PoS - Proceedings of Science
Volume 450 - The Eleventh Annual Conference on Large Hadron Collider Physics (LHCP2023) - session Poster session
Design and commissioning with first Run 3 data of new triggers to search for the CLFV $\tau \rightarrow 3\mu$ decay at the CMS experiment
C. Aruta*  on behalf of the CMS Collaboration
Full text: pdf
Pre-published on: January 16, 2024
Published on:
A search for the charged lepton flavor violating $\tau \rightarrow 3\mu$ decay was performed by the CMS experiment at the LHC, using data collected in 2017-2018 during proton-proton collisions. This data sample corresponds to an integrated luminosity of 97.7 $\mathrm{fb^{-1}}$, recorded at a center-of-mass energy of 13 TeV. Tau leptons produced by the decays of heavy flavor mesons (B and D) or W bosons are exploited in the analysis, with a tailored strategy designed for the two different cases, and combined for the final result.
No significant excess was observed, and an upper limit on the branching fraction $\mathcal{B}(\tau \rightarrow 3\mu)$ of $3.1 \times 10^{-8}$ at 90% confidence level was set. Finally, this result was combined with the earlier CMS search based on 2016 data, resulting in a final observed (expected) upper limit on $\mathcal{B}(\tau \rightarrow 3\mu)$ of $2.9 \times 10^{-8}\ (2.4 \times 10^{-8})$ at 90% confidence level.
To complement this search, a description of the improved version of the trigger designed for this analysis for the next LHC data taking period, started in 2022, is presented.
DOI: https://doi.org/10.22323/1.450.0275
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.