Measurements of top quark spin observables in tt events are presented based on 20.2 fb1 of p s = 8TeV proton-proton collisions recorded with the ATLAS detector at the LHC. The analysis is performed in the dilepton nal state, characterised by the presence of two isolated leptons (electrons or muons). There are 15 observables, each sensitive to a dierent coecient of the spin density matrix of tt production, which are measured independently. Ten of these observables are measured for the rst time. All of them are corrected for detector resolution and acceptance eects back to the parton and stable-particle levels. The measured values of the observables at parton level are compared to Standard Model predictions at next-to-leading order in QCD. The corrected distributions at stable-particle level are presented and the means of the distributions are compared to Monte Carlo predictions. No signicant deviation from the Standard Model is observed for any observable.

M. Aaboud, G.A. (2017). Measurements of top quark spin observables in tt¯ events using dilepton final states in √s=8 TeV pp collisions with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2017(3), 113-1-113-50 [10.1007/JHEP03(2017)113].

Measurements of top quark spin observables in tt¯ events using dilepton final states in √s=8 TeV pp collisions with the ATLAS detector

G. L. Alberghi;L. Bellagamba;S. Biondi;D. Boscherini;A. Bruni;G. Bruni;G. D’amen;S. De Castro;F. Fabbri;L. Fabbri;M. Franchini;A. Gabrielli;B. Giacobbe;F. Lasagni Manghi;L. Massa;A. Mengarelli;A. Polini;L. Rinaldi;M. Romano;C. Sbarra;N. Semprini-Cesari;M. Sioli;R. Spighi;G. Ucchielli;M. Villa;C. Vittori;I. Vivarelli;A. Zoccoli;
2017

Abstract

Measurements of top quark spin observables in tt events are presented based on 20.2 fb1 of p s = 8TeV proton-proton collisions recorded with the ATLAS detector at the LHC. The analysis is performed in the dilepton nal state, characterised by the presence of two isolated leptons (electrons or muons). There are 15 observables, each sensitive to a dierent coecient of the spin density matrix of tt production, which are measured independently. Ten of these observables are measured for the rst time. All of them are corrected for detector resolution and acceptance eects back to the parton and stable-particle levels. The measured values of the observables at parton level are compared to Standard Model predictions at next-to-leading order in QCD. The corrected distributions at stable-particle level are presented and the means of the distributions are compared to Monte Carlo predictions. No signicant deviation from the Standard Model is observed for any observable.
2017
M. Aaboud, G.A. (2017). Measurements of top quark spin observables in tt¯ events using dilepton final states in √s=8 TeV pp collisions with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2017(3), 113-1-113-50 [10.1007/JHEP03(2017)113].
M. Aaboud, G. Aad, B. Abbott, J. Abdallah, O. Abdinov, B. Abeloos, O. S. AbouZeid, N. L. Abraham, H. Abramowicz, H. Abreu, R. Abreu, Y. Abulaiti, B. S...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/621544
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