The first dedicated Z-boson mass measurement at the LHC with Z → μ+ μ− decays is reported. The dataset uses proton-proton collisions at a centre-of-mass energy of 13 TeV, recorded in 2016 by the LHCb experiment, and corresponds to an integrated luminosity of 1.7 fb^−1. A template fit to the μ+ μ− mass distribution yields the following result for the Z-boson mass: m_Z = 91185.7 ± 8.3 ± 3.9 MeV, where the first uncertainty is statistical and the second systematic. This result is consistent with previous measurements and predictions from global electroweak fits.

Aaij, R., Abdelmotteleb, A. s. w., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. a., et al. (2025). Measurement of the Z-Boson Mass. PHYSICAL REVIEW LETTERS, 135(16), 1-13 [10.1103/ydn7-qx1d].

Measurement of the Z-Boson Mass

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;Zenesini, F.;
2025

Abstract

The first dedicated Z-boson mass measurement at the LHC with Z → μ+ μ− decays is reported. The dataset uses proton-proton collisions at a centre-of-mass energy of 13 TeV, recorded in 2016 by the LHCb experiment, and corresponds to an integrated luminosity of 1.7 fb^−1. A template fit to the μ+ μ− mass distribution yields the following result for the Z-boson mass: m_Z = 91185.7 ± 8.3 ± 3.9 MeV, where the first uncertainty is statistical and the second systematic. This result is consistent with previous measurements and predictions from global electroweak fits.
2025
Aaij, R., Abdelmotteleb, A. s. w., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. a., et al. (2025). Measurement of the Z-Boson Mass. PHYSICAL REVIEW LETTERS, 135(16), 1-13 [10.1103/ydn7-qx1d].
Aaij, R.; Abdelmotteleb, A.  s.  w.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A.  a.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapop...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1036173
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