Measurements of top-quark pair spin correlations in the $$e\mu $$ channel at $$\sqrt{s} = 13$$ TeV using pp collisions in the ATLAS detector

descriptionPublicationkeyboard_double_arrow_right Article , Research , Preprint 01 Aug 2020Embargo end date: 19 Aug 2020 Netherlands, Norway, Sweden, Norway, Italy, Netherlands, Netherlands, Netherlands, Portugal, Belarus, United Kingdom, Italy, Switzerland, China (People's Republic of), Germany, Spain, Turkey, Italy, China (People's Republic of), Italy, France, Italy, Australia, Australia, Denmark, Spain, Italy, Italy, United Kingdom, United States, Italy, Italy, China (People's Republic of), Italy, Italy, Italy, Italy, Austria, United Kingdom, South Africa, Germany, United Kingdom, Chile, Italy English Publisher:Springer Science and Business Media LLCJournal:The European Physical Journal C, volume 80 (issn: 1434-6044, eissn: 1434-6052,

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Authors: Aaboud, Morad; Aad, Georges; Abramowicz, Halina; Araujo Pereira, Rodrigo; Hadef, Asma; Hageboeck, Stephan; Hagihara, Mutsuto; +193 Authors

Aaboud, Morad; Aad, Georges; Abramowicz, Halina; Araujo Pereira, Rodrigo; Hadef, Asma; Hageboeck, Stephan; Hagihara, Mutsuto; Haleem, Mahsana; Haley, Joseph; Halladjian, Garabed; Hallewell, Gregory David; Hamacher, Klaus; Hamal, Petr; Hamano, Kenji; Arce, Ayana; Hamdaoui, Hassane; Hamity, Guillermo Nicolas; Han, Kunlin; Han, Liang; Han, Shuo; Hanagaki, Kazunori; Hance, Michael; Handl, David Michael; Haney, Bijan; Hankache, Robert; Arduh, Francisco Anuar; Hanke, Paul; Hansen, Eva; Hansen, Jorgen Beck; Hansen, Jorn Dines; Hansen, Maike Christina; Hansen, Peter Henrik; Hanson, Emily Claire; Hara, Kazuhiko; Hard, Andrew Straiton; Harenberg, Torsten; Arguin, Jean-Francois; Harkusha, Siarhei; Harrison, Paul Fraser; Hartmann, Nikolai Marcel; Hasegawa, Yoji; Hasib, Ahmed; Hassani, Samira; Haug, Sigve; Hauser, Reiner; Hauswald, Lorenz; Havener, Laura Brittany; Argyropoulos, Spyridon; Havranek, Miroslav; Hawkes, Christopher; Hawkings, Richard; Hayden, Daniel; Hayes, Christopher; Hayes, Robin Leigh; Hays, Chris; Hays, Jonathan Michael; Hayward, Helen; Haywood, Stephen; Arling, Jan-Hendrik; He, Fudong; Heath, Matthew Peter; Hedberg, Vincent; Heelan, Louise; Heer, Sebastian; Heidegger, Kim Katrin; Heilman, Jesse; Heim, Sarah; Heim, Timon Frank-thomas; Heinemann, Beate; Armbruster, Aaron James; Heinrich, Jochen Jens; Heinrich, Lukas; Heinz, Christian; Hejbal, Jiri; Helary, Louis; Held, Alexander; Hellesund, Simen; Helling, Cole Michael; Hellman, Sten; Helsens, Clement; Armitage, Lewis James; Henderson, Robert; Heng, Yang; Henkelmann, Steffen; Henriques Correia, Ana Maria; Herbert, Geoffrey Henry; Herde, Hannah; Herget, Verena; Hernandez Jimenez, Yesenia; Herr, Holger; Herrmann, Maximilian Georg; Armstrong, Alexander III; Herrmann, Tim; Herten, Gregor; Hertenberger, Ralf; Hervas, Luis; Herwig, Theodor Christian; Hesketh, Gavin Grant; Hessey, Nigel; Higashida, Akihiro; Higashino, Satoshi; Higon-Rodriguez, Emilio; Arnaez, Olivier; Hildebrand, Kevin; Hill, Ewan; Hill, John; Hill, Kurt Keys; Hiller, Karl Heinz; Hillier, Stephen; Hils, Maximilian; Hinchliffe, Ian; Hinterkeuser, Florian; Hirose, Minoru; Abreu, Henso; Arnold, Hannah; Hirose, Shigeki; Hirschbuehl, Dominic; Hiti, Bojan; Hladik, Ondrej; Hlaluku, Dingane Reward; Hoad, Xanthe; Hobbs, John; Hod, Noam; Hodgkinson, Mark; Hoecker, Andreas; Artamonov, Andrei; Hoenig, Friedrich; Hohn, David; Hohov, Dmytro; Holmes, Tova Ray; Holzbock, Michael; Hommels, Bart; Honda, Shunsuke; Honda, Takuya; Hong, Tae Min; Honle, Andreas; Artoni, Giacomo; Hooberman, Benjamin Henry; Hopkins, Walter Howard; Horii, Yasuyuki; Horn, Philipp; Horton, Arthur James; Horyn, Lesya Anna; Hostachy, Jean-Yves; Hostiuc, Alexandru; Hou, Suen; Hoummada, Abdeslam; Artz, Sebastian; Howarth, James; Hoya, Joaquin; Hrabovsky, Miroslav; Hrdinka, Julia; Hristova, Ivana; Hrivnac, Julius; Hrynevich, Aliaksei; Hryn'ova, Tetiana; Hsu, Pai-hsien Jennifer; Hsu, Shih-Chieh; Asai, Shoji; Hu, Qipeng; Hu, Shuyang; Huang, Yanping; Hubacek, Zdenek; Hubaut, Fabrice; Huebner, Michael; Huegging, Fabian; Huffman, Todd Brian; Huhtinen, Mika; Hunter, Robert Francis; Asbah, Nedaa; Huo, Peng; Hupe, Andre Marc; Huseynov, Nazim; Huston, Joey; Huth, John; Hyneman, Rachel; Hyrych, Sofiia; Iacobucci, Giuseppe; Iakovidis, Georgios; Ibragimov, Iskander; Asimakopoulou, Eleni Myrto; Iconomidou-Fayard, Lydia; Idrissi, Zineb; Iengo, Paolo; Ignazzi, Rosanna; Igonkina, Olga; Iguchi, Ryunosuke; Iizawa, Tomoya; Ikegami, Yoichi; Ikeno, Masahiro; Iliadis, Dimitrios; Asquith, Lily; Ilic, Nikolina; Iltzsche Speiser, Franziska; Introzzi, Gianluca; Iodice, Mauro; Iordanidou, Kalliopi; Ippolito, Valerio; Isacson, Max Fredrik; Ishijima, Naoki;

