The Fractured Boer-Mulders Effect in the Production of Polarized Baryons

Details The Fractured Boer-Mulders Effect in the Production of Polarized Baryons The Fractured Boer-Mulders Effect in the Production of Polarized Baryons

2009-10-28

arxiv.org/abs/0910.5420v1

Phys.Rev.D81:034029,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages 3 tables and 8 figures

Scientific paper

10.1103/PhysRevD.81.034029

The fractured Boer-Mulders functions describe an inriguing class of polarization effects for the production of baryons in the target fragmentation region of deep-inelastic processes. These functions characterize transverse momentum asymmetries related to the spin orientation for different flavors of axial vector diquarks in an unpolarized ensemble of protons just as the familiar Boer-Mulders functions characterize transverse momentum asymmetries connected to the spin orientation of quarks in unpolarized targets. The asymmetries of the fractured Boer-Mulders effect originating in the proton distribution function can be separated kinematically, both in SIDIS and in the Drell-Yan process from the asymmetries of the polarizing fracture functions generated during the soft color rearrangement of the fragmentation process. The experimental requirements for this separation are presented in this article and it is shown that the fractured Boer-Mulders effect should change sign between Drell-Yan and SIDIS while the polarizing fracture functions remain the same. Simple isospin arguments indicate the two polarization mechanisms should give significantly different results for the production of polarized lambdas and sigmas.

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