Theory in Manchester Bernadette Cogswell Fedor Bezrukov Mrinal

Theory in Manchester • Bernadette Cogswell, Fedor Bezrukov, Mrinal Dasgupta, Jeff Forshaw, Apostolos Pilaftsis, Mike Seymour • Daniele Anderle • 7 Ph. D students

Soft Gluons and More… Mike Seymour

This year… • • • Chief Examiner in Physics & Astronomy RESIGNED! Senior author of Herwig++ Scientist-in-Charge of MCnet. ITN FINISHED! Scientist-in-Charge of MCnet. ITN 3 PI for Lancaster-Manchester-Sheffield Consortium Consolidated Grant • STFC Review Panel of UK Particle Theory Mike Seymour Manchester Christmas meeting 3

MCnet School 2018 Mike Seymour Manchester Christmas meeting 4

MCnet projects g Glas ow Pythia+Vincia Herwig Sherpa Mad. Graph “Plugin” – Ariadne+HEJ CEDAR – Rivet+Professor +Contur+hepforge+…

Soft Gluons… Following JRF, MHS and Albrecht Kyrieleis 2006 discovery of super-leading logs in gaps between jets, Υ Q 0 Δy Δy Mike Seymour Manchester Christmas meeting 6

Soft Gluons… JRF, MHS and Andrzej Siodmok 2012 discovery that the same physics violates factorization in hadron-hadron collisions Mike Seymour Manchester Christmas meeting 7

Soft Gluons… JRF, MHS and René Angeles-Martinez 2015&16 formulation as an evolution in k_t Mike Seymour Manchester Christmas meeting 8

Soft Gluons… JRF, MHS needed new collaborators… Mike Seymour Manchester Christmas meeting 9

Soft Gluons… JRF, MHS needed new collaborators… Mike Seymour Manchester Christmas meeting 10

Soft Gluons… JRF, MHS needed new collaborators… • Numerical implementation of (non-probabilistic) Coulomb gluon exchange • To arbitrary accuracy in Nc • Equivalence with RGE and SCET approaches • Rederivation of Banfi-Marchesini-Smye equation • (also exact in Nc) Mike Seymour Manchester Christmas meeting 11

…and More Herwig 7. 1 released 2017 – Automated NLO matching (Powheg or MC@NLO style) – multi-jet merging at LO and NLO QCD – new model for soft interactions and diffraction – automated NLO top decay corrections Ongoing – New Herwig physics review paper • 2008, 1600 cites; 2001, 3000 cites; 1991, 2200 cites – NLO simulation of Higgs + jet -> Kiran – NLO simulation of top production -> Baptiste Mike Seymour Manchester Christmas meeting 12

Mike Seymour Manchester Christmas meeting 13