Measurement of the leptonic asymmetry in ttbar events produced in ppbar collisions at sqrt(s)=1.96 TeV
CDF Collaboration: T. Aaltonen, S. Amerio, D. Amidei, A. Anastassov,, A. Annovi, J. Antos, G. Apollinari, J.A. Appel, T. Arisawa, A. Artikov, J., Asaadi, W. Ashmanskas, B. Auerbach, A. Aurisano, F. Azfar, W. Badgett, T., Bae, A. Barbaro-Galtieri, V.E. Barnes, B.A. Barnett
TL;DR
This paper measures the leptonic asymmetry in top-antitop quark events at the Tevatron, finding a value slightly higher than the Standard Model prediction, using data from the CDF II detector.
Contribution
First measurement of leptonic asymmetry in ttbar events at Tevatron, correcting for detector acceptance to compare with Standard Model predictions.
Findings
Measured asymmetry afb(lep) = 0.094 +0.032 -0.029
Compared to SM prediction of 0.038 +-0.003
Results suggest a possible deviation from the Standard Model
Abstract
We measure the asymmetry in the charge-weighted rapidity of the lepton in semileptonic ttbar decays recorded with the CDF II detector using the full Tevatron Run II sample, corresponding to an integrated luminosity of 9.4/fb. A parametrization of the asymmetry as a function of the charge-weighted rapidity is used to correct for the finite acceptance of the detector and recover the production-level asymmetry. The result of afb(lep) = 0.094 +0.032 -0.029 is to be compared to the standard model next-to-leading-order prediction of afb(lep) = 0.038 +-0.003.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.