Which electroweak mixing angle do we effectively measure?

by Alessandro Vicini (Università degli Studi e INFN Milano (IT)), Federico Vazzoler (Deutsches Elektronen-Synchrotron (DE))

Thursday 22 Feb 2024, 11:00 → 13:00 Europe/Zurich

4/3-006 - TH Conference Room (CERN)

The determination of the couplings of the Z boson to fermions is an important test of the Standard Model, with sensitivity to New Physics effects. The effective leptonic weak mixing angle has been determined at LEP and SLD with better than per mil precision. With precision measurement of the differential Drell-Yan distributions at the LHC, the prospects for measurements of the electroweak mixing angle in hadronic collisions are promising, and uncertainties are potentially competitive to those from the current world-leading measurements. Beyond the use of hadron collider data as an overall closure test of the EW sector of the Standard Model, such measurements could help to resolve the current tensions in the electroweak mixing angle between lepton collider measurements. We discuss the extraction of this coupling from the kinematical distributions of the Neutral Current Drell-Yan process at the LHC and comment on this study's experimental and theoretical systematics.

 

Federico Vazzoler is a CMS experimental physicist with an extra eye for particle physics phenomenology aspects. He obtained his PhD at the University of Trieste, working on multi-boson measurements. Currently, he is a Research Fellow at DESY. His research work focuses on precision measurements of fundamental SM parameters, such as the strong coupling constant, the W boson mass, and the electroweak mixing angle.

 

Alessandro Vicini got his PhD from the University of Padova in 1996.
He is currently Associate Professor of Theoretical Physics at the University of Milano and CERN Scientific Associate.