Contribution to a conference proceedings/Contribution to a book

PUBDB-2026-02142

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png First observation of tWZ production

Belvedere, A. (Corresponding author)Extern*

2026
Sissa Medialab Trieste, Italy

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Please use a persistent id in citations: doi:10.22323/1.485.0285  doi:10.3204/PUBDB-2026-02142

Abstract: We present the first observation of single top quark production in association with a W and a Z boson in proton-proton collisions using 13 and 13.6 TeV data recorded with the CMS detector corresponding to integrated luminosities of 138 and 61.9 fb$^{-1}$, respectively. Events are selected if they contain three or four charged leptons, which can be electrons or muons. State-of-the-art machine learning algorithms and sophisticated reconstruction methods result in an unprecedented sensitivity to tWZ production. We report the first observation of this rare process with a significance of more than five standard deviations.

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Contributing Institute(s):

1. LHC/CMS Experiment (CMS)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)

Experiment(s):

1. LHC: CMS

Appears in the scientific report 2026

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