## Abstract

Helicity density matrix elements for inclusive K*(892)^{0} mesons from hadronic Z^{0} decays have been measured over the full range of K*^{0} momentum using data taken with the OPAL experiment at LEP. A preference for occupation of the helicity zero state is observed at all scaled momentum x_{p} values above 0.3, with the matrix element ρ_{00} rising to 0.66 ± 0.11 for x_{p} > 0.7. The values of the real part of the off-diagonal element ρ_{1-1} are negative at large x_{p}, with a weighted average value of -0.09 ± 0.03 for x_{p} > 0.3, in agreement with new theoretical predictions based on Standard Model parameters and coherent fragmentation of the qq system from the Z^{0} decay. All other helicity density matrix elements measured are consistent with zero over the entire xp range. The K*^{0} fragmentation function has also been measured and the total rate determined to be 0.74 ± 0.02 ± 0.02 K*(892)^{0} mesons per hadronic Z^{0} decay.

Original language | English |
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Pages (from-to) | 210-224 |

Number of pages | 15 |

Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 412 |

Issue number | 1-2 |

DOIs | |

State | Published - 23 Oct 1997 |

Externally published | Yes |

## ASJC Scopus subject areas

- Nuclear and High Energy Physics

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