A single-spin asymmetry in the distribution of exclusively produced π+ 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 sinφ 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).

Single-spin azimuthal asymmetry in exclusive electroproduction of π+ mesons

CIULLO, Giuseppe;FERRETTI, Paola;FABBRI, Riccardo;LENISA, Paolo;MASOLI, Francesco Antonio;REGGIANI, DAVIDE;
2002

Abstract

A single-spin asymmetry in the distribution of exclusively produced π+ 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 sinφ 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).
2002
Airapetian, A; Akopov, N; Akopov, Z; Amarian, M; Aschenauer, Ec; Avakian, H; Avakian, R; Avetissian, A; Avetissian, E; Bailey, P; Baturin, V; Baumgart...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/516798
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