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## Researcher

# Aleksandra Lelek

- Research interest: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.

- Keywords:TRANSVERSE MOMENTUM DEPENDENT PDFS, PARTON DISTRIBUTION FUNCTIONS, TMDS, THEORETICAL STUDY, MONTE CARLO SIMULATIONS, HIGH ENERGY INTERACTIONS, Physics (incl. astronomy)

- Disciplines:Elementary particle and high energy physics

- Research techniques:numerical and analytical calculations, Monte Carlo methods

- Users of research expertise:Particle Physicists