2019/05/21 by Jacob Linacre, Linacre, Jacob · 1 citation
Physics and Astronomy · #Atlas (anatomy) #Dipole #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Large Hadron Collider #Lepton #Nuclear physics #Particle Detector Development and Performance #Particle physics #Particle physics theoretical and experimental studies #Parton #Phase space #Physics #Physics beyond the Standard Model #Quantum mechanics #Quark #Rest frame #Spin (aerodynamics) #Top quark #hep-ex #hep-ph
paper · pdf · doi:10.48550/arxiv.1905.08634
published in arXiv (Cornell University) (Cornell University) · Contribution to the 2019 EW session of the 54th Rencontres de Moriond
arxiv created 2019/05/21 · openalex publication_date 2019/05/21 · arxiv updated 2019/05/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Measurements of \mathrmtt spin correlations are presented in events with top quarks produced in pp collisions at the LHC. The data correspond to an integrated luminosity of 36 \mathrmfb-1 at √(s)=13 TeV collected at both the ATLAS and CMS detectors. The spin correlations are measured using the angular distributions of the leptons in dilepton channel \mathrmtt events. The spin correlations are probed both directly, using distributions measured in the top quark rest frames that depend only on the top quark spin, and indirectly, using distributions measured in the laboratory frame. The distributions are unfolded to the parton level and extrapolated to the full phase space. Some of the laboratory frame distributions are additionally unfolded to the particle level in the fiducial phase space of the ATLAS detector. The spin correlation measurements are used to search for new physics in the form of a light top squark or an anomalous top quark chromo-magnetic dipole moment, and stringent constraints are placed in both cases.