Journal article
Measurement of the leptonic asymmetry in tt̄ events produced in pp̄ collisions at √s=1.96 TeV
T Aaltonen, S Amerio, D Amidei, A Anastassov, A Annovi, J Antos, G Apollinari, JA Appel, T Arisawa, A Artikov, J Asaadi, W Ashmanskas, B Auerbach, A Aurisano, F Azfar, W Badgett, T Bae, A Barbaro-Galtieri, VE Barnes, BA Barnett Show all
Physical Review D Particles Fields Gravitation and Cosmology | AMER PHYSICAL SOC | Published : 2013
Abstract
We measure the asymmetry in the charge-weighted rapidity qyℓ of the lepton in semileptonic tt̄ decays recorded with the CDF II detector using the full Tevatron Run II sample, corresponding to an integrated luminosity of 9.4 fb-1. A parametrization of the asymmetry as a function of qyℓ is used to correct for the finite acceptance of the detector and recover the production-level asymmetry. The result of AFBℓ=0.094-0.029+0.032 is to be compared to the standard model next-to-leading-order prediction of AFBℓ=0.038±0.003. © 2013 American Physical Society.
Grants
Awarded by European Commission
Funding Acknowledgements
We acknowledge the kind assistance of A. Falkowski and T. Tait in the construction of the Octet models as well as W. Bernreuther and G. Perez for helpful discussion. We thank the Fermilab staff and the technical staffs of the participating institutions for their vital contributions. This work was supported by the U.S. Department of Energy and National Science Foundation; the Italian Istituto Nazionale di Fisica Nucleare; the Ministry of Education, Culture, Sports, Science and Technology of Japan; the Natural Sciences and Engineering Research Council of Canada; the National Science Council of the Republic of China; the Swiss National Science Foundation; the A.P. Sloan Foundation; the Bundesministerium fur Bildung und Forschung, Germany; the Korean World Class University Program, the National Research Foundation of Korea; the Science and Technology Facilities Council and the Royal Society, U.K.; the Russian Foundation for Basic Research; the Ministerio de Ciencia e Innovacion, and Programa Consolider-Ingenio 2010, Spain; the Slovak R&D Agency; the Academy of Finland; the Australian Research Council (ARC); and the EU community Marie Curie Fellowship Contract No. 302103.