Single-spin asymmetries in semi-inclusive deep-inelastic scattering on a transversely polarized hydrogen target

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 ($\varphi$) and the target spin axis (${\varphi }_S$) 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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• Sivers effect in semi-inclusive DIS and in the Drell-Yan process
• Studies of TMDs with CLAS
• Measurement of transverse single-spin asymmetries for dijet production in polarized proton-proton collisions at $\sqrt{\mathbf{s}}$ = 200 $\mathrm{GeV}$
• The Sivers asymmetry of vector meson production in semi-inclusive deep inelastic scattering
• Novel QCD Effects from Initial and Final State Interactions
• Transversity signals at COMPASS
• The transversity parton distribution function of the nucleon using the pseudo-distribution approach
• Fragmentation contributions to transverse nucleon spin observables in semi-inclusive deep-inelastic scattering at NLO
• Accessing tri-gluon correlations in the nucleon via the single spin asymmetry in open charm production
• Spin asymmetry at large x_F and k_T
• Phenomenology of Transverse Momentum Dependent Parton Densities
• The neutron transversity from semi-inclusive DIS off 3He