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- W1489666589 abstract "Recent measurements from the HERMES, SMC, CLAS and COMPASS collaborations show a remarkably large azimuthal single‐spin asymmetries of the proton in semi‐inclusive pion leptoproduction γ*(q)p↑ → πX. The existence of such single‐spin asymmetries requires a phase difference between two amplitudes coupling the proton target with Jpz = ±12 to the same final‐state, the same amplitudes which are necessary to produce a nonzero proton anomalous magnetic moment. We show that the exchange of gauge particles between the outgoing quark and the proton spectators produces a Coulomb‐like complex phase which depends on the angular momentum Lz of the proton’s constituents and is thus distinct for different proton spin amplitudes. We then find that final‐state interactions from gluon exchange between the outgoing quark and the target spectator system lead to single‐spin asymmetries at leading twist in perturbative QCD; i.e., the rescattering corrections are not power‐law suppressed at large photon virtuality Q2 at fixed xbj." @default.
- W1489666589 created "2016-06-24" @default.
- W1489666589 creator A5042528622 @default.
- W1489666589 date "2005-01-01" @default.
- W1489666589 modified "2023-09-24" @default.
- W1489666589 title "Final-state interaction as origin of single-spin asymmetry in semi-inclusive DIS" @default.
- W1489666589 doi "https://doi.org/10.1063/1.1932925" @default.
- W1489666589 hasPublicationYear "2005" @default.
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