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Transversely polarized parton densities their evolution and their measurement

Abstract : The transverse spin asymmetry of a quark in a baryon and the linear polarization of a gluon in a vector meson are studied from thet-channel point of view. Using the Altarelli-Parisi approach, they are shown to obey independent evolution equations and to decrease with increasingQ 2. We investigate the possibility to measure them at leading twist, to leading order in α and αs and without analyzing the final polarizations. This requires simultaneous polarization of the beam and the target; the observable effect is in the azimuthal distribution of the highP T particle or jet. Assuming a simple (quark+scalar diquark) model for the baryon, a large asymmetry is expected inp p¯ Drell-Yan collisions, a smaller one in highP T pp collisions, from the interference term in the scattering of two identical quarks.
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X. Artru, M. Mekhfi. Transversely polarized parton densities their evolution and their measurement. Zeitschrift für Physik C Particles and Fields, Springer Verlag, 1990, 45, pp.669-676. ⟨10.1007/BF01556280⟩. ⟨in2p3-00001002⟩



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