Bhabha process at LEP — theoretical calculations*
نویسندگان
چکیده
منابع مشابه
Bhabha Process at LEP - Theoretical Calculations
In this contribution we give a short overview of the situation in the precision calculation of the Bhabha process and we present a preliminary numerical result on the second-order sub-leading correction to the small angle Bhabha process. Presented by S. Jadach at Zeuthen Workshop, April 1996, Rheinsberg, Germany § Work supported in part by the US DoE contract DE-FG05-91ER40627, Polish Governmen...
متن کاملPrecision Calculation of Bhabha Scattering at Lep
For the small-angle Bhabha-scattering process, we consider the error budget for the calculation of the LEP/SLC luminosity in the Monte Carlo event generator BHLUMI 4.04, from the standpoint of new calculations of exact results for the respective O(α 2) photonic corrections in the context of the Yennie-Frautchi-Suura exponentiation. We find that an overall precision tag for the currently availab...
متن کاملOn Large-Angle Bhabha Scattering at LEP
The theoretical accuracy of the program TOPAZ0 in the large-angle Bhabha channel is estimated. The physical error associated with the full Bhabha cross section and its forward and backward components separately is given for some event selections and several energy points of interest for LEP1 physics, both for the s and non-s contributions to the cross section. E-mail: [email protected] nicros...
متن کاملLight-Pair Corrections to Small-Angle Bhabha Scattering in a Realistic Set-up at LEP
Light-pair corrections to small-angle Bhabha scattering have been computed in a realistic set-up for luminosity measurements at LEP. The effect of acollinearity and acoplanarity rejection criteria has been carefully analysed for typical calorimetric event selections. The magnitude of the correction, depending on the details of the considered set-up, is comparable with the present experimental e...
متن کاملRunning of the Qed Coupling in Small-angle Bhabha Scattering at Lep
Using the OPAL detector at LEP, the running of the effective QED coupling α(t) is measured for space-like momentum transfer, 2 ≤ −t ≤ 6 GeV, from the angular distribution of smallangle Bhabha scattering. This is currently the most significant direct observation of the running of the QED coupling in a single experiment and the first clear evidence of the hadronic contribution to the running in t...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 1996
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(96)00456-2