017-11-16 12:26, David Grellscheid wrote:<br class=""><blockquote type="cite" class="">please accept my apologies on behalf of the Rivet authors for this<br class="">email. This is not an appropriate response to your question<br class=""></blockquote><br class="">I certainly agree with this! The tone in that letter was completely out of line.<br class=""><br class="">On 2017-11-16 16:23, Andy Buckley wrote:<br class=""><blockquote type="cite" class="">My reading of the Rivet 2.5.3 code (copied below) is that it selects<br class="">the highest-|pz| final-state lepton. Looking back through my emails I<br class="">see that Andrii's concern about a final-state definition was actually<br class="">about using highest-pT, i.e. not the same thing. DIS experts, is<br class="">max-|pz| a reasonable heuristic?<br class=""></blockquote><br class="">Reading old H1 papers it seems their definition of the DIS kinematics is based on their BEMC detector, which covers polar angles between 151 and 177 degrees (wrt. the proton direction), and the scattered electron is taken "as the most energetic BEMC cluster" with energy larger than 14 GeV. A rather simple experimental definition.<br class=""><br class="">However, looking at the old HZtool routines, they always use the generator definition. It's not clear to me if they generally correct for this in any way. I saw one statement where they have studied QED corrections and get effects of order 5% which they then include in the systematic uncertainties, but do not correct for.<br class=""><br class="">My guess is that any reasonable definition would do, and that the original maximum-pz was reasonable, as is the generator definition. I would, of course, prefer the the experimental definition, but it should be easy to see what the differences are.<br class=""><br class="">/Leif<br class=""><br class=""><br class="">-- <br class="">Leif Lönnblad<br class="">Department of Astronomy and Theoretical Physics<br class="">Sölvegatan 14A, S-223 62 Lund, Sweden<br class="">phone: +46-46 2227780, fax: +46-46 2229686<br class="">e-mail: <<a href="mailto:Leif.Lonnblad@thep.lu.se" class="">Leif.Lonnblad@thep.lu.se</a>><br class="">_______________________________________________<br class="">Rivet mailing list<br class=""><a href="mailto:Rivet@projects.hepforge.org" class="">Rivet@projects.hepforge.org</a><br class="">https://www.hepforge.org/lists/listinfo/rivet</div></div></blockquote></div><br class=""><div class=""> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; 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