Initial–final-state interference in the Z line-shape

Abstract The uncertainty in the determination of the Z line-shape parameters coming from the precision of the calculation of the initial-state radiation and initial–final-state interference is 2×10−4 for the total cross section σ0had at the Z peak, 0.15 MeV for the Z mass MZ, and 0.1 MeV for the Z width ΓZ. Corrections to initial–final-state interference beyond O (α 1 ) are discussed.

[1]  Padova,et al.  Two loop heavy top effects on the m(Z) - m(W) interdependence , 1996, hep-ph/9603374.

[2]  M. Greco.  Radiative corrections to e+e- ? +- around the Z0 , 1980 .

[3]  F. Teubert,et al.  About the relevance of the imaginary components of the effective couplings in the asymmetry measurements , 1995 .

[4]  R. W. Brown,et al.  Weak Corrections to the $e^+ e^- \to \mu^+ \mu^-$ Asymmetry , 1984 .

[5]  B. Pietrzyk,et al.  Influence of the c.m.s. energy-dependent theoretical errors on the measurement of the Z0 parameters at LEP , 1994 .

[6]  Durham,et al.  New results on the theoretical precision of the LEP/SLC luminosity 1 Work supported in part by the U , 1998, hep-ph/9811245.

[7]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[8]  Was,et al.  First- and higher-order noninterference QED radiative corrections to the charge asymmetry at the Z resonance. , 1990, Physical review. D, Particles and fields.

[9]  I. Akushevich,et al.  Single-Spin Asymmetries for Small-Angle Pion Production in High-Energy Hadron Collisions (submitted to Eur. Phys. J C) , 1999 .

[10]  The Aleph Collaboration,et al.  A Combination of Preliminary Electroweak Measurements and Constraints on the Standard Model , 2001, hep-ex/0612034.

[11]  Stanislaw Jadach,et al.  YFS2— The second-order Monte Carlo program for fermion pair production at LEP/SLC, with the initial state radiation of two hard and multiple soft photons , 1990 .

[12]  S. Jadach,et al.  The present theoretical error on the Bhabha scattering cross section in the luminometry region at LEP , 1996, hep-ph/9605239.

[13]  M. Greco,et al.  Radiative Corrections to e+ e- ---> mu+ mu- Around the Z0 , 1980 .

[14]  Z. Was,et al.  QCD and QED corrections to the longitudinal polarization asymmetry , 1988 .

[15]  Z. Was,et al.  Complete standard model predictions for the muon forward-backward asymmetry at LEP , 1991 .

[16]  B. Pietrzyk,et al.  On the precision of calculations of initial state radiation in the LEP Z line-shape fits , 1999 .

[17]  Miss A.O. Penney.  (b) , 1974, The New Yale Book of Quotations.