Hadronic Final States and Spectroscopy in ep Collisions at HERA

TL;DR

This paper reports recent measurements of hadronic final states, spectroscopy, and prompt photon production in ep collisions at HERA, providing insights into QCD processes and potential exotic states.

Contribution

It presents new experimental results on hadronic spectra, strange hadron production, and searches for pentaquarks in ep collisions at HERA, comparing data with theoretical models.

Findings

Observation of charged particle spectra in the Breit frame

Measurement of neutral strange hadron production rates

Prompt photon cross sections consistent with pQCD predictions

Abstract

Recent results on spectroscopy and the measurement of hadronic final states in ep collisions from the H1 and ZEUS collaborations are presented using data sets with an integrated luminosity between 44 and 121 pb^-1 collected during the HERA I running period. Besides a search for resonant states which could be interpreted as pentaquarks, a study of charged particle momentum spectra in the Breit frame and a measurement of neutral strange hadron production is shown. Furthermore two recent measurements of prompt photons are presented and compared with pQCD calculations. The measurements are performed in photoproduction with a four-momentum transfer squared Q^2\sim 0 GeV^2 or in deep inelastic scattering at Q^2>1 GeV^2.