The trigger system for the MEG II experiment

Francesconi, M.; Baldini, A.; Ban, S.; Benmansour, H.; Cattaneo, P. W.; Cei, F.; Chiappini, M.; Chiarello, G.; Galli, L.; Gatti, F.; Gerone, M. De; Grassi, M.; Hartmann, U.; Iwamoto, Toshiyuki; Kobayashi, Satoru; Matsushita, Ayaka; Morsani, F.; Nicoló, D.; Onda, Rina; Ootani, Wataru; Oya, Atsushi; Papa, A.; Ritt, S.; Rossella, M.; Schmid, Elmar; Signorelli, G.; Uchiyama, Y.; Venturini, A.; Vitali, B.; Yonemoto, Taku; Yoshida, Keisuke

doi:10.1016/j.nima.2022.167736

Cited by 1 publication

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References 14 publications

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“…The overall trigger efficiency [4,14] for the 2021 dataset was therefore approximately 80%, with dependence on the different data-taking conditions. In particular, the efficiency decreased when the threshold had to be tightened to cope with the increase in muon rate.…”

Section: Data Set and First Meg II Resultsmentioning

confidence: 99%

Status of the MEG II experiment

Francesconi

2024

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2023)

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The MEG II experiment, which focuses on investigating Charged Lepton Flavour Violation in muon decays, completed the commissioning of all subdetectors in time for the 2021 run and it is currently collecting its third year of beam time at the Paul Scherrer Institut (CH). The experimental apparatus has been specifically designed to search for 𝜇 + → 𝑒 + 𝛾 decay, aiming at improving the limit on the branching ratio from the current 4.2 × 10 −13 at 90% confidence level set by the former MEG experiment. This requires high-performance and lightweight detectors capable of handling the pileup effect from world most intense continuous 𝜇 + beam. This contribution provides a brief overview of the experimental techniques employed and then focuses on the description of the collected datasets and analysis strategy. Although we accumulated only a few weeks of data in 2021, the experiment already has a sensitivity of 8.8 × 10 −13 to the 𝜇 + → 𝑒 + 𝛾 branching ratio, with analysis strongly limited by available statistics. In the months following the conference, that dataset was unblinded and the limit was set at 7.5 × 10 −13 . The combination of this with the existing limit yields the current best exclusion of 𝜇 + → 𝑒 + 𝛾 process with a limit in branching ratio of 3.1 × 10 −13 at 90% confidence level. Finally, MEG II data-taking is expected to continue until the end of 2026, to achieve its final sensitivity of 6 × 10 −14 .

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Section: Data Set and First Meg II Resultsmentioning

confidence: 99%

Status of the MEG II experiment

Francesconi

2024

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2023)

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The trigger system for the MEG II experiment

Cited by 1 publication

References 14 publications

Status of the MEG II experiment

Status of the MEG II experiment

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