Measurement of the vector boson production cross sections at √s = 13.6 TeV with the ATLAS detector

Marinescu, Mihaela ORCID: 0000-0002-4588-3578 (2025). Measurement of the vector boson production cross sections at √s = 13.6 TeV with the ATLAS detector. University of Birmingham. Ph.D.

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Abstract

The measurement of the inclusive W\(^±\) and Z boson production cross sections, and their ratios, are presented using 29 fb\(^−1\) of pp collision data at a centre of mass energy of √s = 13.6 TeV, collected by the ATLAS detector at the Large Hadron Collider (LHC). The measured fiducial cross sections for W\(^+\) → ℓ\(^+\)ν, W\(^−\) → ℓ\(^−\)ν and Z → ℓ\(^+\)ℓ\(^−\) boson production are 4250 ± 150 pb, 3310 ± 120 pb, and 744 ± 20 pb, respectively, where the total uncertainties on the fiducial cross sections are reported. The ratios of top-antitop quark pair to W boson fiducial cross sections are also presented. These measurements are compared to Standard Model predictions calculated at next-to-next-to-leading order in the strong coupling, next-to-next-to-logarithmic accuracy and next-to-leading-order electroweak accuracy, where good agreement is found between the measurements and predictions. The large cross sections of the W\(^±\) and Z bosons, coupled with the clean final states from their leptonic decays, allow excellent experimental precision to be achieved in their measurements.
The upgrade of the ATLAS detector, undertaken in preparation for the third LHC data-taking period currently underway, has led to the improvement of various sub-components of the detector, including the Level-1 Calorimeter Trigger, which now has access to higher granularity information from the electromagnetic calorimeter. A novel set of energy corrections applied to the Level-1 Calorimeter Trigger as a result of this upgrade are also presented in this thesis, which contribute to the increased efficiency of single electron triggers for the ATLAS detector during the third LHC data-taking period.

Type of Work:

Thesis (Doctorates > Ph.D.)

Award Type:

Doctorates > Ph.D.

Supervisor(s):