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2005 Fiscal Year Final Research Report Summary

Study of CP violation on top-quark

Research Project

Project/Area Number 15540278
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionOkayama University

Principal Investigator

TANAKA Reizaburo  Okayama University, Graduate School of Natural Science and Technology, Associate professor (90325077)

Co-Investigator(Kenkyū-buntansha) SUMINO Yukinari  Tohoku University, Graduate School of Science, Assistant professor (80260412)
NAKANO Itsuo  Okayama University, Graduate School of Natural Science and Technology, professor (90133024)
Project Period (FY) 2003 – 2005
KeywordsCP violation / anomalous coupling / baryogenesis / top-quark / helicity / hadron collider / Tevatron / LHC
Research Abstract

The aim of this research is the study of CP violation and anomalous coupling on top-quark decay at CDF experiment. That will lead to the beyond the Standard Model and some knowledge about the baryogenesis of universe. The study on the mechanism of the top-quark production and decay is especially important since the CDF Run-II is expected to produce a lot of top-quark pair creation.
We have developed a method applicable to top-quark semi-leptonic decay although the reconstruction of top-quark spin at hadron collider is not simple. That is called a sine-helicity method, which reconstructs the effective-spin of the top-quark. This method projects lepton direction to the top-quark helicity at top-quark rest system. We have confirmed that the angular distribution of top-quark decay is reproduced that from the polarized top-quark.
We have suggested to apply this new top-quark effective-spin for the study of anomalous coupling at top-quark decay vertex. This method is more sensitive to the anomalous coupling than the familiar beam line base and off-diagonal base definition of top-quark spin axis. We have also studied a method using angular correlation between W-boson and a charged particle. We used a likely-method to analyze lepton+four jets events.
We have also studied the sensitivity of Tevatron and LHC experiments. And we have gotten the conclusion that this mehod will be promising.

  • Research Products

    (4 results)

All 2006

All Journal Article (4 results)

  • [Journal Article] New method for reconstructing effective top quark spin2006

    • Author(s)
      隅野行成, 津野総司
    • Journal Title

      Physics Letters B633

      Pages: Soji

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Search for anomalous couplings in top decay at hadron collider2006

    • Author(s)
      津野総司, 中野逸夫, 隅野行成, 田中礼三郎
    • Journal Title

      Physical Review D73

      Pages: 054011

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] New method for reconstructing effective top quark spin2006

    • Author(s)
      Yukinari Sumino, Soji Tsuno
    • Journal Title

      Physics Letters B633

      Pages: 715-720

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Search for anomalous couplings in top decay at hadron collider2006

    • Author(s)
      Soji Tsuno, Itsuo Nakano, Yukinari Sumino, Reizaburo Tanaka
    • Journal Title

      Physical Review D73

      Pages: 054011

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 2011-06-18  

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