We present new measurements of the inclusive forward-backward t (y) over bar production asymmetry, A(FB), and its dependence on several properties of the t (t) over bar system. The measurements are performed with the full Tevatron data set recorded with the CDF II detector during p (p) over bar collisions at root s = 1.96 TeV, corresponding to an integrated luminosity of 9.4 fb(-1). We measure the asymmetry using the rapidity difference Delta y = y(t) - y((t) over bar) 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 M-t (t) over bar and the rapidity difference vertical bar Delta y vertical bar 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 x 10(-3) and 2.2 x 10(-3) for M-tt and vertical bar Delta y vertical bar respectively. Lastly, we study the dependence of the asymmetry on the transverse momentum of the t (t) over bar 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.

T., A., S., A., D., A., A., A., A., A., J., A., et al. (2013). Measurement of the top quark forward-backward production asymmetry and its dependence on event kinematic properties. PHYSICAL REVIEW. D. PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 87(9) [10.1103/PhysRevD.87.092002].

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

BARRIA, PATRIZIA;GAROSI, PAOLA;MAESTRO, PAOLO;RUFFINI, FABRIZIO;
2013-01-01

Abstract

We present new measurements of the inclusive forward-backward t (y) over bar production asymmetry, A(FB), and its dependence on several properties of the t (t) over bar system. The measurements are performed with the full Tevatron data set recorded with the CDF II detector during p (p) over bar collisions at root s = 1.96 TeV, corresponding to an integrated luminosity of 9.4 fb(-1). We measure the asymmetry using the rapidity difference Delta y = y(t) - y((t) over bar) 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 M-t (t) over bar and the rapidity difference vertical bar Delta y vertical bar 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 x 10(-3) and 2.2 x 10(-3) for M-tt and vertical bar Delta y vertical bar respectively. Lastly, we study the dependence of the asymmetry on the transverse momentum of the t (t) over bar 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.
2013
T., A., S., A., D., A., A., A., A., A., J., A., et al. (2013). Measurement of the top quark forward-backward production asymmetry and its dependence on event kinematic properties. PHYSICAL REVIEW. D. PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 87(9) [10.1103/PhysRevD.87.092002].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/45665
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