Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 56: Electroweak Physics II (Multi-boson Processes)
T 56.3: Vortrag
Mittwoch, 2. April 2025, 16:45–17:00, VG 2.103
Measurement of the differential di-boson cross-section in semileptonic final states at √s = 13 TeV in 140 fb−1 of p p collisions with the ATLAS detector — •Anubhav Gupta, Chris Malena Delitzsch, and Amartya Rej — Otto-Hahn-Str. 4A 44227 Dortmund
The measurement of electroweak vector boson pair (VV) production cross-sections is a critical test of the Standard Model (SM), probing electroweak boson self-interactions and the electroweak theory. While VV production has been well-studied in fully leptonic decay channels at √s = 13 TeV, semileptonic channels have only been measured at √s = 8 TeV.
This analysis presents the first measurement of di-boson production in the semileptonic channel (leptons and a large radius jet) at √s = 13 TeV, taking advantage of its higher branching fraction compared to fully leptonic decays and a cleaner signature than fully hadronic decays. The semileptonic channel is particularly sensitive at high energies, offering strong potential for detecting new physics beyond the SM in the tails of kinematic distributions.
The study includes particle-level inclusive and differential cross-section measurements, along with constraints on dimension-6 Effective Field Theory (EFT) operators in the Warsaw basis, affecting electroweak triple gauge couplings, at the folded level.
Keywords: Electroweak interactions; Di-boson production; Semileptonic decay; Cross-section measurement; Effective Field Theory (EFT)