We calculate the single spin asymmetry in the inclusive pion production in protonproton collisions. We generate the asymmetry at the level of fragmentation function (Collins effect) by the Lund coloured string mechanism. We compare our results with the Fermilab E704 data from p↑p collisions at 200 GeV. We show that the transversely polarized quark densities at high Bjorken x strongly differ from these predicted by the SU(6) proton wave function.

No abstract

T. T. Wu's postulate for the vertex function proposed to reproduce the exponential decrease of the high-energy large-momentum-transfer cross section is studied in terms of the 10st-Lehmann-Dyson representation, its weight function being adjusted appropriately in a large momentum region.0° Since the high-energy large-angle data on the pjJ-elastic differential cross section became experimentally available,1) there have appeared a great number of empirical and theoretical studies concerning the large-angle processes. At an early stage, Orear 2 ) pointed out that the available data have a strong dependence on transverse momentum transfer and can nearly be reproduced by the simple exponential formwhere v-S is the incident energy in units of Ge V / c, and e is the scattering angle in the center-of-mass system. *) The formula (1) spurred many theoretical Illvestigations,3)~5) which more or less discussed its asymptotic form, i.e. d(J_=O [exp (-_l Vslsin e l )] dQ 0.3

No abstract