Workshop on Resummation, Evolution, Factorization (REF 2019)

Session

Friday 1

29 Nov 2019, 09:00

Aula Foscolo (University of Pavia)

Conveners

Friday 1

• Marco Radici (PV)

51. New developments in the PROSA PDF fit

Maria Vittoria Garzelli (Universita' degli Studi di Firenze & Tuebingen Universitaet)

29/11/2019, 09:00

The PROSA PDF fit was the first in the literature showing the impact of the inclusion of open-heavy flavour production data on low-x gluons.
We present a new version of the fit, including a more extended set of experimental data than our previous fit, which allows to better constrain gluon and sea quark distributions and we show its performances in applications of interest for neutrino astronomy.

23. Small-x resummation and its impact in PDF determination

Marco Bonvini (ROMA1)

29/11/2019, 09:30

I will consider the resummation of logarithms of the momentum scaling variable x, which become large at small momentum fractions, namely at high energies. I will cover recent developments in the field, which led to the first PDF fits including small-x resummation. I will discuss the effects on PDF determination, and the implications for present and future collider phenomenology.

39. A model calculation of the transverse-momentum-dependent gluon density in the proton

Francesco Giovanni Celiberto (University of Pavia and INFN)

29/11/2019, 10:00

While significant steps toward the formal definition of quark TMDs and their extraction from experimental data through global fits has been made in the last years, the gluon-TMD field represents a largely unexplored territory. Pursuing the goal of extendending our knowledge of this sector, we present analytic expressions for all $T$-even gluon TMDs at twist-2, calculated in a spectator model...

20. Wilson-line geometries and the relation between IR singularities of form factors and the large-x limit of DGLAP splitting functions

Calum Milloy (University of Edinburgh)

29/11/2019, 10:30

We discuss the relation between the infrared singularities of on-shell partonic form factors and parton distribution functions (PDFs) near the elastic limit, through their factorisation in terms of Wilson-line correlators. Ultimately we identify the difference between the anomalous dimension controlling single poles of these two quantities to all loops in terms of the closed parallelogram...

45. Helicity-dependent generalization of the JIMWLK evolution

Florian Cougoulic (The Ohio State University)

29/11/2019, 11:00

The small-x evolution equations for the quark and gluon helicity distribution have recently been constructed by finding sub-eikonal corrections to the eikonal shock wave formalism. Those equations are written for correlators of infinite light-cone Wilson lines along with the so-called polarized Wilson lines. Those equations close in the large $N_c$-limit ($N_c$ is the number of quark colors),...