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Measurements of t t ̄ spin correlations and top-quark polarization using dilepton final states in pp collisions at √s =7TeV

AutorChatrchyan, S.; Brochero Cifuentes, J. A. ; Cabrillo, I. J. ; Cabrillo, I. J. ; Calderon, Alicia ; Chuang, S. H. ; Duarte Campderros, J. ; Fernández, M. ; Gómez, G. ; González Sánchez, J. ; Graziano, A. ; López Virto, A. ; Marco, Jesús ; Marco, Rafael ; Martínez-Rivero, Celso ; Matorras, Francisco ; Muñoz Sánchez, F. J. ; Piedra, Jonatan ; Rodrigo, Teresa ; Rodríguez Marrero, Ana Y. ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Vila, Iván ; Vilar, Rocío ; CMS Collaboration
Fecha de publicación2014
EditorAmerican Physical Society
CitaciónPhysical Review Letters 112: 182001 (2014)
ResumenSpin correlations and polarization in the top quark–antiquark system are measured using dilepton final states produced in pp collisions at the LHC at s=7  TeV. The data correspond to an integrated luminosity of 5.0  fb−1 collected with the CMS detector. The measurements are performed using events with two oppositely charged leptons (electrons or muons), a significant imbalance in transverse momentum, and two or more jets, where at least one of the jets is identified as originating from a b quark. The spin correlations and polarization are measured through asymmetries in angular distributions of the two selected leptons, unfolded to the parton level. All measurements are found to be in agreement with predictions of the standard model-
DescripciónThis article is available under the terms of the Creative Commons Attribution 3.0 License.-- et al.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevLett.112.182001
URIhttp://hdl.handle.net/10261/110237
DOI10.1103/PhysRevLett.112.182001
Identificadoresdoi: 10.1103/PhysRevLett.112.182001
e-issn: 1079-7114
issn: 0031-9007
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