Spin alignment of vector meson in e+e- annihilation at Z0 pole
High Energy Physics - Phenomenology
2009-12-31 v1
Abstract
We calculate the spin density matrix of the vector meson produced in e+e- annihilation at Z^0 pole. We show that the data imply a significant polarization for the antiquark which is created in the fragmentation process of the polarized initial quark and combines with the fragmenting quark to form the vector meson. The direction of polarization is opposite to that of the fragmenting quark and the magnitude is of the order of 0.5. A qualitative explanation of this result based on the LUND string fragmentation model is given.
Cite
@article{arxiv.hep-ph/0103267,
title = {Spin alignment of vector meson in e+e- annihilation at Z0 pole},
author = {Qing-hua Xu and Chun-xiu Liu and Zuo-tang Liang},
journal= {arXiv preprint arXiv:hep-ph/0103267},
year = {2009}
}
Comments
15 pages, 2 fgiures; submitted to Phys. Rev. D