ar X iv : h ep - p h / 96 11 46 3 v 1 2 8 N ov 1 99 6 FNT / T - 96 / 28 The QED Radiator at order α 3
نویسنده
چکیده
The O(α3) leading logarithmic contribution to the QED radiator is analytically computed. The effect of the correction on two-fermion physics at LEP1 and LEP2 is evaluated and critically compared with the one of already known next-to-leading O(α2) corrections. The O(α3) leading logarithmic corrections turn out to be relevant in view of the experimental precision already reached at LEP1 and foreseen at LEP2. E-mail: [email protected] [email protected], [email protected] [email protected] FNT/T-96/28 November 28, 1996 QED corrections are, as well known, an essential ingredient of precision physics at LEP/SLC. In particular, initial-state photonic radiation (ISR) plays a central rôle in the determination of the energy effectively available in the center of mass of the ee reaction. Nowadays, this effect is popularly described by the so called Structure Functions (SF) method, pioneered in [1] and subsequently developed in [2, 3, 4]. In the case in which only a cut on the invariant mass of the event after ISR is considered, the SF method provides a very simple recipe for computing the corrected cross section as a one-dimensional integration of the proper kernel cross section times the so called “radiator” (or “flux function”), namely as
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متن کاملar X iv : h ep - p h / 96 11 46 3 v 2 3 J un 1 99 7 FNT / T - 96 / 28 On the QED Radiator at order α 3
The O(α3) leading logarithmic contribution to the QED radiator in the additive form is considered. The effect of the correction on twofermion physics at LEP1 and LEP2 is evaluated and critically compared with the one of next-to-leading O(α2) corrections. A critical comparison with existing estimates for the LEP1 energy range is also performed. The O(α3) leading logarithmic corrections turn out ...
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