Speaker
Abdollah Mohammadi
(University of Wisconsin Madison)
Description
We report on a measurement of the tau lepton polarisation using leptonic and hadronic tau lepton decays in Z -> di-tau events. A sample of pp collisions corresponding to an integrated luminosity of 36.3 fb-1 at a centre of mass energy of 13 TeV is used. The analysis method using template fitting techniques will be described for different decay modes. The measured average polarisation corrected to the Z-pol is in good agreement with the Standard Model value of the lepton asymmetry parameter. The tau-polarisation determines the ratio of the neutral-current vector to axial-vector coupling of the tau lepton and the weak mixing angle independently of the production process of the Z resonance. The result and perspectives are discussed.
Name of collaboration or list of co-authors
CMS
Primary author
Abdollah Mohammadi
(University of Wisconsin Madison)
