München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 7: Instrumentation I

HK 7.3: Talk

Monday, March 18, 2019, 14:45–15:00, HS 11

Study on two-track separation power of triple GEM detectors at the NA64 Experiment — •Michael Hösgen, Markus Ball, Nabeel Ahmed, and Bernhard Ketzer for the NA64 collaboration — Helmholtz-Institut für Strahlen- und Kernphysik

The NA64 experiment uses an active target beam dump setup to conduct missing energy searches. It utilizes a high-intensity energy beam of 100 GeV energy at the SPS of CERN.

Between 2016 and 2018 a dedicated search for a new short-lived neutral boson X was performed. The X could be produced in Bremsstrahlung interactions e⁻Z→ e⁻ZX in the active target tungsten electromagnetic calorimeter and decay into standard-model leptons (X → e⁺e⁻). In order to record the two resulting tracks, which are emitted with a very small opening angle, four GEM detectors, each delivering two proections, were installed behind the active target.

The two-track separation power of the GEM detectors is evaluated by superimposing single-track events as well as by studying one of the well known background channels, which is the production of a µ⁺µ⁻- pair in the electromagnetic shower.

The talk will present the setup and discuss the results of these studies.