doi: 10.1140/epjc/s10052-020-8181-6 , 10.17863/cam.56454 , 10.3204/pubdb-2020-05002 , 10.17863/cam.74395 , 10.17863/cam.57068 , 10.17863/cam.58143 , 10.48550/arxiv.1903.07570 , 10.3204/pubdb-2019-05319 , 10.17863/cam.56877

arXiv: 1903.07570

Measurements of top-quark pair spin correlations in the $$e\mu $$ channel at $$\sqrt{s} = 13$$ TeV using pp collisions in the ATLAS detector

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Abstract

AbstractA measurement of observables sensitive to spin correlations in $$t\bar{t}$$tt¯ production is presented, using 36.1 $$\hbox {fb}^{-1}$$fb-1 of pp collision data at $$\sqrt{s} = 13$$s=13 TeV recorded with the ATLAS detector at the Large Hadron Collider. Differential cross-sections are measured in events with exactly one electron and one muon with opposite-sign electric charge as a function of the azimuthal opening angle and the absolute difference in pseudorapidity between the electron and muon candidates in the laboratory frame. The azimuthal opening angle is also measured as a function of the invariant mass of the $$t\bar{t}$$tt¯ system. The measured differential cross-sections are compared to predictions by several NLO Monte Carlo generators and fixed-order calculations. The observed degree of spin correlation is somewhat higher than predicted by the generators used. The data are consistent with the prediction of one of the fixed-order calculations at NLO, but agree less well with higher-order predictions. Using these leptonic observables, a search is performed for pair production of supersymmetric top squarks decaying into Standard Model top quarks and light neutralinos. Top squark masses between 170 and 230 GeV are largely excluded at the 95% confidence level for kinematically allowed values of the neutralino mass.

