Performance and calibration of the ATLAS Tile Calorimeter

The Tile Calorimeter (TileCal) is a sampling hadronic calorimeter covering the central region of the ATLAS experiment, with steel as absorber and plastic scintillators as active medium. The scintillators are read-out by the wavelength shifting fibres coupled to the photomultiplier tubes (PMTs). The analogue signals from the PMTs are amplified, shaped, digitized by sampling the signal every 25 ns and stored on detector until a trigger decision is received. The TileCal front-end electronics reads out the signals produced by about 10000 channels measuring energies ranging from about 30 MeV to about 2 TeV. Each stage of the signal production from scintillation light to the signal reconstruction is monitored and calibrated. During LHC Run-2, high-momentum isolated muons have been used to study and validate the electromagnetic scale, while hadronic response has been probed with isolated hadrons. The calorimeter time resolution has been studied with multi-jet events. First results using early LHC Run-3 data will be shown. A summary of the performance results, including the calibration, stability, absolute energy scale, uniformity and time resolution, will be presented

Energy response of ATLAS Tile Calorimeter to isolated muons

The ATLAS hadronic Tile Calorimeter (TileCal) is one of the sub-systems of the ATLAS detector installed at the LHC at CERN. The calorimeter is composed of alternating iron plates and plastic scintillating tiles. Our study aims to determine the azimuthal uniformity of the energy response and intercalibration of the TileCal longitudinal layers using isolated muons originating from p-p collisions. The muons from the decay of the W bosons are selected. This particular decay is chosen because of its high cross-section and clean signature. The response of the individual TileCal cells is quantified by measuring the ratio of the energy deposited by a muon in a given cell (dE) to the corresponding path length (dx). The distribution of dE/dx follows the well-known Landau distribution. To cancel out various systematic effects, our analysis uses the truncated mean of the dE/dx distribution obtained from the data divided by the truncated mean from the Monte Carlo simulation samples. Results using 2022 and 2023 data will be shown

Energy response of ATLAS Tile Calorimeter to isolated muons

The ATLAS hadronic Tile Calorimeter is one of the sub-systems of the ATLAS detector installed at the LHC. The calorimeter is composed of alternating steel plates and plastic scintillating tiles. Our study aims to determine the uniformity of the energy response using isolated muons produced in the → process. The response of the individual TileCal cells is quantified by measuring the ratio of the energy deposited by a muon in a given cell (Δ) to the corresponding path length (Δ). To cancel out various systematic effects, the analysis uses the truncated mean of the Δ/Δ distribution obtained from the experimental data divided by the same quantity from the Monte Carlo simulation samples. Results using 2022 and 2023 data are shown