Precision Measurement of the Z Boson Invisible Width in pp Collisions at √s = 13 TeV

Physics Letters B 2023
Kārlis Dreimanis, Viesturs Veckalns, CMS Collaboration

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 36.3fb−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.

Keywords
CMS Z boson
DOI
10.1016/j.physletb.2022.137563
Hyperlink
https://www.sciencedirect.com/science/article/pii/S0370269322006979?via%3Dihub

The CMS Collaboration, A.Tumasyan, K.Dreimanis, V.Veckalns ... [et al.]. Precision Measurement of the Z Boson Invisible Width in pp Collisions at √s = 13 TeV. Physics Letters B, 2023, Vol. 842, Article number 137563. ISSN 0370-2693. Pieejams: doi:10.1016/j.physletb.2022.137563

Publication language
English (en)