Resummed event shapes at hadron colliders

We present recently defined jet-observables for hadron-hadron dijet production, which are designed to reconcile the seemingly conflicting theoretical requirement of globalness, which makes it possible to resum them (automatically) at NLL accuracy and the limited experimental reach of detectors, so that they are measurable at the Tevatron and at the LHC.Comment: 7 pages, Talk given at the XXXIV International Symposium on Multiparticle Dynamics, Sonoma, July 26 - August 1, 200

Effective theory approach to unstable particles

We present a novel treatment of resonant massive particles appearing as intermediate states in high energy collisions. The approach uses effective field theory methods to treat consistently the instability of the intermediate resonant state. As a result gauge invariance is respected in every step and calculations can in principle be extended to all orders in perturbation theory, the only practical limitation in going to higher orders being the standard difficulties related to multi-loop integrals. We believe that the longstanding problem related to the treatment of instability of particles is now solved.Comment: 6 pages, 2 figures, uses moriond.sty (included). Talk presented at the XXXIXth Rencontres de Moriond on Electroweak and Unified Interactions, La Thuille, Italy, March 21-28 200

QCD and High Energy Interactions: Moriond 2015 Theory Summary

I will summarise the new theory developments that emerged during the 2015 QCD Moriond conference. I will give my perspective on some of the topics and emphasise what I consider most relevant.Comment: 15 pages, 8 figure

W+W-, WZ and ZZ production in the POWHEG BOX V2

We present an implementation of the vector boson pair production processes ZZ, W+W- and WZ within the POWHEG BOX V2. This implementation, derived from the POWHEG BOX version, has several improvements over the old one, among which the inclusion of all decay modes of the vector bosons, the possibility to generate different decay modes in the same run, speed optimization and phase space improvements in the handling of interference and singly resonant contributions.Comment: 4 pages, v2 corrects one referenc

W+3 jet production at the LHC as a signal or background

We discuss the production of W bosons in association with three jets at the LHC. We investigate how next-to-leading order QCD corrections modify basic kinematic distributions of jets and leptons. We also address the magnitude of NLO QCD effects in W+3 jet observables, relevant for SUSY searches at the LHC.Comment: 10 pages, 13 figures, OUTP-09-26-