Single-spin azimuthal asymmetry in exclusive electroproduction of pi+ mesons
Abstract
A single-spin asymmetry in the distribution of exclusively produced pi+ mesons azimuthally around the virtual photon direction relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. Integrated over the experimental acceptance, the sin φ moment of the polarization asymmetry of the cross section is measured to be -0.18 +/- 0.05 (stat.) +/- 0.02 (syst.). The asymmetry is also studied as a function of the relevant kinematic variables, and its magnitude is found to grow with decreasing x and increasing -t and vanish at t -> tmin (where x is the Bjorken scaling variable and t is the squared four-momentum transferred to the nucleon).
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