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QCD Corrections and Clues to New Physics in Precision Experiments

Research Project

Project/Area Number 09640364
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionHiroshima University

Principal Investigator

KODAIRA Jiro  Hiroshima University, Department of Physics, Associate Professor, 理学部, 助教授 (40127080)

Co-Investigator(Kenkyū-buntansha) ONOGI Tetsuya  Hiroshima University, Department of Physics, Research Associate, 理学部, 助手 (70211802)
Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1999: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥700,000 (Direct Cost: ¥700,000)
KeywordsQCD / Radiative Corrections / Perturbation / Lattice QCD / Precision Experiment
Research Abstract

The aim of this project, is to investigate the QCD effects in various processes. To find a clue to New Physics beyond the Standard Model (SM), the reduction of the theoretical ambiguities coming from QPD is essential.
1. For both high and low energy processes, the power corrections are very important, to make a precise prediction of SM. We investigated the higher twist, operator which is one of the sources of power corrections. We have shown how to calculate the anomalous dimensions in a manifestly covariant, approach and demonstrated the explicit, evaluation for the case of twist-3 operators.
2. The behavior of structure functions at small Broken x receives a lot of interests recently. We have studied the gィイD21ィエD2 polarized structure function at small x. Our numerical results showed that the leading logarithmic approximation would be quite unstable against, higher order corrections.
3. The heavy particles like the top-quark are expected to have important information on the symmetry breakdown in SM. We have investigated the QCD corrections to the spin correlation in the top-quark productions in arbitrary spin bases. What, we have found is that, the QCD correction is very small against the intuitive expectations. This result is very important, when one tries to find some clue to New Physics by measuring the spin correlations. We have also investigated the effects of anomalous couplings in the presence of QCD corrections. Now the paper is in preparation.
4. The heavy quark effective theory and/or the non-relativistic QCD is a powerful formulation from both analytical and numerical viewpoints. We have studied the B meson on the lattice using this formalism. We have succeeded to improve the theoretical predictions and these results are important to investigate the problems like the CP violation.

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (40 results)

All Other

All Publications (40 results)

