Workshop on Resummation, Evolution, Factorization (REF 2019)

Session

Thursday 1

Nov 28, 2019, 9:00 AM

Aula Foscolo (University of Pavia)

Conveners

Thursday 1

• Miguel Echevarria (INFN Pavia)

43. Azimuthal asymmetries in SIDIS and Drell-Yan processes: from high to low transverse momentum

Cristian Pisano (CA)

11/28/19, 9:00 AM

We consider the azimuthal distribution of the final observed hadron in semi-inclusive deep-inelastic scattering and the lepton pair in the Drell-Yan process. In particular, we focus on the cosϕ modulation of the unpolarized cross section and on its dependence upon transverse momentum. At low transverse momentum, for these observables we propose a factorized expression based on tree-level...

36. TMDs and DPDs on the lattice

Andreas Schafer (Regensburg University)

11/28/19, 9:30 AM

While the investigation of TMDs is a major objective of the EIC, Double Parton Ditributions (DPDs) are crucial for a first principle QCD description of double parton interactions at LHC, which contribute to the standard model background for various BSM searches. Both groups of functions are genuinely non-collinear and non-perturbative. The non-collinearity required the development of new...

56. Quasi-TMDPDFs and the Collins-Soper Kernel

Prof. Iain Stewart (MIT)

11/28/19, 10:00 AM

In this talk I will discuss the concept of quasi-TMDPDFs, which are transverse momentum dependent parton distribution functions defined with operators on a spatial (equal-time) slice. These distributions must be defined so that they have the same infrared physics as the standard TMDPDF, but can be directly calculated with Lattice QCD. As a nice application, I discuss our proposal for using...

62. Conformal invariance of TMD rapidity evolution

Giovanni Antonio Chirilli (University of Regensburg)

11/28/19, 10:30 AM

Abstract: The most known scheme to regulate the rapidity/UV divergences of the Transverse Momentum Distribution operators due to the infinite light-like gauge links is the Collis Soper Sterman formalism or the Soft Collinear Effective Theory formalism. An alternative choice is provided by the scheme used in the small-x physics. The corresponding evolution equations differ already at leading...