UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2025-08-21 0:30
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Conference: Bucharest University Faculty of Physics 2025 Meeting


Section: Theoretical and Computational Physics, High-Energy Physics, Applied Mathematics


Title:
Precision measurements of the W boson mass: Implications for the Standard Model and future prospects


Authors:
Anca-Maria DINU


Affiliation:
Faculty of Physics, University of Bucharest


E-mail
anca-maria.dinu@s.unibuc.ro


Keywords:
W boson mass, CDF, LHC, uncertainty.


Abstract:
Precision measurements of the W boson mass play a critical role in testing the internal consistency of the electroweak sector of the Standard Model (SM) and probing for signs of physics beyond the Standard Model (BSM). This presentation summarizes recent experimental results regarding the W boson mass, including the unexpected result of the CDF II measurement at Fermilab, which reported a W mass value significantly higher than the SM prediction, with a deviation of 7σ. In comparison, two results from the ATLAS and CMS collaborations at LHC are shown, both of which remain consistent with SM predictions. Experimental challenges and limitations are discussed, as well as future prospects with next-generation lepton colliders such as FCC-ee, which promise an order-of-magnitude improvement in precision and could decisively resolve current tensions and either reaffirm the Standard Model or point towards physics beyond the Standard Model.


References:

[1] ATLAS Collaboration, “Measurement of the W-boson mass and width with the

ATLAS detector using proton-proton collisions at s = 7 TeV”, Eur. Phys. J. C 84,

1309 (2024).

[2] CDF Collaboration, “High-precision measurement of the W boson mass with

the CDF II detector”, Science 376, 170 (2022).

[3] CMS Collaboration, ”High-precision measurement of the W boson mass with

the CMS experiment at the LHC”, 2024, Submitted to Nature.

[4] Paolo Azzurri, ”The W mass and width measurement challenge at FCC-ee”,

Eur. Phys. J. Plus 136, 1203 (2021).

[5] Chih-Ting Lu et al., ”Electroweak Precision Fit and New Physics in light of

Boson Mass”, Physical Review D 106 (2022)

[6] Johannes Haller et al.”Update of the global electroweak fit and constraints on two-Higgs-doublet models”, Eur. Phys. J. C78, 675 (2018)