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

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

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

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
Volume88
Issue number1
DOIs
Publication statusPublished - 2013 Jul 23

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asymmetry
quarks
protons
leptons
alternating current
physics
antiprotons
extrapolation
collisions
decay
polarization

ASJC Scopus subject areas

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

Cite this

Interpretations and implications of the top quark rapidity asymmetries AFBt and AFBℓ. / Berger, Edmond L.; Cao, Qing Hong; Chen, Chuan-Ren; Zhang, Hao.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 88, No. 1, 014033, 23.07.2013.

Research output: Contribution to journalArticle

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AB - 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.

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