Workshop on Resummation, Evolution, Factorization (REF 2019)

Sessione

Wednesday 1

27 nov 2019, 09:00

Aula Foscolo (University of Pavia)

Coordinatori

Wednesday 1

• Ignazio Scimemi (Universidad Complutense Madrid)

61. Prospects for measurements of H/Z production cross section ra-tios using CMS Run II data

Louis Moureaux (IIHE-ULB)

27/11/19, 09:00

We present prospects for the direct measurement of ratios of differential cross sections for the production of Z and Higgs bosons in proton-proton collisions, using data taken by CMS during the LHC Run II. The aim of the measurement is to study soft and hard gluon emission in the initial statefor Higgs and Z production mechanisms. Hence, we focus on variables known to be sensitive to the...

44. Combining QED and QCD transverse-momentum resummation for vector boson production at hadron colliders

Giancarlo Ferrera (MI)

27/11/19, 09:30

We consider the transverse-momentum (qT) distribution of Z bosons produced in hadronic collisions. At small values of qT, we perform the analytic resummation of the logarithmically enhanced QED contributions up to next-to-leading logarithmic accuracy, including the mixed QCD-QED contributions at leading logarithmic accuracy. Resummed results are consistently matched with the next-to-leading...

66. The qT-subtraction formalism at N3LO

Leandro Javier Cieri (Istituto Nazionale di Fisica Nucleare - Sez. Milano Bicocca)

27/11/19, 10:00

In this talk we will show the necessary ingredients of a N3LO perturbative QCD calculation using the qT-subtraction prescription. We will show which are the partially known (or missing) coefficients at the third order in the strong coupling and how we can circumvent this problem using the total cross section at the same perturbative order. We will apply this formalism to the particular case of...

57. Factorisation tools for infrared subtraction beyond NLO

Lorenzo Magnea (TO)

27/11/19, 10:30

I will review some recent work on the infrared subtraction problem beyond NLO, focusing in particular on the general definition of local subtraction counterterms. The starting point is the infrared factorisation of virtual corrections to fixed-angle scattering amplitudes in massless gauge theories, which can be used to define local soft and collinear counterterms in terms of matrix elements of...