Flavor-dependent azimuthal modulations in unpolarized SIDIS cross section at HERMES

TL;DR

This paper reports on detailed measurements of azimuthal modulations in unpolarized SIDIS at HERMES, revealing flavor-dependent insights into the nucleon's transverse momentum and spin structure.

Contribution

It introduces a 4D unfolding method to measure azimuthal modulations, providing new flavor-dependent information on the nucleon's transverse degrees of freedom.

Findings

Measured azimuthal modulations for different targets and hadron charges.

Extracted flavor-dependent transverse momentum information.

Enhanced understanding of nucleon internal transverse structure.

Abstract

The $\cos\phi_h$ and $\cos2\phi_h$ azimuthal modulations of the unpolarized hadron Semi-Inclusive Deep Inelastic Scattering cross section are sensitive to the quark intrinsic transverse momentum and transverse spin. These modulations have been measured at HERMES in a fully differential way by means of a 4-dimensional unfolding procedure to correct for instrumental effects. Results have been extracted for hydrogen and deuterium targets and separately for positively and negatively charged pions and kaons, to access flavor-dependent information about the nucleon internal transverse degrees of freedom.