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Longitudinal double-spin asymmetries in semi-inclusive deep-inelastic scattering of electrons and positrons by protons and deuterons
HERMES Collaboration, A. Airapetian, N. Akopov +96
A comprehensive collection of results on longitudinal double-spin asymmetries is presented for charged pions and kaons produced in semi-inclusive deep-inelastic scattering of elect…
Bose-Einstein correlations in hadron-pairs from lepto-production on nuclei ranging from hydrogen to xenon
HERMES Collaboration, A. Airapetian, N. Akopov +116
Bose-Einstein correlations of like-sign charged hadrons produced in deep-inelastic electron and positron scattering are studied in the HERMES experiment using nuclear targets of $^…
Pentaquark search at HERMES
The HERMES Collaboration, N. Akopov, Z. Akopov +103
The earlier search at HERMES for narrow baryon states excited in quasi-real photoproduction, decaying through the channel , has been extended with improv…
Transverse polarization of hyperons from quasireal photoproduction on nuclei
The HERMES Collaboration, A. Airapetian, N. Akopov +134
The transverse polarization of hyperons was measured in inclusive quasireal photoproduction for various target nuclei ranging from hydrogen to xenon. The data were obtained by…
Reevaluation of the parton distribution of strange quarks in the nucleon
The HERMES Collaboration, A. Airapetian, N. Akopov +111
An earlier extraction from the HERMES experiment of the polarization-averaged parton distribution of strange quarks in the nucleon has been reevaluated using final data on the mult…
Transverse target single-spin asymmetry in inclusive electroproduction of charged pions and kaons
The HERMES Collaboration, A. Airapetian, N. Akopov +129
Single-spin asymmetries were investigated in inclusive electroproduction of charged pions and kaons from transversely polarized protons at the HERMES experiment. The asymmetries we…
Multiplicities of charged pions and kaons from semi-inclusive deep-inelastic scattering by the proton and the deuteron
HERMES Collaboration, A. Airapetian, N. Akopov +135
Multiplicities in semi-inclusive deep-inelastic scattering are presented for each charge state of π^\pm and K^\pm mesons. The data were collected by the HERMES experiment at the HE…
Beam-helicity and beam-charge asymmetries associated with deeply virtual Compton scattering on the unpolarised proton
The HERMES Collaboration, A. Airapetian, N. Akopov +124
Beam-helicity and beam-charge asymmetries in the hard exclusive leptoproduction of real photons from an unpolarised hydrogen target by a 27.6 GeV lepton beam are extracted from the…
Multidimensional Study of Hadronization in Nuclei
HERMES Collaboration, A. Airapetian, N. Akopov +137
Hadron multiplicities in semi-inclusive deep-inelastic scattering were measured on neon, krypton and xenon targets relative to deuterium at an electron(positron)-beam energy of 27.…
Measurement of double-spin asymmetries associated with deeply virtual Compton scattering on a transversely polarized hydrogen target
The HERMES Collaboration, A. Airapetian, N. Akopov +128
Double-spin asymmetries in exclusive electroproduction of real photons from a transversely polarized hydrogen target are measured with respect to the product of target polarization…
Inclusive Measurements of Inelastic Electron and Positron Scattering from Unpolarized Hydrogen and Deuterium Targets
The HERMES Collaboration, A. Airapetian, N. Akopov +140
Results of inclusive measurements of inelastic electron and positron scattering from unpolarized protons and deuterons at the HERMES experiment are presented. The structure functio…
Measurement of azimuthal asymmetries associated with deeply virtual Compton scattering on a longitudinally polarized deuterium target
The HERMES Collaboration, A. Airapetian, N. Akopov +144
Azimuthal asymmetries in exclusive electroproduction of a real photon from a longitudinally polarized deuterium target are measured with respect to target polarization alone and wi…
Effects of transversity in deep-inelastic scattering by polarized protons
HERMES collaboration, A. Airapetian, N. Akopov +142
Single-spin asymmetries for pions and charged kaons are measured in semi-inclusive deep-inelastic scattering of positrons and electrons off a transversely nuclear-polarized hydroge…
Exclusive Leptoproduction of Real Photons on a Longitudinally Polarised Hydrogen Target
The HERMES Collaboration, A. Airapetian, N. Akopov +147
Polarisation asymmetries are measured for the hard exclusive leptoproduction of real photons from a longitudinally polarised hydrogen target. These asymmetries arise from the deepl…
Leading-Order Determination of the Gluon Polarization from high- Hadron Electroproduction
The HERMES Collaboration, A. Airapetian
Longitudinal double-spin asymmetries of charged hadrons with high transverse momentum have been measured in electroproduction using the \hermes\ detector at \hera. Processes…
Nuclear-mass dependence of azimuthal beam-helicity and beam-charge asymmetries in deeply virtual Compton scattering
The HERMES collaboration, A. Airapetian
The nuclear-mass dependence of azimuthal cross section asymmetries with respect to charge and longitudinal polarization of the lepton beam is studiedfor hard exclusive electroprodu…
Measurement of azimuthal asymmetries associated with deeply virtual Compton scattering on an unpolarized deuterium target
The HERMES Collaboration, A. Airapetian
Azimuthal asymmetries in exclusive electroproduction of a real photon from an unpolarized deuterium target are measured with respect to beam helicity and charge. They appear in the…
Single-spin azimuthal asymmetry in exclusive electroproduction of pi+ mesons on transversely polarized protons
HERMES Collaboration
Exclusive electroproduction of pi+ mesons was studied by scattering 27.6 GeV positrons or electrons off a transversely polarized hydrogen target. The single-spin azimuthal asymmetr…
Search for a Two-Photon Exchange Contribution to Inclusive Deep-Inelastic Scattering
The HERMES Collaboration, A. Airapetian
The transverse-target single-spin asymmetry for inclusive deep-inelastic scattering with effectively unpolarized electron and positron beams off a transversely polarized hydrogen t…
Transverse momentum broadening of hadrons produced in semi-inclusive deep-inelastic scattering on nuclei
The HERMES Collaboration, A. Airapetian
The first direct measurement of the dependence on target nuclear mass of the average squared transverse momentum <pt**2> of pi+, pi-, and K+ mesons from deep-inelastic lepton scatt…
Observation of the Naive-T-odd Sivers Effect in Deep-Inelastic Scattering
The HERMES Collaboration
Azimuthal single-spin asymmetries of lepto-produced pions and charged kaons were measured on a transversely polarized hydrogen target. Evidence for a naive-T-odd, transverse-moment…
Spin Density Matrix Elements in Exclusive rho^0 Electroproduction on 1H and 2H Targets at 27.5 GeV Beam Energy
HERMES Collaboration, A. Airapetian
Spin Density Matrix Elements (SDMEs) describing the angular distribution of exclusive rho^0 electroproduction and decay are determined in the HERMES experiment with 27.6 GeV beam e…
Hadronization in semi-inclusive deep-inelastic scattering on nuclei
The HERMES Collaboration, A. Airapetian
A series of semi-inclusive deep-inelastic scattering measurements on deuterium, helium, neon, krypton, and xenon targets has been performed in order to study hadronization. The dat…
Beam-Spin Asymmetries in the Azimuthal Distribution of Pion Electroproduction
HERMES Collaboration, A. Airapetian
A measurement of the beam-spin asymmetry in the azimuthal distribution of pions produced in semi-inclusive deep-inelastic scattering off protons is presented. The measurement was p…