Rotation-invariant observables in polarization measurements
Abstract
Polarization measurements provide a detailed method to test the Standard Model and to search for new physics. Most previous studies depend on pre-selected coordinates, which blurs the significance of the results. The construction of two rotation-invariant observables in vector boson decay into a fermion pair has been proved to be a big success. In this work, we show that there are more rotation-invariant observables and provide a general recipe to find all of them in an arbitrary decay process. Taking spin-1/2 and spin-1 particle decay processes as examples, we calculate the explicit expressions of all rotation-invariant observables, which can serve as a robust test of the detector acceptance and help the analysis of experimental data.
Cite
@article{arxiv.1703.04752,
title = {Rotation-invariant observables in polarization measurements},
author = {Yan-Qing Ma and Jian-Wei Qiu and Hong Zhang},
journal= {arXiv preprint arXiv:1703.04752},
year = {2017}
}
Comments
11 pages