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Precision measurement of the Z boson invisible width in pp collisions at s = 13 TeV

Abstract: A precise measurement of the invisible width of the Z boson produced in proton-proton collisions at a center-of-mass energy of 13 TeV is presented using data recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 36.3 fb-1. The result is obtained from a simultaneous fit to kinematic distributions for two data samples of Z boson plus jets: one dominated by Z boson decays to invisible particles and the other by Z boson decays to muon and electron pairs. The invisible width is measured to be 523 ± 3 (stat) ± 16 (syst) MeV. This result is the first precise measurement of the invisible width of the Z boson at a hadron collider, and is the single most precise direct measurement to date, competitive with the combined result of the direct measurements from the LEP experiments.

 Fuente: Physics Letters B, 2023, 842, 137563

 Publisher: Elsevier

 Publication date: 01/07/2023

 No. of pages: 22

 Publication type: Article

 DOI: 10.1016/j.physletb.2022.137563

 ISSN: 0370-2693,1873-2445

 Publication Url: https://doi.org/10.1016/j.physletb.2022.137563