Single-spin azimuthal asymmetry in exclusive electroproduction of pi^+ mesons

Details Single-spin azimuthal asymmetry in exclusive electroproduction of pi^+ mesons Single-spin azimuthal asymmetry in exclusive electroproduction of pi^+ mesons

2001-12-17

arxiv.org/abs/hep-ex/0112022v4

Phys.Lett.B535:85-92,2002

Physics

High Energy Physics

High Energy Physics - Experiment

PLB accepted version, 6 pages, 4 figures, LaTex (revtex4), corrected typo

Scientific paper

10.1016/S0370-2693(02)01780-X

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 \phi 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 -> t_min (where x is the Bjorken scaling variable and t is the squared four-momentum transferred to the nucleon).

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