A study of top-quark Yukawa coupling measurement in e+e - → tt̄ H at √s = 500 GeV

Ryo Yonamine; Katsumasa Ikematsu; Satoru Uozumi; Keisuke Fujii

A study of top-quark Yukawa coupling measurement in e⁺e ^- → tt̄ H at √s = 500 GeV

Ryo Yonamine, Katsumasa Ikematsu, Satoru Uozumi, Keisuke Fujii

Research output: Contribution to conference › Paper › peer-review

Abstract

We report on the feasibility of measuring the top Yukawa coupling in the process: e⁺e^- → tt̄ H. This measurement is crucial to test the mass generation mechanism for matter particles. Since the cross section for this process attains its maximum around √s = 700 GeV, most of the past studies were done assuming this energy region. It has been pointed out, however, that the QCD threshold correction enhances the cross section significantly and might enable its measurement at √s = 500 GeV, which will be accessible already in the first phase of the ILC project. We have implemented this threshold enhancement into our tt̄ H event generator and carried out Monte Carlo simulations. Our results show that tt̄ H events can be observed with a significance of 4.1σ with no beam polarization and 5.4 σ with the e^- and e⁺ beam polarization combination: (-0.8, +0.3).

Original language	English
Pages	40-49
Number of pages	10
Publication status	Published - Dec 1 2009
Externally published	Yes
Event	8th General Meeting of the ILC Physics Working Group - Tsukuba, Japan Duration: Jan 21 2009 → Jan 21 2009

Other

Other	8th General Meeting of the ILC Physics Working Group
Country	Japan
City	Tsukuba
Period	1/21/09 → 1/21/09

ASJC Scopus subject areas

Instrumentation

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title = "A study of top-quark Yukawa coupling measurement in e+e - → t{\=t} H at √s = 500 GeV",

abstract = "We report on the feasibility of measuring the top Yukawa coupling in the process: e+e- → t{\=t} H. This measurement is crucial to test the mass generation mechanism for matter particles. Since the cross section for this process attains its maximum around √s = 700 GeV, most of the past studies were done assuming this energy region. It has been pointed out, however, that the QCD threshold correction enhances the cross section significantly and might enable its measurement at √s = 500 GeV, which will be accessible already in the first phase of the ILC project. We have implemented this threshold enhancement into our t{\=t} H event generator and carried out Monte Carlo simulations. Our results show that t{\=t} H events can be observed with a significance of 4.1σ with no beam polarization and 5.4 σ with the e- and e+ beam polarization combination: (-0.8, +0.3).",

author = "Ryo Yonamine and Katsumasa Ikematsu and Satoru Uozumi and Keisuke Fujii",

year = "2009",

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day = "1",

language = "English",

pages = "40--49",

note = "8th General Meeting of the ILC Physics Working Group ; Conference date: 21-01-2009 Through 21-01-2009",

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T1 - A study of top-quark Yukawa coupling measurement in e+e - → tt̄ H at √s = 500 GeV

AU - Yonamine, Ryo

AU - Ikematsu, Katsumasa

AU - Uozumi, Satoru

AU - Fujii, Keisuke

PY - 2009/12/1

Y1 - 2009/12/1

N2 - We report on the feasibility of measuring the top Yukawa coupling in the process: e+e- → tt̄ H. This measurement is crucial to test the mass generation mechanism for matter particles. Since the cross section for this process attains its maximum around √s = 700 GeV, most of the past studies were done assuming this energy region. It has been pointed out, however, that the QCD threshold correction enhances the cross section significantly and might enable its measurement at √s = 500 GeV, which will be accessible already in the first phase of the ILC project. We have implemented this threshold enhancement into our tt̄ H event generator and carried out Monte Carlo simulations. Our results show that tt̄ H events can be observed with a significance of 4.1σ with no beam polarization and 5.4 σ with the e- and e+ beam polarization combination: (-0.8, +0.3).

AB - We report on the feasibility of measuring the top Yukawa coupling in the process: e+e- → tt̄ H. This measurement is crucial to test the mass generation mechanism for matter particles. Since the cross section for this process attains its maximum around √s = 700 GeV, most of the past studies were done assuming this energy region. It has been pointed out, however, that the QCD threshold correction enhances the cross section significantly and might enable its measurement at √s = 500 GeV, which will be accessible already in the first phase of the ILC project. We have implemented this threshold enhancement into our tt̄ H event generator and carried out Monte Carlo simulations. Our results show that tt̄ H events can be observed with a significance of 4.1σ with no beam polarization and 5.4 σ with the e- and e+ beam polarization combination: (-0.8, +0.3).

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