Speaker
Description
The WISArD experiment aims to probe possible manifestations of new physics in the weak interaction sector of the Standard Model through precision studies of beta decay. In particular, the experiment targets the angular correlation parameter a and the Fierz interference term b, which are sensitive to exotic scalar and tensor currents beyond the vector and axial-vector interactions of the Standard Model. By investigating the β-delayed proton decay of 32Ar, WISArD seeks to determine these parameters with a precision of about 0.1%, providing constraints on new interactions that are competitive with direct searches at the highest energies accessible at the LHC. The experiment is performed at ISOLDE, CERN. Analysis of the 2024 and 2025 data-taking campaigns demonstrates that statistical uncertainties at the per-mil level have been achieved. Several systematic effects have already been evaluated, including those related to the beam profile and shape, random coincidences, catcher thickness, and solid angle. The next stage of the analysis will focus on assessing the impact of beta backscattering models and the calibration accuracy of the beta detector on the total uncertainty budget.
