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Single-spin asymmetries for semi-inclusive electroproduction of charged pions in deep-inelastic scattering of positrons are measured for the first time with transverse target polarization. The asymmetry depends on the azimuthal angles of both the pion (phi) and the target spin axis (phi(S)) about the virtual-photon direction and relative to the lepton(More)
A. Airapetian,30 N. Akopov,30 Z. Akopov,30 M. Amarian,6, 30 V.V. Ammosov,22 A. Andrus,15 E.C. Aschenauer,6 W. Augustyniak,29 R. Avakian,30 A. Avetissian,30 E. Avetissian,10 P. Bailey,15 V. Baturin,21 C. Baumgarten,19 M. Beckmann,5 S. Belostotski,21 S. Bernreuther,8 N. Bianchi,10 H.P. Blok,20, 28 J. Blümlein,6 H. Böttcher,6 A. Borissov,17 A. Borysenko,10 M.(More)
A. Airapetian, N. Akopov, Z. Akopov, M. Amarian, 32 V.V. Ammosov, A. Andrus, E.C. Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, E. Avetissian, P. Bailey, V. Baturin, C. Baumgarten, M. Beckmann, S. Belostotski, S. Bernreuther, N. Bianchi, H.P. Blok, 30 H. Böttcher, A. Borissov, M. Bouwhuis, J. Brack, A. Brüll, I. Brunn, G.P. Capitani, H.C. Chiang,(More)
Double-spin asymmetries of semiinclusive cross sections for the production of identified pions and kaons have been measured in deep inelastic scattering of polarized positrons on a polarized deuterium target. Five helicity distributions including those for three sea quark flavors were extracted from these data together with reanalyzed previous data for(More)
K. Ackerstaff, A. Airapetian, N. Akopov, I. Akushevich M. Amarian, E.C. Aschenauer, H. Avakian, R. Avakian, A. Avetissian, B. Bains, C. Baumgarten, M. Beckmann, St. Belostotski, J.E. Belz, Th. Benisch, S. Bernreuther, N. Bianchi, J. Blouw, H. Böttcher, A. Borissov, J. Brack, S. Brauksiepe, B. Braun, B. Bray, St. Brons, W. Brückner, A. Brüll, E.E.W. Bruins,(More)
A. Airapetian,32 N. Akopov,32 M. Amarian,24,27,32 E. C. Aschenauer,13,14,6 H. Avakian,10 R. Avakian,32 A. Avetissian,32 E. Avetissian,10,32 B. Bains,15 C. Baumgarten,22 M. Beckmann,12 S. Belostotski,25 J. E. Belz,28,29 Th. Benisch,8 S. Bernreuther,8 N. Bianchi,10 J. Blouw,24 H. Böttcher,6 A. Borissov,6,14 M. Bouwhuis,15 J. Brack,4 S. Brauksiepe,12 B.(More)
Exclusive coherent and incoherent electroproduction of the rho(0) meson from 1H and 14N targets has been studied at the HERMES experiment as a function of coherence length (l(c)), corresponding to the lifetime of hadronic fluctuations of the virtual photon, and squared four-momentum of the virtual photon (-Q2). The ratio of 14N to 1H cross sections per(More)
A. Airapetian,31 N. Akopov,31 Z. Akopov,31 M. Amarian,26,31 E. C. Aschenauer,7 H. Avakian,11 R. Avakian,31 A. Avetissian,31 E. Avetissian,31 P. Bailey,15 B. Bains,15 V. Baturin,24 C. Baumgarten,21 M. Beckmann,12 S. Belostotski,24 S. Bernreuther,29 N. Bianchi,11 H. Böttcher,7 A. Borissov,6,19 O. Bouhali,23 M. Bouwhuis,15 J. Brack,5 S. Brauksiepe,12 W.(More)
The Hermes experiment has investigated the tensor spin structure of the deuteron using the 27.6 GeV/c positron beam of DESY HERA. The use of a tensor-polarized deuteron gas target with only a negligible residual vector polarization enabled the first measurement of the tensor asymmetry A(d)zz and the tensor structure function b(d)1 for average values of the(More)