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Probing polarised production of two same-charge W± bosons produced in association with two jets with the ATLAS detector

Abstract:
The Standard Model’s electroweak symmetry breaking mechanism describes the nature of longitudinally polarised weak bosons. The Standard Model also predicts a special class of interactions involving weak bosons, which include quartic and trilinear vertices, referred to as Vector Boson Scattering (VBS). Experimental measurements of polarised VBS test both the gauge structure of the electroweak sector and the electroweak symmetry breaking mechanism. Furthermore, the cross-section for longitudinally polarised VBS is highly sensitive to the Higgs couplings and the gauge-boson self-couplings; the cross-section for longitudinally polarised VBS diverges without exact cancellations from interactions with the Higgs boson.

This thesis presents an experiment probing the nature of polarised VBS at the Large Hadron Collider. The experiment measures the fiducial cross-section for the electroweak production of two polarised same-sign W bosons in association with two jets. The cross-section is measured in the leptonic decay channels of the W bosons. The measurement is performed using 139 fb−1 of proton-proton collision data at a centre-of-mass energy √s= 13 TeV recorded by the ATLAS detector.

The experiment measures the electroweak production of two-same sign W bosons, with at least one longitudinally polarised boson in the W boson and proton-proton centre-of-mass frames, with an observed (expected) significance of 3.73 (4.20) and 3.13 (3.59) standard deviations, respectively. The experiment also measures, at a 95% confidence upper limit, the observed (expected) cross-sections for the electroweak production of two longitudinally polarised same-sign W bosons in the W boson and proton-proton centre-of-mass frames as 0.617 (0.710) fb and 0.569 (0.648) fb, respectively.

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Institution:
University of Oxford
Division:
MPLS
Department:
Physics
Sub department:
Particle Physics
Oxford college:
St Hilda's College
Role:
Author

Contributors

Institution:
University of Oxford
Division:
MPLS
Department:
Physics
Role:
Supervisor
ORCID:
0000-0001-7839-9785
Institution:
University of Oxford
Division:
MPLS
Department:
Physics
Role:
Supervisor
ORCID:
0000-0003-2371-9723

DOI:
Type of award:
DPhil
Level of award:
Doctoral
Awarding institution:
University of Oxford

Language:
English
Deposit date:
2025-10-20
ARK identifier:

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