Interpretations and implications of the top quark rapidity asymmetries AFBt and AFBℓ

Edmond L. Berger*, Qing Hong Cao, Chuan Ren Chen, Hao Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Forward-backward asymmetries AFBt and AFBℓ are observed in the top-quark t rapidity distribution and in the rapidity distribution of charged leptons ℓ from top-quark decay at the Tevatron proton-antiproton collider, and a charge asymmetry AC is seen in proton-proton collisions at the Large Hadron Collider (LHC). In this paper, we update our previous studies of the Tevatron asymmetries using the most recent data. We provide expectations for AC at the LHC based first on simple extrapolations from the Tevatron, and second based on new physics models that can explain the Tevatron asymmetries. We examine the relationship of the two asymmetries AFBt and AFBℓ. We show their connection through the (V-A) spin correlation between the charged lepton and the top quark with different polarization states. We show that the ratio of the two asymmetries provides independent insight into the physics interpretation of the top-quark asymmetry. We emphasize the value of the measurement of both asymmetries, and we conclude that a model which produces more right-handed than left-handed top quarks is suggested by the present Tevatron data.

Original languageEnglish
Article number014033
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number1
Publication statusPublished - 2013 Jul 23

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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