2017/03/14 by Yan-Qing Ma, Ma, Yan-Qing, Jian-Wei Qiu +3
Engineering · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Optical Polarization and Ellipsometry
paper · pdf · doi:10.48550/arxiv.1703.04752
openalex publication_date 2017/03/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.