| |

DATE | 2009-07-21 |

TIME | 14:30 |

PLACE | R49223, Second Physics Building , NCKU |

FIELD | Quantum Information Science |

SPEAKER | Prof. Wai Yee Keung(姜偉宜) - Dept. of Physics, Univ. of Illinois, Chicago |

TITLE | Landau-Yang Theorem and Decays of a Z' Boson into Two Z Bosons |

ABSTRACT | We study the decay of a Z' boson into two Z bosons by extending the Landau-Yang theorem to a parent particle decaying into two Z bosons. For a spin-1 parent the theorem predicts:1) there are only two possible couplings and 2) the normalized differential cross-section depends on kinematics only through a phase shift in the azimuthal angle between the two decay planes of the Z boson. When the parent is a Z' the two possible couplings are anomaly-induced and CP-violating, respectively. At the Large Hadron Collider (LHC) effects of the two couplings could be disentangled when both Z bosons decay leptonically. |