Heidelberg 2022 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

T: Fachverband Teilchenphysik

T 87: Electroweak Interactions (Exp.) 2

T 87.2: Vortrag

Donnerstag, 24. März 2022, 16:35–16:50, T-H18

Measurement of same-sign WW Production at 13 TeV with the ATLAS Experiment — •Shalu Solomon — Albert-Ludwigs University of Freiburg, Germany

The electroweak production of same-sign W boson pairs is one of the pivotal processes to experimentally probe the electroweak symmetry breaking mechanism. With the Standard Model Higgs boson playing a key role in regularising the scattering amplitude of longitudinally polarised W bosons, and thanks to the large electroweak to strong production mode ratio, measuring same-sign WW production is an important tool to understand the electroweak sector.

The analysis of 2015-2016 LHC data at √s = 13 TeV by the ATLAS experiment resulted in the observation of electroweak WW production with a signal significance of 6.5 σ. With the entire Run 2 dataset, corresponding to an integrated luminosity of 139 fb⁻¹, the signal event yield has increased approximately by a factor of four, which gives the potential for the first differential cross-section measurement of this process.

The talk aims to present a summary of the analysis. The estimations of all the major backgrounds along with their uncertainties and behaviour in different validation regions are discussed. Fitting and unfolding methods including closure tests are presented. The expected event yields and the largest uncertainties on the cross-section are also shown.