High Precision Test of QCD at Beijing Electron Positron Collider

  • The generalized Crewther relation relates the cross section ratio R=σ(e+e→hadrons)/σ(e+e→μ+μ) in e+e annihilation with the Bjorken sum rule or the Gross-Llewellyn Smith sum rule in deep inelastic scattering and provides a fundamental connection for observables in Quantum Chromodynamics (QCD) without scale or scheme ambiguities. The ratio R can be measmed at the upgrated Beijing Electal Positron Collider or the τ-Charm factory with higher precision and thus can be served for a high Precision test of QCD in the standard model.
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  • [1] CDF Collab, Abe F et al. Phys. Rev. Lett., 1996, 77:4382 CTEQ Collab, Lai H L et al. Phys. Rev., 1995, D51:4763 3 See, e.g., Cao Z, He Y D. Mod. Phys. Lett, 1995, A10:2674 Klasen M, Kramer G. Phys. Lett., 1996, B386:3845 Brodsky S. J, Lepage G P, Mackenzie P B. Phys. Rev., 1983, D28:228 6 Brodsky S. J, Lu H J. Phys. Rev., 1995, D51:3652 7 Brodsky S J, Lu H J. SLAC–PUB–7098, Invited talk present at the Int Symp. on Heavy Flavory and Electroweak Theory, Beijing, China, August 16–19, 1995 8 Brodsky S J, Gabadadze G T, Kataev A L et al. Phys. Lett., 1996, B372:133 9 Crewther R J. Phys. Rev. Lett., 1972, 28:1421 10 Bjorken J D. Phys. Rev., 1971, D1:1376; Phys. Rev., 1966, 148:1467 11 Gross D, Llewellyn Sixth C. Nucl. Phys., 1969, B14:33712 Mattingly A C, Stevenson P M. Phys. Rev., 1994, D49:43713 CCFR Collab, temp W C et al. Phys. Lett., 1993, B317:65514 Kathev A L, Sidorov A V. Phys. Lett., 1994, B331:17915 CCFR Collab, Qunintas P Z et al. Phys. Rev. Lett, 1993, 71: 1307 16 Ma B Q, Schafer A. Phys. Lett, 1996, B378:307; Yang J J, Ma B Q, Li G L. Commun. Theor. Phys.,1997, 28:221;Phys. Lett., 1998, B423: 162
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Ma Boqiang. High Precision Test of QCD at Beijing Electron Positron Collider[J]. Chinese Physics C, 1999, 23(9): 922-925.
Ma Boqiang. High Precision Test of QCD at Beijing Electron Positron Collider[J]. Chinese Physics C, 1999, 23(9): 922-925. shu
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Received: 1999-02-05
Revised: 1900-01-01
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High Precision Test of QCD at Beijing Electron Positron Collider

    Corresponding author: Ma Boqiang,
  • Institute of High Energy Physics, The Chinese Academy of Sciences, Beijing 100039

Abstract: The generalized Crewther relation relates the cross section ratio R=σ(e+e→hadrons)/σ(e+e→μ+μ) in e+e annihilation with the Bjorken sum rule or the Gross-Llewellyn Smith sum rule in deep inelastic scattering and provides a fundamental connection for observables in Quantum Chromodynamics (QCD) without scale or scheme ambiguities. The ratio R can be measmed at the upgrated Beijing Electal Positron Collider or the τ-Charm factory with higher precision and thus can be served for a high Precision test of QCD in the standard model.

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