The HERMES Spectrometer

Abstract

The HERMES experiment is collecting data on inclusive and semi-inclusive deep inelastic scattering of polarised positrons from polarised targets of H, D, and He. These data give information on the spin structure of the nucleon. This paper describes the forward angle spectrometer built for this purpose. The spectrometer includes numerous tracking chambers (micro-strip gas chambers, drift and proportional chambers) in front of and behind a 1.3 T.m magnetic field, as well as an extensive set of detectors for particle identification (a lead-glass calorimeter, a pre-shower detector, a transition radiation detector, and a threshold Cherenkov detector). Two of the main features of the spectrometer are its good acceptance and identification of both positrons and hadrons, in particular pions. These characteristics, together with the purity of the targets, are allowing HERMES to make unique contributions to the understanding of how the spins of the quarks contribute to the spin of the nucleon.

37 pages, 32 figures, 4 tables

Cited by in corpus (94)

• Single-spin asymmetries in semi-inclusive deep-inelastic scattering on a transversely polarized hydrogen target
• Precise determination of the spin structure function ${\mathbf{g}}_1$ of the proton, deuteron and neutron
• Measurement of the Beam-Spin Azimuthal Asymmetry Associated with Deeply-Virtual Compton Scattering
• Observation of the Naive-T-odd Sivers Effect in Deep-Inelastic Scattering
• Observation of a Single-Spin Azimuthal Asymmetry in Semi-Inclusive Pion Electro-Production
• Quark helicity distributions in the nucleon for up, down, and strange quarks from semi--inclusive deep--inelastic scattering
• Evidence for a narrow |S|=1 baryon state at a mass of 1528 MeV in quasi-real photoproduction
• Parton Fragmentation Functions
• Effects of transversity in deep-inelastic scattering by polarized protons
• The Flavor Asymmetry of the Light Quark Sea from Semi-inclusive Deep-inelastic Scattering
• Multiplicities of charged pions and kaons from semi-inclusive deep-inelastic scattering by the proton and the deuteron
• Single-spin Azimuthal Asymmetries in Electroproduction of Neutral Pions in Semi-inclusive Deep-inelastic Scattering
• The Spin Structure of the Nucleon
• Flavor Decomposition of the Polarized Quark Distributions in the Nucleon from Inclusive and Semi-inclusive Deep-inelastic Scattering
• Measurement of the Spin Asymmetry in the Photoproduction of Pairs of High-pT Hadrons at HERMES
• Measurement of Parton Distributions of Strange Quarks in the Nucleon from Charged-Kaon Production in Deep-Inelastic Scattering on the Deuteron
• Diffractive Vector Meson Production at HERA: from Soft to Hard QCD
• Hadronization in semi-inclusive deep-inelastic scattering on nuclei
• The HERMES Dual-Radiator Ring Imaging Cerenkov Detector
• Quark fragmentation to ${\pi }^{\pm }$, ${\pi }^0$, $K^{\pm }$, $p$ and $\bar{p}$ in the nuclear environment
• Flavor decomposition of the sea quark helicity distributions in the nucleon from semi-inclusive deep-inelastic scattering
• Measurement of single-spin azimuthal asymmetries in semi-inclusive electroproduction of pions and kaons on a longitudinally polarised deuterium target
• The Beam--Charge Azimuthal Asymmetry and Deeply Virtual Compton Scattering
• The HERMES Polarized Hydrogen and Deuterium Gas Target in the HERA Electron Storage Ring
• Beam-helicity and beam-charge asymmetries associated with deeply virtual Compton scattering on the unpolarised proton
• First Measurement of the Tensor Structure Function $b_1$ of the Deuteron
• The Longitudinal Polarimeter at HERA
• Measurement of Azimuthal Asymmetries With Respect To Both Beam Charge and Transverse Target Polarization in Exclusive Electroproduction of Real Photons
• Azimuthal distributions of charged hadrons, pions, and kaons produced in deep-inelastic scattering off unpolarized protons and deuterons
• Evidence for a Transverse Single-Spin Asymmetry in Leptoproduction of pi+pi- Pairs
• Pattern Recognition and Event Reconstruction in Particle Physics Experiments
• Hadron attenuation in deep inelastic lepton-nucleus scattering
• Nuclear Effects on R = sigma_L / sigma_T in Deep-Inelastic Scattering
• Erratum to: "Nuclear Effects on R=σ_L/σ_T in Deep-Inelastic Scattering" Phys.Lett. B475(2000)386
• Measurement of double-spin asymmetries associated with deeply virtual Compton scattering on a transversely polarized hydrogen target
• Transverse momentum broadening of hadrons produced in semi-inclusive deep-inelastic scattering on nuclei
• Exclusive Leptoproduction of Real Photons on a Longitudinally Polarised Hydrogen Target
• Beam-helicity asymmetry arising from deeply virtual Compton scattering measured with kinematically complete event reconstruction
