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.| File | Dimensione | Formato | |
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