Precision measurements with jets and particles at HERA

TL;DR

This paper presents precise measurements of jets, particles, and related phenomena at HERA, using experimental data to test quantum chromodynamics and extract fundamental constants like alpha_s.

Contribution

It provides new experimental results on jet cross sections, particle distributions, and charge asymmetry, enhancing understanding of QCD at HERA energies.

Findings

Determined the strong coupling alpha_s at various scales.

Measured prompt photon production and compared with pQCD.

First measurement of charge asymmetry at HERA.

Abstract

Inclusive jet and multijet cross sections measured in ep collisions in different kinematic regions by the H1 and ZEUS experiments are shown. The measurements are used to extract the strong coupling alpha_s as a function of the scale and at the mass of the Z-boson. Results from prompt photon production in comparison with pQCD calculations are shown in photoproduction and deep-inelastic scattering. Other topics address scaled momentum distributions of charged particles, a measurement of the transverse momenta of charged particles and the first measurement of the charge asymmetry at HERA.