<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Dear All, <div class=""><br class=""></div><div class="">Here is a reminder of the theory seminar tomorrow:<br class=""><div><br class=""></div>Monday, November 26th, 1:00PM, Room L102,<br class="">Yacine Mehtar-Tani (BNL), "Sudakov suppression of jets in dense QCD matter"<br class="">BlueJeans connection: <a href="https://bluejeans.com/321085255" class="">https://bluejeans.com/321085255</a><br class=""><br class="">Abstract<br class="">The phenomenon of jet quenching in ultra-relativistic heavy ion collisions reveals the effect of substantial final state interactions that cause QCD jets to lose energy to the quark-gluon plasma (QGP), mainly by induced gluon radiation. In standard analytic approaches to energy loss, jets are approximated by single partons and thus higher-order effects in the strong coupling constant are neglected. This may prove insufficient to reliably extract QGP properties at high pT, where a significant jet suppression was recently reported by the ATLAS collaboration in PbPb collisions at the LHC. In this work we explore higher-order contributions to the inclusive jet spectrum which may be sizable owing to the fact that the probability for a highly virtual parton to split in the medium increases with the jet pT. As the effective number of jet constituents increases, jets are expected to lose more energy than a single color charge. This translates into a logarithmic enhancement of higher!<br class="">-orders in the perturbative series that need to be resummed. As a result we obtain a Sudakov-like suppression factor which we investigate in the leading logarithmic approximation. We note, however, that the phase space for higher-order corrections is mitigated by coherence effects that relate to the fact that, below a characteristic angular scale, the medium does not resolve the inner jet structure. In this case, the jet lose energy coherently as a single color charge, namely, the primary parton.<br class=""></div><div class=""><br class=""></div><div class="">Thank you.</div><div class="">-Carlota, Vincent & Raza</div></body></html>