Spin alignment of vector meson in e+e- annihilation at Z0 pole

Details Spin alignment of vector meson in e+e- annihilation at Z0 pole Spin alignment of vector meson in e+e- annihilation at Z0 pole

2001-03-25

arxiv.org/abs/hep-ph/0103267v1

Phys.Rev.D63:111301,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 2 fgiures; submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.63.111301

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.

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