# Beam-helicity asymmetries for single-hadron production in semi-inclusive deep-inelastic scattering from unpolarized hydrogen and deuterium targets

## TL;DR

This paper reports measurements of beam-helicity asymmetries in single-hadron production during deep-inelastic scattering, providing detailed data as functions of multiple kinematic variables for hydrogen and deuterium targets.

## Contribution

It presents new experimental measurements of beam-helicity asymmetries in semi-inclusive deep-inelastic scattering for various hadrons, analyzed across multiple kinematic variables.

## Key findings

- Asymmetries vary with Bjorken x, transverse momentum, and fractional energy.
- Data for charged pions, kaons, protons, and anti-protons are provided.
- Results enhance understanding of spin-dependent phenomena in hadron production.

## Abstract

A measurement of beam-helicity asymmetries for single-hadron production in deep-inelastic scattering is presented. Data from the scattering of 27.6 GeV electrons and positrons off gaseous hydrogen and deuterium targets were collected by the HERMES experiment. The asymmetries are presented separately as a function of the Bjorken scaling variable, the hadron transverse momentum, and the fractional energy for charged pions and kaons as well as for protons and anti-protons. These asymmetries are also presented as a function of the three aforementioned kinematic variables simultaneously.