  • [Publications] J.Kodaira: "Polarized Structure Functions in QCD"Progress of Theoretical Physics. 101. 191-22 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] J.Hashida: "More on Large Q^2Events with Polarized Beams"Progress of Theoretical Physics. 101. 775-780 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] J.Kodaira: "QCD Corrections to Spin Correlations in Top Quark Production at Lepton Collider"Physical Review. D59. 014023-1-014023-16 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M.Hori: "Optimal Spin Basis in Polarized Photon Linear Colliders"Physical Review. D58. 014005-1-014005-8 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] J.Kodaira: "Renormalization of Gauge-Invariant Operators for the Structure Function g_2(x, Q^2)"Progress of Theoritical Physics. 99. 315-320 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y.Kiyo: "Does Leading ln x Resummation Predict the Rise of g_2 at Small x?"zeitschrift fur Physik. C74. 631-639 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H.Kawamura: "Renormlization of Twist-4 Operators in QCD Bjorken and Ellis-Jaffe Sum Rules"Modern Physics Letters. A12. 135-143 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S.HASHIMOTO: "A lattice NRQCD calculation of the B^0-B^0 mixing parameter B_B"Physical Review. D60. 094503-1-094503-10 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K.I.ISHIKAWA: "0(a α_s) matching coefficients for the △B=2 operators in the lattice static theory"Physical Review. D60. 034501-1-034501-8 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S.AOKI: "Nonperturbative Determination of Quark Masses in Quenched Lattice QCD with the Kogut-Susskind Fermion Action"Physical Review Letters. 82. 4392-4395 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S.Hashimoto: "Lattice study of B→π semileptonic decay using nonrelativistic lattice QCD"Physical Review. D58. 014502-1-014502-17 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K-I.Ishikawa: "f_B with lattice NRQCD including O(1/m_Q^2 corrections"Physical Review. D56. 7028-7038 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M.Bando: "Predictions of m_b/m_r and m_t in an asymptotically nonfree theory"Physical Review. D56. 1589-1597 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] B.J.Gough: "The Light Quark Masses from Lattice Gauge Theory"Physical Review Letters. 79. 1622-1625 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] J. KODAIRA: "Polarized Structure Functions in QCD"Progress of Theoretical Physics. 101. 191-242 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] J. HASHIDA: "More on Large QィイD12ィエD1 Events with Polarized Beams"Progress of Theoretical Physics. 101. 775-780 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] J KODAIRA: "QCD Corrections to Spin Correlations in Top Quark Production at, Lepton Colliders"Physical Review. D59. 014023-1-014023-16 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. HORI: "Optimal Spin Basis in Polarized Photon Linear Colliders"Physical Review. D58. 014005-1-014005-8 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] J. KODAIRA: "Renormalization of Gauge-Invariant Operators for the Structure Function gィイD22ィエD2(x, QィイD12ィエD1)"Progress of Theoretical Physics. 99. 315-320 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. KIYO: "Does Leading In x Resummation Predict, the Rise of gィイD21ィエD2 at Small x?"Zeitschrift fur Physic. C74. 631-639 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H. KAWAMURA: "Renormalization of Twist-4 Operators in QCD Bjorken and Ellis-Jaffe Sum Rules."Modern Physics Letters. A12. 135-135 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S. HASHIMOTO: "A lattice NRQCD calculation of the BィイD10ィエD1-BィイD10ィエD1 mixing parameter BィイD2BィエD2"Physical Review. D60. 094503-1-094503-10 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. I. ISHIKAWA: "O(aαィイD2sィエD2) matching coefficients for the ΔB = 2 operators in the lattice static theory"Physical Review. D60. 034501-1-034501-8 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S. AOKI: "Nonperturbative Determination of Quark Masses in Quenched Lattice QCD with the Kogut-Susskind Fermion Action."Physical Review Letters. 82. 4392-4395 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S. HASHIMOTO: "Lattice study of' B→π7 semileptonic decay using nonrelativistic lattice QCD"Physical Review. D58. 014502-1-014502-17 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K-I. ISHIKAWA: "fィイD2BィエD2 with lattice NRQCD including O(1/mィイD2QィエD2ィイD12ィエD1) corrections"Physical Review. D56. 7028-7038 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. BANDO: "Predictions of mィイD2bィエD2/mィイD2τィエD2 and mィイD2tィエD2in an asymptotically nonfree theory"Physical Review. D56. 1589-1597 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] B. J. GOUGH: "The Light, Quark Masses from Lattice Gauge Theory."Physical Review Letters. 79. 1622-1625 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] J.Kodaira: "Polarized Structure Functions in QCD."Progress of Theoretical Physics. 101. 191-242 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] S.HASHIMOTO: "A lattice NRQCD calculation of the B^0-B^^-^0 mixing parameter B_B."Physical Review. D60. 094503-1-094503-10 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] K.I.ISHIKAWA: "O(aα_3) matching cofficients for the ΔB = 2 operators in the lattice static theory."Physical Review. D60. 034501-1-034501-8 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] S.AOKI: "Nonperturbative Determination of Quark Masses in Quenched Lattice QCD with the Kogut-Susskind Fermion Action."Physical Review Letters. 82. 4392-4395 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] J.Kodaira: "QCD Corrections to Spin Correlations in Top Quark Production at Lepton Colliders" Physical Review. D59. 1-16 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] J.Kodaira: "Polarized Structure Functions in QCD" Progress of Theoretical Physics. 101. 191-242 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Hashimoto: "Lattice Study of B ->π Semileptonic Decay using Nonrelativistic Lattice" Physical Review. D58. 1-17 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Kiyo: "Does Leading In x Resummation Predict the Rise of g_1 at Small x ?" Zeitschrift fur Physik C. C74. 631-639 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] J.Kodaira: "Renormalization of Gauge-Invariant Operators for the Structure Function g_2(x,O^2)" Progress of Theoretical Physics. 99-2(掲載予定). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] K-I.Ishikawa: "F(B) with Lattice NRQCD Including 0(1/M^2(Q))" Rhysical Review. D56. 7028-7038 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] M.Bando: "Predictions of M(B)/M(TAU)and M(T)in an Asymptotically Nonfree Theory" Rhysical Review. D56. 1589-1597 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] B.J.Gough: "The Light Quark Masses from Lattice Gauge Theory" Rhysical Review Letters. 79. 1622-1625 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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