Positrons and Electrons at HERA and HERMES

Journal Article · Wed Sep 02 04:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3232030· OSTI ID:21344536

Riedl, Caroline ^[1]

---

1. DESY, 15738 Zeuthen (Germany)

The HERA electron-proton storage ring at DESY, Hamburg, provided a unique laboratory for the collection of data in deep-inelastic charged lepton-proton scattering at a center-of-mass energy of about 7 GeV for the fixed-target experiment HERMES and at 318 GeV for the collider experiments ZEUS and Hl. HERA could be operated with both electrons and positrons. The ability of the lepton beam to polarize itself was exploited.Data taken with the HERMES spectrometer on unpolarized and transversely polarized gaseous targets are presented. Two examples involving interference processes are chosen that are sensitive to the beam charge: the measurement of azimuthal asymmtries in deeply-virtual COMPTON scattering and the search for a two-photon exchange signal at HERMES.

• OSTI ID: 21344536
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1160; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BARYONS
BASIC INTERACTIONS
BOSONS
CHARGED-PARTICLE REACTIONS
COMPTON EFFECT
CYCLIC ACCELERATORS
DEEP INELASTIC SCATTERING
DESY
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELECTRON REACTIONS
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
EXCHANGE INTERACTIONS
FERMIONS
GEV RANGE
HADRONS
HERA STORAGE RING
INELASTIC SCATTERING
INTERACTIONS
LEPTON REACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LEPTON-PROTON INTERACTIONS
LEPTONS
MASSLESS PARTICLES
MATTER
MEASURING INSTRUMENTS
MULTIPARTICLE SPECTROMETERS
NUCLEAR REACTIONS
NUCLEONS
PARTICLE IDENTIFICATION
PARTICLE INTERACTIONS
PHOTONS
POLARIZATION
POSITRON REACTIONS
POSITRONS
PROTONS
SCATTERING
SPECTROMETERS
STORAGE RINGS
SYNCHROTRONS