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Study of high-transverse-monontum lepton productoin in ep collisions

Research Project

Project/Area Number 10440080
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionInstitute of Particle and Nuclear Studies(IPNS), High Energy Accelerator Research Organization(KEK)

Principal Investigator

TOKUSHUKU Katsuo  IPNS, KEK< Associate Professor, 素粒子原子核研究所, 助教授 (80207547)

Co-Investigator(Kenkyū-buntansha) KITAMURA Shoichi  Tokyo Metoropolitan Univ. of Health Science Prof., 放射線医学科, 教授 (60106599)
HAMATSU Ryosuke  Tokyo Metropolitan Univ., Dept. of Phys., Ass. Prof., 大学院・理学研究科, 助教授 (20087092)
YAMADA Sakue  IPNS, KEK, Associate Director, 素粒子原子核研究所, 所長 (70011658)
TSURUGAI Tatsumasa  Meiji Gakuin Univ. Ass. Prof., 法学部, 助教授 (50267366)
KON Tadashi  Seikei Univ. Ass. Prof., 工学部, 助教授 (90215442)
Project Period (FY) 1998 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥10,400,000 (Direct Cost: ¥10,400,000)
Fiscal Year 2001: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2000: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1999: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1998: ¥5,100,000 (Direct Cost: ¥5,100,000)
Keywordselectron-proton collision / HERA / Supersymmpetric particles / the standard model / W boson / leptoquark / electron polarization / リニアコライダー / 超対称性模型 / トリガー回路
Research Abstract

We have studied productions of leptons with high transverse-energy in electron-proton scatterings with the e-p collider HERA built at DESY in Germany. Any deviation in the cross sections compared with the predictions of the standard model could imply new phenomena such as the production of supersymmetric particles. Especially, when we started the project, an experiment reported a slight excess of high energy muon production so that further searches with the higher statistics were urgently awaited.
In parallel to experimental searches with the data taken by ZEUS detector at HERA, basic theoretical studies were performed in order to understand sensitivity to new phenomena. It is planned to upgrade the HERA to get higher luminosity and to enable to use longitudinally polarized electron in the collision since 2002. The effect of the polarization in the production of supersymmetric particles are studied and found that the cross section is doubled.
In order to estimate the rare background from the two-photon processes, a new Monte Carlo generator was developed.
Searches for high momentum muons and taus were performed and found that it is consistent to the production from W boson decays. High momentum electron and neutrino productions were also consistent with the standard neutral- and charged- current interactions. From these results we set limit in the mass/coupling of supersymmetric particles, leptoquarks and excited fermions.

Report

(5 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (42 results)

All Other

All Publications (42 results)

