Apr 19 – 21, 2017
Trieste - Italia
Europe/Rome timezone
Proceedings: Il Nuovo Cimento C, Vol. 41, N. 1-2, 2018 : https://www.sif.it/riviste/sif/ncc/econtents/2018/041/01-02

NA62 High Level Trigger strategy

Apr 21, 2017, 5:00 PM
Aula Magna - Edificio H3 (Trieste - Italia)

Aula Magna - Edificio H3

Trieste - Italia

Università degli Studi di Trieste Via Valerio nº 12/2 I-34127 Trieste (TS)
Poster contribution Sessione Frontiera Intensità Archivio Poster


Marco Boretto (TO)


The NA62 is a fixed target experiment located at CERN Super Proton Synchrotron (SPS). The main experiment goal is to measure the K+→π+νν ̄with 10% of accuracy. This decay is a neutral weak current with a quark flavor violation highly suppressed by the GIM mechanism. Its branching ratio is predicted by the Standard Model with unusual precision (estimated to 8.4x10-11). In order to measure this tiny branching ratio a very efficient Trigger and Data Acquisition (TDAQ) chain is mandatory. The event building and the on-line High Level Trigger (HLT) are performed by a small cluster of computer running custom C++ software. The HLT aims at reducing the raw data rate from ~1MHz to ~10KHz and it actually relies on multi track event rejection. The full event is completed with the calorimeter information only if it receives a positive response from the HLT. An overview of the HLT strategy will be presented.

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