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Abstract: The tt- charge asymmetry is measured in proton-proton collisions at a centre-of-mass energy of 8 TeV. The data, collected with the CMS experiment at the LHC, correspond to an integrated luminosity of 19.7 fb-1. Selected events contain an electron or a muon and four or more jets, where at least one jet is identified as originating from b-quark hadronization. The inclusive charge asymmetry is found to be 0.0010±0.0068 (stat)±0.0037 (syst). In addition, differential charge asymmetries as a function of rapidity, transverse momentum, and invariant mass of the tt- system are studied. For the first time at the LHC, the measurements are also performed in a reduced fiducial phase space of top quark pair production, with an integrated result of -0.0035±0.0072 (stat)±0.0031 (syst). All measurements are consistent within two standard deviations with zero asymmetry as well as with the predictions of the standard model.
Fuente: Physics Letters B, Vol.757, Pp. 154?179 (2016)
Editorial: Elsevier
Fecha de publicación: 01/06/2016
Nº de páginas: 26
Tipo de publicación: Artículo de Revista
DOI: 10.1016/j.physletb.2016.03.060
ISSN: 0370-2693,1873-2445
Url de la publicación: https://doi.org/10.1016/j.physletb.2016.03.060
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ANA YAIZA RODRIGUEZ MARRERO
ALBERTO RUIZ JIMENO
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