Landau-Yang Theorem and Decays of a Z ′ Boson into Two Z Bosons

分类： 物理学 >> 基本粒子与场物理学 提交时间： 2017-08-24

Wai-Yee Keung Ian Low Jing Shu

摘要： 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 CERN Large Hadron Collider their effects could be disentangled when both Z bosons decay leptonically

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