@article{b450a89867994fb5b4b48956b3f68131,

title = "Evidence for a single-spin azimuthal asymmetry in semi-inclusive pion electroproduction",

abstract = "Single-spin asymmetries for semi-inclusive pion production in deep-inelastic scattering have been measured for the first time. A significant target-spin asymmetry of the distribution in the azimuthal angle phi of the pion relative to the lepton scattering plane was formed for pi(+) electroproduction on a longitudinally polarized hydrogen target. The corresponding analyzing power in the sin phi moment of the cross section is 0.022 +/- 0.005 +/- 0.003. This result can be interpreted as the effect of terms in the cross section involving chiral-odd spin distribution functions in combination with a chiral-odd fragmentation function that is sensitive to the transverse polarization of the fragmenting quark.",

keywords = "FRAGMENTATION FUNCTIONS, ANALYZING POWER, DISTRIBUTIONS, LEPTOPRODUCTION, NUCLEONS, BEAM",

author = "A. Airapetian and N. Akopov and M. Amarian and E.C. Aschenauer and H. Avakian and R. Avakian and A. Avetissian and E. Avetissian and B. Bains and C. Baumgarten and M. Beckmann and S. Belostotski and J.E. Belz and T. Benisch and S. Bernreuther and N. Bianchi and J. Blouw and H. Bottcher and A. Borissov and M. Bouwhuis and J. Brack and S. Brauksiepe and B. Braun and B. Bray and S. Brons and W. Bruckner and A. Brull and E.E.W. Bruins and H.J. Bulten and G.P. Capitani and P. Carter and P. Chumney and E. Cisbani and G.R. Court and P.F. Dalpiaz and {De Sanctis}, E. and {De Schepper}, D. and E. Devitsin and P.K.A.D. Huberts and {Di Nezza}, P. and M. Duren and A. Dvoredsky and G. Elbakian and J. Ely and A. Fantoni and A. Fechtchenko and M. Ferstl and K. Fiedler and B.W. Filippone and {van den Brand}, J.F.J. and {HERMES Collaboration}",

year = "2000",

month = may,

day = "1",

doi = "10.1103/PhysRevLett.84.4047",

language = "English",

volume = "84",

pages = "4047--4051",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "18",

}