Speaker
Andrea Banfi
(University of Sussex)
Description
When performing resummation of global rIRC safe observables, it is often assumed that gluons at wide angles feel the total colour charge of collinear particles. We show that this is not the case for one-jettiness, an observable which was believed to enjoy an all-order factorisation formula. In fact, due to the presence of Coulomb gluons, one-jettiness exhibits super-super-leading logarithms, a new class of coherence-violating contributions, one log higher than super-leading logarithms affecting gaps between jets.
Author
Andrea Banfi
(University of Sussex)