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T: Fachverband Teilchenphysik

T 70: Kalorimeter II

T 70.7: Vortrag

Mittwoch, 2. März 2016, 18:15–18:30, VMP6 HS E

NA62 Hadronic calorimeters performance in 2015 data taking — •Letizia Peruzzo for the NA62 collaboration — Institut für Physik JGU Mainz

In June 2015 the NA62 experiment at CERN began its physics data taking with the aim to collect in three years around 100 K⁺→π⁺νν events and measure the branching ratio with a precision about 10%. Well predicted inside the Standard Model, Br(K⁺→π⁺νν)=(9.11±0.72)·10⁻¹¹, this decay is closely related to the CKM matrix elements |V_td| and |V_ts| and any deviation from the theoretical Br could open many scenarios of physics beyond the Standard Model. Only 7 candidates with large background were detected by a previous experiment at BNL. For this reason the NA62 experiment will reduce the background coming from the main K⁺ decays as much as possible. In particular the misidentification of µ⁺ as π⁺ needs to be minimized. The NA62 hadronic calorimeters, called Muon Veto1&2, have then a double task: suppressing those decays with muons in the final state at trigger level and taking part in the full particle identification system. This talk describes and presents the results from the MUV1&2 detectors in the 2015 NA62 data taking.