Measuring the top Yukawa coupling at the ILC at √s=500GeV

Ryo Yonamine, Katsumasa Ikematsu, Tomohiko Tanabe, Keisuke Fujii, Yuichiro Kiyo, Yukinari Sumino, Hiroshi Yokoya

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

We report on the feasibility of the direct measurement of the top Yukawa coupling gt at the International Linear Collider during its first phase of operation with a center-of-mass energy of 500 GeV. The signal and background models incorporate the nonrelativistic QCD corrections which enhance the production cross section near the tt̄ threshold. The e +e-→tt̄H signal is reconstructed in the 6-jet+lepton and the 8-jet modes. The results from the two channels are combined. The background processes considered are e+e -→tb̄W-/t̄bW+ (which includes e+e-→tt̄), e+e -→tt̄Z, and e+e-→tt̄g *→tt̄bb̄. We use a realistic fast Monte Carlo detector simulation. Signal events are selected using event shape variables, through jet clustering, and by identifying heavy flavor jets. Assuming a Higgs mass of 120 GeV, polarized electron and positron beams with (Pe -,Pe+)=(-0.8,+0.3), and an integrated luminosity of 1ab-1, we estimate that the e+e-→tt̄H events can be seen with a statistical significance of 5.2σ, corresponding to the relative top Yukawa coupling measurement accuracy of |Δg t/gt|=10%.

Original languageEnglish
Article number014033
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume84
Issue number1
DOIs
Publication statusPublished - 2011 Jul 26
Externally publishedYes

ASJC Scopus subject areas

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

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