<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Dear Rivet developers, Andy et al<div class=""><br class=""></div><div class="">in the LHC EW working group on jets and vector-bosons we are starting</div><div class="">to compare measurements from the different LHC experiments to see,</div><div class="">whether the measurements are consistent. </div><div class="">We start just doing a comparison using the Rivet plugins with one or two</div><div class="">well defined theory calculation.</div><div class=""><br class=""></div><div class="">At the moment, the experimental uncertainties (stat and syst) in Rivet are </div><div class="">treated as uncorrelated uncertainties, while for a detailed comparison with theory </div><div class="">also the correlations and the different correlated systematic uncertainties</div><div class="">should be treated.</div><div class=""><br class=""></div><div class="">Is there already some discussion under the Rivet developers, to include those</div><div class="">uncertainties, or if not, would you be interested to join the discussion in our</div><div class="">working group on how to consistently define the correlation matrices between the</div><div class="">experiments, such that they can be used also within Rivet ?</div><div class=""><br class=""></div><div class="">We will have a first meeting of the Jets + Bosons WG on Friday, tomorrow:</div><div class=""><br class=""></div><div class=""><a href="https://indico.cern.ch/event/721044/" class="">https://indico.cern.ch/event/721044/</a></div><div class=""><br class=""></div><div class="">Your participation would be very welcome </div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Best</div><div class=""><br class=""></div><div class="">Hannes</div><div class=""><br class=""></div><div class=""><div class=""> <span class="Apple-style-span" style="border-collapse: separate; 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"><div class="">Hannes Jung </div><div class="">Email: <a href="mailto:Hannes.Jung@desy.de" class="">Hannes.Jung@desy.de</a> </div><div class="">mobile :+49 40 8998 93741</div><div class=""><a href="http://www.desy.de/~jung" class="">http://www.desy.de/~jung</a> </div><div class="">Tel: +49 (0) 40 8998 3741 </div><div class="">Fax: +49 (0) 40 8994 3741</div></span></div></div></span><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; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; " class=""><div class=""><span class="Apple-style-span" style="font-size: 12px; 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