A determination of sin2? w and the lepton and quark electroweak couplings frome + e ? data

Renormalization scheme dependence in e+e− annihilation and τ-lepton decay at the next-to-next-to-leading order of perturbative QCD

“…Note that the values of A~ extracted from the data of ref. [25 ] are closer to the world average than those based on ref. [ 24 ].…”

“…We point out that the recent NLO analyses [24][25][26] of (2) in the energy range spanned by the PETRA, PEP and TRISTAN experiments give higher values of A~g which cannot, even taking into account the large associated error, be made compatible with the cited world average. Even for so large values of A~-g we have, however, still pc ( 11,23 ).…”

“…The Table 1 The values of the coefficients rk, k=0, 1, 2, 3, parametrising r(p) in the interval pE (14,21) Table 2 A (s) The values ofp and the extracted ~-g in various RS at both NLO and NNLO and using data from refs. [ 24,25 ].…”

Test of QED by High Energy Electron–Positron Collisions

“…This observation is verified by the TRISTAN measurements [84], showing a 50% increase in Ri, a d at A/S = 60 GeV. The CELLO collaboration [81] and Marshall [82] have performed an analysis using all available cross section data and taking the individual systematic errors and known correlations properly into account. Much care has been given to apply the same higher order radiative corrections to all data.…”

The Top Quark

“…The results come from low-energy processes involving off-mass-shell Z 0 → bb decays and the study of decays of the Z 0 resonance. The experimental evidence is the forward-backward asymmetry in e + e − → bb (7), the absence of flavorchanging neutral currents in b-quark decays (8,9), the absence of large tree level B 0 dB 0 d mixing (10,11), and the Z 0 partial decay width into bb pairs, b . Of these, the latter is the most powerful measurement, both in terms of precision and because the interpretation of the results is not subject to ambiguities from other gauge bosons (Z ), which are predicted in some extensions of the standard model.…”