Spin Alignment of Vector Mesons in Polarized and Unpolarized High Energy Reactions

Details Spin Alignment of Vector Mesons in Polarized and Unpolarized High Energy Reactions Spin Alignment of Vector Mesons in Polarized and Unpolarized High Energy Reactions

2003-11-29

arxiv.org/abs/hep-ph/0312003v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Prepared for the proceedings of the X-th International Workshop on High Energy Spin Physics, JINR Dubna, Sept. 16 - 20, 2003

Scientific paper

Recent e+e- annihilation experiments show a striking spin alignment of vector mesons produced in the fragmentation of a polarized quark.We show that these data imply a simple relation between the polarization of the anti-quark, which is produced in the fragmentation process to combine with the fragmenting quark to form the meson, and that of the fragmenting quark. After having obtained a good fit to the e+e- data, we extend the calculations to lepton-nucleon and nucleon-nucleon collisions with polarized beams. We also discuss the relation between the spin alignment of vector meson in unpolarized hadron-hadron collisions and the single-spin left-right asymmetry. We make predictions for the polarization of the vector mesons in these reactions which can be checked by future experiments.

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