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Model independent fitting to theZ line shape

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Zeitschrift für Physik C Particles and Fields

Abstract

An improved model independent formula to fit theZ line shape parameters is presented. The accuracy of the QED radiative corrections used in the formula is estimated, as is the absolute accuracy of the formula itself. The precision of the formula is compared with existing fitting formulae, in terms of cross sections produced and in terms of theZ parameters returned from a fit. The errors which the LEP-SLC experiments can expect to achieve on theZ parameters are examined as a function of total integrated luminosity. The formula presented here can fit theZ parameters with high accuracy: below 1 MeV for theZ mass, the order of 1 MeV for total width, and below 0.04% for the hadronic and leptonic peak cross sections. Such biases will remain much below the expected experimental uncertainties from LEP and SLC.

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References

  1. Z. Physics at LEP I, G. Altarelli et al. (eds.), CERN 89-08, 1989

  2. F.A. Berends: In: Z Physics at LEP I, G. Altarelli et al. (eds.), CERN 89-08, 1989

  3. G. Burgers the FORTRAN program ZAPP, exponentiation as in [14]; see also G. Burgers, CERN-TH.5119/88. and F.A. Berends et al.: Phys. Lett. B203 (1988) 177

  4. Mark-II Collab: Phys. Rev. Lett. 63 (1989) 724; 63 (1989) 2173; L3 Collab.: Phys. Lett. B231 (1989) 509; B237 (1990) 136; ALEPH Collab: Phys. Lett. B231 (1989) 519; B235 (1989) 399; OPAL Collab.: Phys. Lett. B231 (1989) 530; B240 (1990) 512; DELPHI Collab.: Phys. Lett. B231 (1989) 539; B241 (1990) 435

    Google Scholar 

  5. M. Böhm, A. Denner, W. Hollik: Nucl. Phys. B304 (1988) 687

    Google Scholar 

  6. M. Consoli, W. Hollik, F. Jegerlehner: In: Z Physics at LEP I, G. Altarelli et al. (eds.), CERN 89-08, 1989

  7. W.J. Marciano, A. Sirlin: Phys. Rev. Lett. 46 (1981) 163

    Google Scholar 

  8. D.C. Kennedy, B.W. Lynn: SLAC-PUB 4039 (1986); Nucl. Phys. B322 (1989) 1

  9. Private communication, authors of the program ZSHAPE are W. Beenakker, F.A. Berends s. van der Marck. See [2]

  10. Private communication, the program EXPOSTAR, D.C. Kennedy, B.W. Lynn, C.J.-C. Im, R.G. Stuart: Nucl. Phys. B321 (1989) 83

    Google Scholar 

  11. R. Kleiss et al.: In: Z Physics at LEP I, G. Altarelli et al. (eds.), CERN 89-08. 1989

  12. H. Burkhardt, F. Jegerlehner, G. Penso, C. Verzegnassi: Z. Phys. C—Particles and Fields 43 (1989) 497; In ‘Polarisation at LEP’, CERN 88-06 (1988) 145

    Google Scholar 

  13. G. D'Agostini, W. de Boer, G. Gringhammer: Phys. Lett. B229 (1989) 160

    Google Scholar 

  14. F.A. Berends, G. Burgers, W.L. Van Neerven: Nucl. Phys. B297 (1988) 429

    Google Scholar 

  15. V.N. Gribov, L.N. Lipatov: Sov. J. Nucl. Phys. 15 (1972) 438, 675

    Google Scholar 

  16. S. Jadach, J.H. Kühn, R.G. Stuart, Z. Was: Z. Phys. C—Particles and Fields 38 (1988) 609

    Google Scholar 

  17. R.N. Cahn: Phys. Rev. D36 (1987) 2666; The formula is given in [2] as (3.55)

    Google Scholar 

  18. A. Borrelli, M. Consoli, L. Maiani, R. Sisto: Nucl. Phys. B333 (1990) 357

    Google Scholar 

  19. A. Hofmann: Private communication

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Authors and Affiliations

  1. CERN, CH-1211, Geneva, Switzerland

    M. Martinez

  2. Laboratori de Física d'Altes Energies, Universitat Autònoma de Barcelona, E-08193, Bellaterra (Barcelona), Spain

    Ll. Garrido & R. Miquel

  3. Department of Physics, University of Wisconsin, 53706, Madison, WI, USA

    J. L. Harton

  4. Laboratoire de Physique Nucléaire et des Hautes Energies, Ecole Polytechnique, IN2P3-CNRS, F-91128, Palaiseau CEDEX, France

    R. Tanaka

Authors
  1. M. Martinez
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  2. Ll. Garrido
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  3. R. Miquel
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  4. J. L. Harton
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  5. R. Tanaka
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Supported by the US Department of Energy, contract DE-AC02-76ER00881

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Martinez, M., Garrido, L., Miquel, R. et al. Model independent fitting to theZ line shape. Z. Phys. C - Particles and Fields 49, 645–655 (1991). https://doi.org/10.1007/BF01483581

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  • DOI: https://doi.org/10.1007/BF01483581

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