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Título

Measurement of the top quark forward-backward production asymmetry and its dependence on event kinematic properties

Autor Aaltonen, T.; Casal, Bruno ; Cuevas, Javier ; Gómez, G. ; Palencia, Enrique ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Vilar, Rocío ; Vizán, J. ; CDF Collaboration
Fecha de publicación 2013
EditorAmerican Physical Society
Citación Physical Review D 87: 092002 (2013)
ResumenWe present new measurements of the inclusive forward-backward tt̄ production asymmetry, AFB, and its dependence on several properties of the tt̄ system. The measurements are performed with the full Tevatron data set recorded with the CDF II detector during pp̄ collisions at √s=1.96 TeV, corresponding to an integrated luminosity of 9.4 fb -1. We measure the asymmetry using the rapidity difference Δy=yt-yt̄. Parton-level results are derived, yielding an inclusive asymmetry of 0.164±0.047(stat+syst). We establish an approximately linear dependence of AFB on the top-quark pair mass Mtt̄ and the rapidity difference |Δy| at detector and parton levels. Assuming the standard model, the probabilities to observe the measured values or larger for the detector-level dependencies are 7.4×10-3 and 2.2×10-3 for Mtt̄ and |Δy| respectively. Lastly, we study the dependence of the asymmetry on the transverse momentum of the tt̄ system at the detector level. These results are consistent with previous lower-precision measurements and provide additional quantification of the functional dependencies of the asymmetry.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevD.87.092002
URI http://hdl.handle.net/10261/109383
DOI10.1103/PhysRevD.87.092002
Identificadoresdoi: 10.1103/PhysRevD.87.092002
issn: 1550-7998
e-issn: 1550-2368
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