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Netherlands, Norway, Sweden, Norway, Italy, Netherlands, Netherlands, Netherlands, Portugal, Belarus, United Kingdom, Italy, Switzerland, China (People's Republic of), Germany, Spain, Turkey, Italy, China (People's Republic of), Italy, France, Italy, Australia, Australia, Denmark, Spain, Italy, Italy, United Kingdom, United States, Italy, Italy, China (People's Republic of), Italy, Italy, Italy, Italy, Austria, United Kingdom, South Africa, Germany, United Kingdom, Chile, Italy

Related Organizations

Chinese University of Hong Kong
China (People's Republic of)
University of Manchester
United Kingdom
Tufts University
United States
Indiana University
United States
Parthenope University of Naples
Italy

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Keywords

neutralino: mass, 13000 GeV-cms, Atomic, rapidity dependence, Subatomär fysik, ЭБ БГУ::ТЕХНИЧЕСКИЕ И ПРИКЛАДНЫЕ НАУКИ. ОТРАСЛИ ЭКОНОМИКИ::Ядерная техника, Particle and Plasma Physics, particle physics; lhc; standard model, Boson, 5107 Particle and high energy physics (for-2020), info:eu-repo/classification/ddc/530, TEVATRON, 5107 Particle and High Energy Physics (for-2020), 51 Physical Sciences (for-2020), ddc:530, Particle physics, VDP::Kjerne- og elementærpartikkelfysikk: 431, Higgs Bosons, LEPTON SPECTRA, Differential cross section: measured, mass dependence, Settore FIS/01 - FISICA SPERIMENTALE, angular dependence, CERN LHC Coll, kinematics, Physical Sciences, Rapidity dependence, Mass dependence, top: pair production, numerical calculations: Monte Carlo, 51 Physical Sciences, stop: pair production, p p: scattering, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], spin: correlation, 610, molecular and optical physics (for-2020), LHC, ATLAS, High Energy Physics, Angular dependence, S046STP, muon, High Energy Physics, molecular and optical physics, mass spectrum: (2top), final state: ((n)jet dilepton), P p: colliding beams, 500, Molecular, Nuclear & Particles Physics (science-metrix), Experimental High Energy Physics, Supersymmetry, Stop: pair production, p p: colliding beams, electron, :Kjerne- og elementærpartikkelfysikk: 431 [VDP], Kinematics, Muon, 5106 Nuclear and Plasma Physics (for-2020), 510, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Subatomic Physics, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], stop: mass: lower limit, Partons, Quantum Physics, Stop: mass: lower limit, Particle and High Energy Physics, 0206 Quantum Physics (for), ATLAS, Nuclear and Plasma Physics, Nuclear & Particles Physics, :Nuclear and elementary particle physics: 431 [VDP], P p: scattering, VDP::Nuclear and elementary particle physics: 431, 5107 Particle and High Energy Physics, Regular Article - Experimental Physics, squark: mass, Particle and Plasma Physics (for), Charge: electric, FOS: Physical sciences, Top Quark, Electron, 530, Mass spectrum: (2top), differential cross section: measured, 5102 Atomic, Nuclear, Experimental results, High energy physics, Top: pair production, ЭБ БГУ::ЕСТЕСТВЕННЫЕ И ТОЧНЫЕ НАУКИ::Физика, 5101 Astronomical sciences (for-2020), hep-ex, Numerical calculations: Monte Carlo, charge: electric, Spin: correlation, Física, Squark: mass, Neutralino: mass, rapidity, Astronomical sciences, 0202 Atomic, Rapidity, 5106 Nuclear and Plasma Physics, supersymmetry, DECAY, 500.2, experimental results

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