Evidence for a narrow |S|=1 baryon state at a mass of 1528 MeV in quasi-real photoproduction
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DOIAbstract
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 (φ) and the target spin axis (φS) about the virtual-photon direction and relative to the lepton scattering plane. The extracted Fourier component 〈sin(φ + φS) 〉UTπ is a signal of the previously unmeasured quark transversity distribution, in conjunction with the Collins fragmentation function, also unknown. The component 〈sin(φ - φS〉 UTπ arises from a correlation between the transverse polarization of the target nucleon and the intrinsic transverse momentum of quarks, as represented by the prev...
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