Spin configuration of top quark pair production with large extra dimensions at photon-photon colliders

Kang Young Lee, Seong Chan Park, H. S. Song, Jeong Hyeon Song, Chaehyun Yu

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Top quark pair production at photon-photon colliders is studied in a low scale quantum gravity scenario. From the dependence of the cross sections on the spin configuration of the top quark and antiquark, we introduce a new observable, top spin asymmetry. It is shown that there exists a special top spin basis where with the polarized parent electron beams the top spin asymmetry vanishes in the standard model but retains substantial values with the large extra dimension effects. We also present lower bounds of the quantum gravity scale (Formula presented) from total cross sections with various combinations of the laser, electron beam, and top quark pair polarizations. The measurements of the top spin state (Formula presented) with unpolarized initial beams are shown to be most effective, enhancing by about 5% the (Formula presented) bounds with respect to the totally unpolarized case.

Original languageEnglish
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume61
Issue number7
DOIs
Publication statusPublished - 2000 Jan 1

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pair production
quarks
photons
configurations
asymmetry
electron beams
gravitation
cross sections
polarization
lasers

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "Top quark pair production at photon-photon colliders is studied in a low scale quantum gravity scenario. From the dependence of the cross sections on the spin configuration of the top quark and antiquark, we introduce a new observable, top spin asymmetry. It is shown that there exists a special top spin basis where with the polarized parent electron beams the top spin asymmetry vanishes in the standard model but retains substantial values with the large extra dimension effects. We also present lower bounds of the quantum gravity scale (Formula presented) from total cross sections with various combinations of the laser, electron beam, and top quark pair polarizations. The measurements of the top spin state (Formula presented) with unpolarized initial beams are shown to be most effective, enhancing by about 5{\%} the (Formula presented) bounds with respect to the totally unpolarized case.",
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Spin configuration of top quark pair production with large extra dimensions at photon-photon colliders. / Lee, Kang Young; Park, Seong Chan; Song, H. S.; Song, Jeong Hyeon; Yu, Chaehyun.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 61, No. 7, 01.01.2000.

Research output: Contribution to journalArticle

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AU - Park, Seong Chan

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AU - Yu, Chaehyun

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AB - Top quark pair production at photon-photon colliders is studied in a low scale quantum gravity scenario. From the dependence of the cross sections on the spin configuration of the top quark and antiquark, we introduce a new observable, top spin asymmetry. It is shown that there exists a special top spin basis where with the polarized parent electron beams the top spin asymmetry vanishes in the standard model but retains substantial values with the large extra dimension effects. We also present lower bounds of the quantum gravity scale (Formula presented) from total cross sections with various combinations of the laser, electron beam, and top quark pair polarizations. The measurements of the top spin state (Formula presented) with unpolarized initial beams are shown to be most effective, enhancing by about 5% the (Formula presented) bounds with respect to the totally unpolarized case.

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