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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
Forward citations
Cited by 6 Pith papers
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Transverse Charge Distribution as a Probe of Nucleon Transversity
A charge-flow measurement built only from track angles and charge signs contains a leading-twist chiral-odd dipole that matches the charge-weighted Collins moment, giving enhanced transversity-sensitive asymmetries.
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Sivers Asymmetry in Photoproduction of $J/\psi$ and Jet at the EIC
Photoproduction of J/psi+jet at the EIC shows a gluon-dominated Sivers asymmetry of up to 6-8% in the models studied, making it a promising probe of the gluon Sivers function.
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Statistical analysis of the azimuthal asymmetry in the $J/\psi$ leptoproduction in unpolarized $ep$ collisions
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The effect of TMD evolution on the Sivers asymmetry in back-to-back $J/\psi+\gamma$ and $J/\psi+\text{jet}$ production at the Electron-Ion-Collider
After including TMD evolution, the Sivers asymmetry in these J/ψ processes at EIC kinematics remains sizable and largely independent of LDME choices, providing a robust probe of the gluon Sivers function.
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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...
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Parton Distribution Functions and their Generalizations
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