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Revealing the hadron structure through hard exclusive processes

Project type
Znanstveno-istraživački projekti
Programme
Research Projects
Financier
Croatian Science Foundation
Start date
Feb 1st 2020
End date
Jan 31st 2024
Status
Active
Total cost
868500 HRK
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Nucleons, i.e., protons and neutrons that are the building blocks of the matter that surrounds us, pions, kaons and other hadrons consist of quarks and gluons, whose interactions are well described by the theory of strong interactions, i.e. quantum chromodynamics. But the comprehensive understanding of the bound state dynamic of hadrons and their structure is still elusive and challenging. Moreover, the experiments in particle accelerators used for Standard Model (SM) and beyond SM research are performed mostly using protons with ever higher accuracy demanding ever better description of hadron structure. In REVESTRUCTURE project we will investigate hadron structure by studying the, so-called, hard exclusive processes. Since these processes are performed at high energies where the strong force becomes weak the perturbative approach can be used in the description of the parton subprocesses and the factorization of the high and low energy dynamics enables us to access the hadron description of hadrons in terms of distribution amplitudes and generalized parton distributions. The latter objects are phenomenologically especially rewarding offering potentially a three-dimensional (3D) picture of hadrons in contrast to 1D obtained from well-known parton distribution amplitudes encountered in deeply inelastic scattering. Proposed phenomenological investigation is timely due to a recent vibrant experimental activity: a lot of data is already available or expected in the near future from JLab and COMPASS (CERN) groups, and new facilities are planned (EIC in USA, LHeC at CERN). We plan to develop the required software tools, to improve the theoretical description of the measured processes, and to analyze new processes to be measured in the future. We will confront the theoretical results with the available experimental data and through fits we will extract new informations about hadron structure. All this should make a significant step towards better understanding of hadrons.

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