18-22 October 2021
Matsue, Shimane Prefecture, Japan
Asia/Tokyo timezone

Phenomenological assessment of proton mechanical properties from deeply virtual Compton scattering

20 Oct 2021, 16:30
30m
Room 501 (Kunibiki Messe)

Room 501

Kunibiki Messe

Parallel Session keynote talk (by invitation only) Form factors and GPDs Joint GPD - Future session

Speaker

Hervé MOUTARDE (IRFU, CEA, Université Paris-Saclay)

Description

A unique feature of generalised parton distributions is their relation to the QCD energy–momentum tensor. In particular, they provide access to the mechanical properties of the proton i.e. the distributions of pressure and shear stress induced by its quark and gluon structure. In principle the pressure distribution can be experimentally determined in a model-independent way from a dispersive analysis of deeply virtual Compton scattering data through the measurement of the subtraction constant. In practice the kinematic coverage and accuracy of existing experimental data make this endeavour a challenge. Elaborating on recent global fits of deeply virtual Compton scattering measurements using artificial neural networks, our analysis presents the current knowledge on this subtraction constant and assesses the impact of the most frequent systematic assumptions made in this field of research. This study will pave the way for future works when more precise data will become available, e.g. obtained in the foreseen electron-ion colliders EIC and EIcC.

Primary author

Hervé MOUTARDE (IRFU, CEA, Université Paris-Saclay)

Co-authors

Hervé Dutrieux (Irfu, CEA, Université Paris-Saclay) Dr Pawel Sznajder (National Centre for Nuclear Research (NCBJ), Warsaw, Poland) Prof. Cédric Lorcé Dr Arkadiusz Trawinski Dr Jakub Wagner

Presentation Materials