SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 22: Calorimeter / Detector Systems I

T 22.3: Vortrag

Montag, 20. März 2023, 17:00–17:15, WIL/C133

Automated Photon Energy Resolution Calibration at Belle II — •Alexander Heidelbach and Torben Ferber — Institute of Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT)

At the Belle II experiment in Tsukuba, Japan, the electromagnetic calorimeter is used to measure the energy of photons in e⁺e⁻ collisions. The utilization of physical observables, like the invariant mass, from measured quantities, requires precise knowledge of the uncertainties on the components of the four-momentum. To account for uncertainties of these components, the determination of the full covariance matrix is crucial. This matrix stores the variances and covariances of the differences between reconstructed and generated four-momentum vector components for data, respectively MC. At Belle II, in the case of photons, the entries of the photon covariance matrix are determined with the help of radiative dimuon decays e⁺e⁻→µ⁺µ⁻γ. This talk presents the studies on the radiative dimuon decay which are used to extract the photon energy resolution from data. Additionally, it discusses the current efforts to automatize the extraction procedure for run-dependent data and the implementation into the Belle II Analysis Software Framework.