Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 51: Top Physics III (Cross Sections, Entanglement)
T 51.4: Vortrag
Mittwoch, 2. April 2025, 17:00–17:15, VG 1.103
Towards the measurement of tt spin correlations using dilepton final states in pp collisions at √s = 13 TeV with the ATLAS detector — Diptaparna Biswas1, Beatrice Cervato1, Markus Cristinziani1, Carmen Diez Pardos1, Ivor Fleck1, Arpan Ghosal1, Gabriel Gomes1, Jan Joachim Hahn1, Vadim Kostyukhin1, Nils Krengel1, Buddhadeb Mondal1, Stefanie Müller1, •Sebastian Rentschler1, Elisabeth Schopf1, Katharina Voss1, Wolfgang Walkowiak1, Adam Warnerbring1, and Tongbin Zhao1,2 — 1Experimentelle Teilchenphysik, Center for Particle Physics Siegen, Universität Siegen — 2Shandong University, China
The top quark is the heaviest known elementary particle and it decays before hadronizing. Consequently, measurements of the angular distributions of top quark decay products give access to the spin of the top quark, allowing the precise testing of perturbative QCD in the top quark- antiquark pair (tt) production process. In this contributions first studies towards the measurement of the tt spin correlations are presented using the data collected using proton-protons collisions at a centre-of-mass energy of 13 TeV. The data correspond to an integrated luminosity of 140 fb−1 collected with the ATLAS detector. The measurements are performed using events with two oppositely charged leptons (electrons or muons) and two or more jets, where at least one of the jets is identified as originating from a bottom quark. The spin correlations are measured from the angular distributions of the two selected leptons.
Keywords: Top Quark; Dilepton; Spin; ATLAS