Model-independent constraints on the shape parameters of dilepton angular distributions

Details Model-independent constraints on the shape parameters of dilepton angular distributions Model-independent constraints on the shape parameters of dilepton angular distributions

2011-02-19

arxiv.org/abs/1102.3946v1

Phys.Rev.D83:056008,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages

Scientific paper

10.1103/PhysRevD.83.056008

The coefficients determining the dilepton decay angular distribution of vector particles obey certain positivity constraints and a rotation-invariant identity. These relations are a direct consequence of the covariance properties of angular momentum eigenstates and are independent of the production mechanism. The Lam-Tung relation can be derived as a particular case, simply recognizing that the Drell-Yan dilepton is always produced transversely polarized with respect to one or more quantization axes. The dilepton angular distribution continues to be characterized by a frame-independent identity also when the Lam-Tung relation is violated. Moreover, the violation can be easily characterized by measuring a one-dimensional distribution depending on one shape coefficient.

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