A measurement of the invisible width of the 𝑍 boson using events with jets and missing transverse momentum is presented using 37 fb−1 of 13 TeV proton–proton data collected by the ATLAS detector in 2015 and 2016. The ratio of 𝑍 → inv to 𝑍 → 𝓁𝓁 events, where inv refers to non-detected particles and 𝓁 is either an electron or a muon, is measured and corrected for detector effects. Events with at least one energetic central jet with 𝑝T ≥ 110 GeV are selected for both the 𝑍 → inv and 𝑍 → 𝓁𝓁 final states to obtain a similar phase space in the ratio. The invisible width is measured to be 506 ± 2 (stat.) ± 12 (syst.) MeV and is the single most precise recoil-based measurement. The result is in agreement with the most precise determination from LEP and the Standard Model prediction based on three neutrino generations.

Measurement of the Z boson invisible width at s=13 TeV with the ATLAS detector / G. Aad, B.A.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 854:(2024), pp. 138705.1-138705.25. [10.1016/j.physletb.2024.138705]

Measurement of the Z boson invisible width at s=13 TeV with the ATLAS detector

A. Andreazza;A. Carbone;L. Carminati;S. D'Auria;L. Dell'Asta;M. Fanti;M. Lazzaroni;E. Mazzeo;C. Meroni;A. Murrone;L. Perini;F. Ragusa;A. Stabile;
2024

Abstract

A measurement of the invisible width of the 𝑍 boson using events with jets and missing transverse momentum is presented using 37 fb−1 of 13 TeV proton–proton data collected by the ATLAS detector in 2015 and 2016. The ratio of 𝑍 → inv to 𝑍 → 𝓁𝓁 events, where inv refers to non-detected particles and 𝓁 is either an electron or a muon, is measured and corrected for detector effects. Events with at least one energetic central jet with 𝑝T ≥ 110 GeV are selected for both the 𝑍 → inv and 𝑍 → 𝓁𝓁 final states to obtain a similar phase space in the ratio. The invisible width is measured to be 506 ± 2 (stat.) ± 12 (syst.) MeV and is the single most precise recoil-based measurement. The result is in agreement with the most precise determination from LEP and the Standard Model prediction based on three neutrino generations.
Settore FIS/01 - Fisica Sperimentale
Settore ING-INF/07 - Misure Elettriche e Elettroniche
2024
https://www.sciencedirect.com/science/article/pii/S0370269324002636?via=ihub
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1053688
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