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Abstract:

A measurement of spin correlation in tt¯ production is presented using data collected with the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb-1. The correlation between the top and antitop quark spins is extracted from dilepton tt¯ events by using the difference in the azimuthal angle between the two charged leptons in the laboratory frame. In the helicity basis the measured degree of correlation corresponds to Ahelicity=0.38±0.04, in agreement with the standard model prediction. A search is performed for pair production of top squarks with masses close to the top quark mass decaying to predominantly right-handed top quarks and a light neutralino, the lightest supersymmetric particle. Top squarks with masses between the top quark mass and 191 GeV are excluded at the 95% confidence level. © 2015 CERN.

Registro:

Documento: Artículo
Título:Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at √s =8 TeV Using the ATLAS Detector
Autor:Aad, G. et al.
Este artículo contiene 2878 autores, consultelos en el artículo en formato pdf.
Filiación: Este artículo contiene 2878 autores con sus filiaciones, consultelas en el artículo en formato pdf.
Palabras clave:Elementary particles; Photons; Tellurium compounds; Confidence levels; Degree of correlations; Integrated luminosity; Large Hadron Collider; Lightest supersymmetric particles; Proton proton collisions; Spin correlations; The standard model; High energy physics
Año:2015
Volumen:114
Número:14
DOI: http://dx.doi.org/10.1103/PhysRevLett.114.142001
Título revista:Physical Review Letters
Título revista abreviado:Phys Rev Lett
ISSN:00319007
CODEN:PRLTA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319007_v114_n14_p_Aad

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Citas:

---------- APA ----------
(2015) . Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at √s =8 TeV Using the ATLAS Detector. Physical Review Letters, 114(14).
http://dx.doi.org/10.1103/PhysRevLett.114.142001
---------- CHICAGO ----------
Aad, G. "Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at √s =8 TeV Using the ATLAS Detector" . Physical Review Letters 114, no. 14 (2015).
http://dx.doi.org/10.1103/PhysRevLett.114.142001
---------- MLA ----------
Aad, G. "Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at √s =8 TeV Using the ATLAS Detector" . Physical Review Letters, vol. 114, no. 14, 2015.
http://dx.doi.org/10.1103/PhysRevLett.114.142001
---------- VANCOUVER ----------
Aad, G. Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at √s =8 TeV Using the ATLAS Detector. Phys Rev Lett. 2015;114(14).
http://dx.doi.org/10.1103/PhysRevLett.114.142001