Research team
Expertise
My main field of interest is the proton structure. Since my bachelor studies I’ve been working on phenomenology of Quantum Chromodynamics (QCD), which describes the interactions between quarks and gluons- the ingredients of proton, called collectively as partons. The precise knowledge of so called parton distribution functions (PDFs) is the key ingredient to obtain accurate QCD predictions for collider processes. Standard PDFs describe the structure of proton in the longitudinal direction only. However, for some observables it is not enough and also the transverse degrees of freedom have to be taken into account to describe the data. My work is devoted to the determination of the transverse momentum dependent (TMD) PDFs. The topic of my PhD, which I did at DESY under the supervision of Hannes Jung, was the development of the Parton Branching (PB) method. We constructed and provided a Monte Carlo solution of the evolution equation for the TMD PDFs. The method can be viewed as an extension of DGLAP evolution equation, where not only the longitudinal, but also the transverse momentum is calculated at each branching. Currently, I am a post doc in the particle physics group at the University of Antwerp. I belong to the TMD team lead by Francesco Hautmann. Together we are working on further developments and extensions of the PB method. We investigate also the connections between PB and other approaches. We apply our formalism to the Large Hadron Collider measurements.
Beyond Collinear Factorization: Precision Measurement Era with Predictions from the Parton Branching TMDs.
Abstract
Precision measurements have a prominent position at the Large Hadron Collider (LHC) as well as in the new accelerators' physics program and they relay on accurate theoretical predictions. In this proposal, a new way of obtaining predictions, the Parton Branching (PB) method, is discussed. The method, based on transverse momentum dependent (TMD) factorization theorem, aims in applicability to exclusive collider observables in a wide kinematic range. The basic element of cross sections calculations are parton distribution functions (PDFs). In contrast to the widely used collinear approach, the PB does not neglect the 3-dimensional structure of proton: the TMD PDFs (TMDs) are determined thanks to exact kinematic calculation. In this project outline an extensive theory program is proposed to establish connection between the PB and other approaches and to push the PB accuracy from next-to-leading logarithmic approximation to next-to-next-to-leading. The possibility of including small x together with small qt resummation within one approach by using TMD splitting functions will be investigated. The outcome of the project will be a big step forward in a common understanding of the TMD factorization and resummation. The theory developments will result in the new TMDs fit procedure within xFitter package, improved by incorporating the Drell-Yan data. The new TMDs will be used to obtain precise predictions for the crucial DY precision measurements at Run III and High Luminosity LHC.Researcher(s)
- Promoter: Van Mechelen Pierre
- Co-promoter: Hautmann Francesco
- Fellow: Lelek Aleksandra
Research team(s)
Project type(s)
- Research Project