Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 86: Kalorimeter

T 86.7: Talk

Thursday, March 22, 2018, 18:05–18:20, Z6 - SR 2.002

Muon Pion Separation for the K⁺ → π⁺ ν ν Measurement with the NA62 Experiment — •Riccardo Aliberti — Johannes Gutenberg University - Mainz

The ambitious goal of the NA62 experiment is to achieve a direct measurement of the K⁺ → π⁺ νν branching ratio with an accuracy around 10%. This decay has a theoretical BR of (8.4 ± 1.0 ) × 10⁻¹¹ with a single track detectable: the π⁺.
The main decay channels of charged kaons have rates several orders of magnitude larger than those for the signal. For this reason the presence of a very efficient veto system to reject background events is mandatory.
The discrimination between muons and pions is one of the central issues for the measurement of the K⁺ → π⁺ νν decay. In this context the measurement of the energy deposit inside the hadron calorimeter is one of the most important inputs to the pion-muon separation. This talk presents the procedure of the absolute calibration of the NA62 hadron calorimeter with particular focus on the usage of stopped high-energetic muons to calibrate the electromagnetic response of the detector.