It is known that standard dipole showers yield incorrect subleading-colour contributions already at leading-logarithmic level for certain observables. In this talk, I will present two new, simple prescriptions to palliate this issue. I will show how the resulting colour-corrected matrix elements are cured at fixed order in the appropriate limits. I will then demonstrate how the two algorithms...
We present state-of-the-art predictions for the transverse momentum of
the colour singlet in gluon-fusion Higgs production and in neutral Drell-Yan
lepton-pair production, as well as the phistar observable in Drell Yan.
We resum such observables at N3LL’ accuracy in momentum space with the RadISH formalism, thus consistently including in our prediction all constant terms of relative order...
Jet grooming techniques have proved efficient in mitigating hadronization and pile-up effects in jet observable measurements at the LHC. We study the link between parton dynamics in the collinear limit and the logarithmically enhanced terms of the groomed jet mass distribution, for jets groomed with the modified mass-drop tagger (mMDT). While the leading-logarithmic (LL) result is linked to...
We present a new method to compute leading hadronisation corrections to two-jet event shapes in $e^+e^-$ annihilation. Interplay between perturbative and non-perturbative effects is accounted for with the ARES method.
We present a new formalism for the resummation of non-global QCD observables beyond leading-logarithmic accuracy. We describe the derivation of a set of integro-differential equations that govern the dynamics of soft radiation in the planar limit, using which we perform a fixed-order calculation of the out-of-jet energy and transverse energy distributions at lepton colliders. We finally...
In this talk, I will discuss the two-loop calculation of the bare next-to-leading power soft functions appearing in the Drell-Yan process in the threshold kinematics. These soft functions are the last missing ingredient needed to verify the next-to-leading power Drell-Yan factorization formula to NNLO. I will briefly review the derivation of the bare factorization theorem and introduce the...
High-precision all-order calculations can only be performed for a narrow class of observables, which are sensitive to radiation over the entire final state phase-space. When phase-space boundaries are introduced, the resummation is affected by so-called non-global logarithms, which have an intricate all-order structure. In this talk, we present a first-principle calculation for the...
We present a systematic investigation of parton-shower and matching uncertainties of perturbative origin for Higgs-boson production via vector-boson fusion. To this end we employ different generators at next-to-leading order QCD accuracy matched with shower Monte Carlo programs, $\texttt{PYTHIA8}$, and $\texttt{HERWIG7}$, and a next-to-next-to-leading order QCD calculation.
We thoroughly...
The parton branching (PB) method is recently developed for the evolution of transverse momentum dependent (TMD) parton distributions to be used within Monte Carlo calculations. With PB TMDs, soft-gluon resummation is fulfilled and a mismatch in the treatment of transverse momentum in MC event generators can be avoided. In this talk I show PB TMD results for Drell-Yan transverse momentum...
