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1998 Fiscal Year Final Research Report Summary

Parton Showers in Hight Energy Processes

Research Project

Project/Area Number 08640363
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 InstitutionYamanashi University

Principal Investigator

MUNEHISA Tomoo  Yamanashi University, Fac.of Engr.Assistant Prof., 工学部, 助教授 (30174254)

Project Period (FY) 1996 – 1998
KeywordsHight energy process / parton showers / QED / QCD / NLL approximation / renormalization group equation
Research Abstract

Event generators, which are indispensable tools to high energy experiments, need showers for producing photons or cartons, based on the renormalization group equation in QED and QCD.The primary purpose of our research is to apply the NLL shower that is improved on accuracy of models to many processes. The target of this research project is (1) making a model in the two photon process, (2) making a NLL model in the e^+e^- annihilation and (3) making a NLL model in the proton.-proton scattering.
The first purpose in the two photon process of the e^+e^- scattering has been accomplished completely, then the paper and the manual has been published. The second one has been achieved almost, which is to make the NLL shower and the event generator including it in the radiative process in the e^+e^- annihilation. Features in the research are precise discussions on delails of the algorithm, because the NLL order is of order of the coupling constant squared of QED, i.e. 10^<-5>. These discussions led to clarifying the accuracy of the shower algorithm in the LL order, which was summarized in a published paper. Furthermore the precise discussions teached us that two fundamental effects were quite important. They are a dynamical change of the coupling and the consistent treatment of the infrared singularity in the NLL order. This progress has enabled us to make the NLL shower and careful tests of the model are going now. A paper has been already written and is included in the research report.
The third purpose has not been completed yet, but extensive study was made for this. Especially it is found that one should use the energy conservation for normalizations of events in treatments of gluons showers, which was discussed in published paper.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] T.Munehisa: "A Parton Shower Model for Hadronic Two-Photon Process in e^+e^- Scattering" Z.Phys.C70. 655-660 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Munehisa: "Improved QEDPS for Radiation Correction in e^+e^- Annihilation" Prog.Theor.Phys.95. 375-388 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Kurihara: "Hard Photon Distribution in e^+e^- Annihilation Process by QED" Prog.Theor.Phys.96. 1223-1235 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kato: "GGPS: a Two-Photon Event Generation Based on the Parton Shower Model" Compt.Phys.Comm.106. 139-156 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.Fujimoto: "grc45 : a Four-termion Event Generator for e^+e^- Collision." Compt.Phys.Commun.100. 128 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.Fujimoto: "susy23: An Event Generator for Supersymmetric Processes" Compt.Phys.Commun.111. 185-216 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Tanaka: "Comparison of Algorithms for Singlet Parton Generations in Deep Inelastic Scattering" Mod.Phys.Lett.A. 13. 1085-1094 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] D.Bardinet: "Event Generators for WW Physics" CERN. 96-01A. (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Munehisa, P.Aurenche, J.-Ph.Guillet, M.Fontannaz, Y.Shimizu: "A Parton Shower Model for Hadronic Tow-Photon Process in e^+e^- Scattering" Z.Phys.C70. 655-660 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Munehisa, J.Fujimoto, Y.Kurihara, Y.Shimizu: "Improved QEDPS for Radiative Corrections in e^+e^- Annihilation" Prog.Theor.Phys.95. 375-388 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Kurihara, J.Fujimoto, Y.Shimizu, T.Munehisa: "Herd Photon Distribution in e^+e^- Annihilation Process by QEDPS" Prog.Theor.Phys.96. 1223-1235 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.Fujimoto, et al.: "grc4f v1.0 : a Four-fermion Event Generator for e^+e^- Collions" Compt.Phys.Comm.100. 128 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Munehisa, K.Kato, D.Perret-Gallix, Y.Shimizu: "GGPS : a Two-Photon Event Generator Based on the Parton Shower Method" Comput.Phys.Commun.106. 139-156 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.Fujimoto, et al.: "susy23 v2.0 : an Event Generator for Supersymmetric Processes at e^+e^- Colliders" Compt.Phys.Commun.111. 185-216 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Tanaka and T.Munehisa: "Comparison of Algorithms for Singlet Parton Generations in Deep Inelastic Scattering" Mod.Phys.Lett.A13. 1085-1094 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] D.Bardinet et al.: "EVENT GENERATORS FOR WW PHYSICS" CERN. 96-01A. (1997)

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

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Published: 1999-12-08  

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