• Cross sections for hard exclusive electroproduction of pi+ mesons on a hydrogen target
• Leading-Order Determination of the Gluon Polarization from high-$p_T$ Hadron Electroproduction
• Population synthesis to constrain Galactic and Stellar Physics- I- Determining age and mass of thin-disc red-giant stars
• The Q^2-Dependence of Nuclear Transparency for Exclusive ${\rho }^0$ Production
• Observation of a Coherence Length Effect in Exclusive Rho^0 Electroproduction
• Beam-Spin Asymmetries in the Azimuthal Distribution of Pion Electroproduction
• Evidence for Quark-Hadron Duality in the Proton Spin Asymmetry $A_1$
• Spin Density Matrix Elements in Exclusive rho^0 Electroproduction on 1H and 2H Targets at 27.5 GeV Beam Energy
• Single-spin azimuthal asymmetry in exclusive electroproduction of pi+ mesons on transversely polarized protons
• Separation of contributions from deeply virtual Compton scattering and its interference with the Bethe--Heitler process in measurements on a hydrogen target
• Transition Radiation Detectors
• Measurement of the virtual-photon asymmetry A2 and the spin-structure function g2 of the proton
• Multidimensional Study of Hadronization in Nuclei
• The ALICE Transition Radiation Detector: construction, operation, and performance
• Measurement of Longitudinal Spin Transfer to Lambda Hyperons in Deep-Inelastic Lepton Scattering
• Measurement of azimuthal asymmetries associated with deeply virtual Compton scattering on an unpolarized deuterium target
• Search for a Two-Photon Exchange Contribution to Inclusive Deep-Inelastic Scattering
• Nuclear-mass dependence of azimuthal beam-helicity and beam-charge asymmetries in deeply virtual Compton scattering
• Longitudinal Spin Transfer to the $\Lambda$ Hyperon in Semi-Inclusive Deep-Inelastic Scattering
• Inclusive Measurements of Inelastic Electron and Positron Scattering from Unpolarized Hydrogen and Deuterium Targets
• Angular distributions in hard exclusive production of pion pairs
• Single-spin azimuthal asymmetry in exclusive electroproduction of pi^+ mesons
• Exclusive rho-0 electroproduction on transversely polarized protons
• Double hadron leptoproduction in the nuclear medium
• Measurement of azimuthal asymmetries associated with deeply virtual Compton scattering on a longitudinally polarized deuterium target
• Transverse Polarization of Lambda and Lambda-bar Hyperons in Quasireal Photoproduction
• The Q^2-dependence of the Generalised Gerasimov-Drell-Hearn Integral for the Proton
• Photon-meson transition form factors of light pseudoscalar mesons
• Search for an exotic S=-2, Q=-2 baryon resonance at a mass near 1862 MeV in quasi-real photoproduction
• CKM Results From CLEO
• Ratios of Helicity Amplitudes for Exclusive rho-0 Electroproduction
• Double-Spin Asymmetry in the Cross Section for Exclusive rho^0 Production in Lepton-Proton Scattering
• Longitudinal double-spin asymmetries in semi-inclusive deep-inelastic scattering of electrons and positrons by protons and deuterons
• Transverse polarization of $\Lambda$ hyperons from quasireal photoproduction on nuclei
• Beam-helicity asymmetries for single-hadron production in semi-inclusive deep-inelastic scattering from unpolarized hydrogen and deuterium targets
• Modification of transition radiation by three-dimensional topological insulators
• Hard Exclusive Electroproduction of ${\pi }^{+}{\pi }^{-}$ Pairs
• Ratios of helicity amplitudes for exclusive ${\rho }^0$ electroproduction on transversely polarized protons
• The HERMES Recoil Detector
• Prototype tests for the ALICE TRD
• Review of Searches for Rare Processes and Physics Beyond the Standard Model at HERA
• Don't Forget to Measure $\Delta s$
• The Time-of-Flight Technique for the HERMES Experiment
• Hermes and the spin of the proton
• The SeaQuest Spectrometer at Fermilab
• Ratio of $\bar{\Lambda }/\Lambda$ in Semi-inclusive Electroproduction
• Beam-helicity asymmetry in associated electroproduction of real photons $ep\to e\gamma \pi N$ in the $\Delta$-resonance region
• Exclusive pi^+ production at HERMES
• Transverse target single-spin asymmetry in inclusive electroproduction of charged pions and kaons
• Azimuthal distributions in radiative decay of polarized $\tau$ lepton
• Transverse distortion and single-spin asymmetries for low-lying octet baryons
• Flavor-dependent azimuthal modulations in unpolarized SIDIS cross section at HERMES
• Making the $\mu$OST of the Muon Collider
• Single-spin asymmetries in semi-inclusive pion production
• Measurement of the transverse target-spin asymmetry associated with deeply virtual Compton scattering on the proton
• Development and characterization of MPGD-based transition radiation detectors