Initial-Final-State Interference in the Z line-shape
S. Jadach, B. Pietrzyk, E. Tournefier, B.F.L. Ward, Z. Was
TL;DR
This paper analyzes how initial-final state interference affects the precision of Z boson line-shape measurements, quantifying uncertainties and discussing higher-order corrections to improve accuracy.
Contribution
It provides a detailed assessment of the uncertainties from initial-final state interference in Z line-shape parameters and discusses corrections beyond first order.
Findings
Uncertainty of 2×10^(-4) in total cross section sigma_zero(had)
Uncertainty of 0.15 MeV in Z mass M_Z
Uncertainty of 0.1 MeV in Z width Gamma_Z
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 sigma zero(had) at the Z peak, 0.15 MeV for the Z mass M Z, and 0.1 MeV for the Z width Gamma Z. Corrections to Initial--Final-State Interference beyond \Order{\alpha^1} are discussed.
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