31st International Workshop on Deep Inelastic Scattering

Measurement of azimuthal modulations in SIDIS off proton target at COMPASS

11 avr. 2024, 09:20

20m

Maison MINATEC, Grenoble, FRANCE

Regular parallel talk WG5: Spin and 3D Structure WG5

Orateur

Vendula Benešová

Description

The azimuthal angle distribution (${\varphi }_h$) of hadrons produced in deep inelastic scattering serves as a powerful tool for probing nucleon structure in terms of the transverse momentum-dependent parton distribution functions, and the fragmentation functions. For an unpolarized nucleon, three azimuthal modulations arise: $\cos {\varphi }_h$ related to the Cahn effect, $\cos 2{\varphi }_h$ linked to the Boer-Mulders function, and $\sin {\varphi }_h$ known as beam-spin asymmetry, each revealing insights into combinations of twist-two or higher-twist distribution and fragmentation functions.

The COMPASS collaboration at CERN collected tens of millions of semi-inclusive deep inelastic scattering events across 2016 and 2017 using a longitudinally polarized 160 GeV/c muon beam scattering off a liquid hydrogen target. The data from 2016 corresponding to about 1/3 of the full sample have been analyzed to measure the azimuthal modulations of charged hadrons. Results were corrected for QED radiative effects using DJANGOH MC generator.

Documents de présentation

DIS_2024_Benesova.pdf