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Tau identification in CMS during LHC Run 2

by Mohammad Hassan Hassanshahi on behalf of the CMS Collaboration

Submission summary

Authors (as registered SciPost users): Mohammad Hassan Hassanshahi
Submission information
Preprint Link: scipost_202111_00040v1  (pdf)
Date submitted: 2021-11-22 11:09
Submitted by: Hassanshahi, Mohammad Hassan
Submitted to: SciPost Physics Proceedings
Proceedings issue: 16th International Workshop on Tau Lepton Physics (TAU2021)
Ontological classification
Academic field: Physics
  • High-Energy Physics - Experiment
Approach: Experimental


The LHC Run 2 data-taking period was characterized by an increase in instantaneous luminosity and center-of-mass energy. Several techniques have been deployed in the CMS experiment to reconstruct and identify tau leptons in this environment. The Deep-Tau identification algorithm is used to identify hadronically decaying tau leptons from quark and gluon induced jets, electrons, and muons. Compared to previously used MVA identification algorithms, the use of deep-learning techniques brought a noticeable improvement in the tau identification and rejection of contaminating sources. Low transverse momentum topologies were addressed separately with a dedicated identification algorithm, while machine learning techniques were implemented to improve the identification of the tau hadronic decay channels. These algorithms have been already used for several published physics analyses in CMS. The algorithms are presented together with their measured performances.

Current status:
In refereeing

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Submission scipost_202111_00040v1 on 22 November 2021

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