In the chiral quark-soliton model with 1/N_c corrections, the isoscalar tensor charge is 0.81, the isovector anomalous tensor magnetic moment is 1.97, and the isoscalar tensor quadrupole moment is 5.98, completing the flavor decomposition.
Single-spin asymmetries in semi-inclusive deep-inelastic scattering on a transversely polarized hydrogen target
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abstract
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 ($\phi$) and the target spin axis ($\phi_S$) about the virtual photon direction and relative to the lepton scattering plane. The extracted Fourier component $\cmpi$ is a signal of the previously unmeasured quark transversity distribution, in conjunction with the so-called Collins fragmentation function, also unknown. The Fourier component $\smpi$ of the asymmetry arises from a correlation between the transverse polarization of the target nucleon and the intrinsic transverse momentum of quarks, as represented by the previously unmeasured Sivers distribution function. Evidence for both signals is observed, but the Sivers asymmetry may be affected by exclusive vector meson production
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New COMPASS data from polarized deuteron targets reduce uncertainties on d-quark transversity by a factor of 2.5 at large Bjorken x and will enable first extraction of the Boer-Mulders function from unpolarized nucleon data.
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Multipole structure of the nucleon tensor form factors
In the chiral quark-soliton model with 1/N_c corrections, the isoscalar tensor charge is 0.81, the isovector anomalous tensor magnetic moment is 1.97, and the isoscalar tensor quadrupole moment is 5.98, completing the flavor decomposition.
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Measurements of transverse-momentum dependent effects in semi-inclusive DIS at COMPASS
New COMPASS data from polarized deuteron targets reduce uncertainties on d-quark transversity by a factor of 2.5 at large Bjorken x and will enable first extraction of the Boer-Mulders function from unpolarized nucleon data.