  • [Publications] ZEUS Collaboration, J.Breitweg et al.: "Search for selectron and squark production in e^+p collisions at HERA"Phys. Lett.. B434. 214-230 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] ZEUS Collaboration, J.Breitweg et al.: "Measurement of high-Q2 neutral-current e+p deep inelastic scattering cross sections at HERA"Euro. Phys. J.. C11. 427-445 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] ZEUS Collaboration, J.Breitweg et al.: "Measurement of high-Q2 charged-current e+p deep inelastic scattering cross sections at HERA"Euro. Phys. J.. C11. 411-428 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] ZEUS Collaboration, J.Breitweg et al.: "W production and the search for events with an isolated high-energy lepton and missing transverse momentum at HERA"Phys. Lett.. B471. 411-428 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] ZEUS Collaboration, J.Breitweg et al.: "Search for Contact Interactions in Deep Inelastic e+p --> e+X Scattering at HERA"Euro. Phys. J.. C14. 239-254 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] ZEUS Collaboration, J.Breitweg et al.: "Measurement of inclusive prompt photon photoproduction at HERA"Phys. Lett.. B472. 175-188 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] ZEUS Collaboration, J.Breitweg et al.: "Search for Resonance Decaying to e^+-jet in e^+p Interactions at HERA"Euro. Phys. J.. C16. 253-267 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] ZEUS Collaboration, J.Breitweg et al.: "Search for resonance decays to an anti-neutrino plus jet in e^+p scattering at DESY HERA"Physical Review. D63. 052002 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A.Bartl et al.: "Impact of Bosonic Decays on the search for tau(2) and neutrino(tau)"Phys. Lett.. B460. 157-163 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] G.Belanger, F.Boudjema, T.Kon, V.Lafage: "Associated Stop Higgs Production at the Linear Collider and Extract the Stop Parameters"Euro. Phys. J.. C9. 511-520 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] G.Belanger, F.Boudjema, T.Kon, V.Lafage: "Z Radiation of Stops at a Linear Collider"Euro. Phys. J.. C12. 323-330 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Kon, T.Kobayashi, S.Kitamura, T.Iimura: "Single sbottom/charm production at HERA in an R partiy breaking supersymmetric model"Phys. Lett.. B494. 280-286 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S.Kitamura, T.Kon, T.Kobayashi: "Single scaler top production with polarized beams in ep collisions at HERA"Modern Physics Letters. A16. 947-955 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Abe: "GRAPE-Dilepton(verison 1.1) A generator dileption production in ep collision"Comp. Phys. Comm.. 136. 126-147 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] J.Breitweg et al. (ZEUS Collaboration): "Search for selection and squark production in e+p collisions at HERA"Physics Letters B. 434. 214-230 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] J.Breitweg et al. (ZEUS Collaboration): "Measurement of High Q^2 Neutral Current e+p Deep Inelastic Scattering Cross Sections at HERA"The European Physical Journal. C11. 427-445 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] J.Breitweg et al. (ZEUS Collaboration): "Measurement of High Q^2 Chaged Current e+p Deep Inelastic Scattering Cross Sections at HERA"The European Physical Journal. C12. 411-428 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] J.Breitweg et al. (ZEUS Collaboration): "W Production and the Search for Events with an Isolated High-Energy Lvpion and Missing Transverse Momentum at HERA"Physics Letters B. 471. 411-428 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] J.Breitweg et al. (ZEUS Collaboration): "Search for Contact Interactions in Deep Inelastic e+p ・・> e^+ Scattering at HERA"The European Physical Journal. C14. 239-254 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] J.Breitweg et al. (ZEUS Collaboration): "Measurement of inclusive prompt photon photopreduction at HERA"Physics Letters B. 472. 175-188 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] J.Breitweg et al. (ZEUS Collaboration): "Search for Resonances Decaying to e^+ jet in e+p Interactions at HERA"The European Physical Journal. C16. 253-267 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] J.Breitweg et al. (ZEUS Collaboration): "Search for resonance decays to antineutrino plus jet in e+p scattering at DESY HERA"Physical Review D. 63(Article number 052002). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A.Bartl et. al.: "Impact of Bosonic Decays on the search for tau(2) arid neutrino(tau)"Physics Letters B. 460. 157-163 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] G.Belanger, FBoudjema.T.Kon and V.Lafage: "Associated stop higgs production at the linear collider and extract the stop parameters"The European Physical Journal. C9. 511-520 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] G.Belanger, FBoudjema.T.Kon and V.Lafage: "Z radiation of stops at a linear collider"The European Physical Journal. C12. 323-330 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. Kitamura, T Kon and T. Kobayashi: "Single scalar top production with polarized beams in ep collisions at HERA"Modern Physics Letters A. 16. 947-955 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Kon, T. Kobayashi, S. Kitamura and T. Iimura: "Single sbottom/scharm production at HERA in an R-Parity breaking supersymmetric model"Physics Letters B. 494. 280-286 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Abe: "GRAPE-Dilepton (version 1.1) A generator for dilepton production in ep collisions"Computer Physics Communications. 136. 126-147 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] ZEUS Collaboration, J.Breitweg et al.: "Search for resonance decays to an anti-neutrino plus jet in e^+p scattering at DESY HERA"Physical Review. D63. #052002 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] S.Kitamura, T.Kon, T.Kobayashi: "Single scaler top production with polarized beams in ep collisions at HERA"Modern Physics Letters. A16. 947-955 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Abe: "GRAPE-Dilepton(verison 1.1)A generator for dileption production in ep collision"Comp. Phys. Comm.. 136. 126-147 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] ZEUS Collaboration,J,Breitweg et al.: "Measurement of inclusive prompt photon photoproduction at HERA"Phys.Lett.. B472. 175-188 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] ZEUS Collaboration,J.Breitweg et al.: "Search for Resonance Decaying to e^+-jet in e^+ p Interactions at HERA"Euro.Phys.J.. C16. 253-267 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Kon and T.Kobayashi and S.Kitamura: "Single sbottom/charm prodcution at HERA in an R partiy breaking supersymmetric model"Phys.Lett.. B494. 280-286 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] G.Belanger,F.Boudjema,T.Kon and V.Lafage: "Z Radiation of Stops at a Linear Collider"Euro.Phys.J.. C12. 323-330 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] ZEUS Collaboration, J. Breitweg et al.: "Measurement of high-Q2 charged current e^+ p deep inelastic scattering cross sections at HERA"Euro. Phys. J.. C11. 411-428 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] ZEUS Collaboration, J. Breitweg et al.: "Measurement of high-Q2 neutral-current e^+ p deep inelastic scattering cross section at HERA"Euro. Phys. J.. C11. 427-445 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] ZEUS Collaboration, J. Breitweg et al.: "W production and the search for events with an isolated high-energy lepton and missing transverse momentum at HERA"Phys. Lett.. B471. 411-428 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] A. Bartl et al.: "Impact of Bosonic Decays on the search for tau(2) and neutrino(tau)"Phys. Lett.. B460. 157-163 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] G. Belanger, F. Boudjema, T. Kon and V. Lafage: "Associated Stop Higgs Production at the Linear Collider and Extract the Stop Parameters"Euro. Phys. J.. C9. 511-520 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] ZEUS Collaboration.J.Breitweg et al.: "Search for Selectron and Squark Proiduction in e'p Collisions at HARA" Physice Letters. B434. 214-230 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] A.Bartl et al.: "Bosonic Decays of Stop_2 and Sbottom_2" Physice Letters. B435. 220-234 (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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