Associated production of a single heavy T quark in the littlest and simplest little Higgs models

Kingman Cheung, Choong Sun Kim, Kang Young Lee, Jeonghyeon Song

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The colored SU(2)L-singlet heavy T-quark is one of the most crucial ingredients in little Higgs models, which is introduced to cancel the largest contribution of the standard model (SM) top quark to the Higgs boson mass at one-loop level. In two representative little Higgs models, the littlest Higgs model and the SU(3) simplest Higgs model, we comprehensively study the single heavy T-quark production at Large Hadron Collider (LHC). After presenting the possibility of relatively light (∼500GeV) T-quark in the simplest little Higgs model, we consider all the relevant processes, the 2→2 process of qb→q′T, the 2→3 process of qg→q′Tb̄, the s-channel process of qq̄′→Tb̄, and the gluon-fusion process of gg→Tt̄. We found that the 2→3 process can be quite important, as its cross section is about 30% of the 2→2 one and it is dominant in high pT distributions. The s-channel and the gluon-fusion processes also show distinctive features in spite of their suppressed cross sections. In the gluon-fusion process of the simplest little Higgs model, for example, the pseudoscalar contribution is rather dominant over the Higgs contribution for relatively light MT.

Original languageEnglish
Article number115013
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume74
Issue number11
DOIs
Publication statusPublished - 2006 Dec 27

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quarks
fusion
cross sections
Higgs bosons
ingredients

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "The colored SU(2)L-singlet heavy T-quark is one of the most crucial ingredients in little Higgs models, which is introduced to cancel the largest contribution of the standard model (SM) top quark to the Higgs boson mass at one-loop level. In two representative little Higgs models, the littlest Higgs model and the SU(3) simplest Higgs model, we comprehensively study the single heavy T-quark production at Large Hadron Collider (LHC). After presenting the possibility of relatively light (∼500GeV) T-quark in the simplest little Higgs model, we consider all the relevant processes, the 2→2 process of qb→q′T, the 2→3 process of qg→q′Tb̄, the s-channel process of qq̄′→Tb̄, and the gluon-fusion process of gg→Tt̄. We found that the 2→3 process can be quite important, as its cross section is about 30{\%} of the 2→2 one and it is dominant in high pT distributions. The s-channel and the gluon-fusion processes also show distinctive features in spite of their suppressed cross sections. In the gluon-fusion process of the simplest little Higgs model, for example, the pseudoscalar contribution is rather dominant over the Higgs contribution for relatively light MT.",
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Associated production of a single heavy T quark in the littlest and simplest little Higgs models. / Cheung, Kingman; Kim, Choong Sun; Lee, Kang Young; Song, Jeonghyeon.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 74, No. 11, 115013, 27.12.2006.

Research output: Contribution to journalArticle

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