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

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arxiv hep-ph/0103267 v1 pith:WOAEOV2I submitted 2001-03-25 hep-ph

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

classification hep-ph
keywords mesonquarkvectorannihilationfragmentationfragmentingpolarizationpole
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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