Light-Pair Corrections to Small-Angle Bhabha Scattering in a Realistic Set-up at LEP
نویسندگان
چکیده
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 error.
منابع مشابه
X iv : h ep - p h / 98 11 43 6 v 1 2 3 N ov 1 99 8 Light Pair Correction to Bhabha Scattering at Small Angle
This work deals with the computation of electron pair correction to small angle Bhabha scattering, in order to contribute to the improvement of luminometry precision at lep/slc below 0.1% theoretical accuracy. The exact qed four-fermion matrix element for e + e − → e + e − e + e − , including all diagrams and mass terms, is computed and different Feynman graph topologies are studied to quantify...
متن کاملLight Pair Correction to Bhabha Scattering at Small Angle
This work deals with the computation of electron pair correction to small angle Bhabha scattering, in order to contribute to the improvement of luminometry precision at lep/slc below 0.1% theoretical accuracy. The exact qed four-fermion matrix element for e+e− → e+e−e+e−, including all diagrams and mass terms, is computed and different Feynman graph topologies are studied to quantify the error ...
متن کاملTOPAZ 0 4 . 0 - A new version of a computer pro - gram for evaluation of de - convoluted and real - istic observables at LEP 1 and LEP 2
The program TOPAZ0 was developed for computing a variety of physical observables which are related to the e+e− annihilation into fermion pairs and to the large angle Bhabha scattering around the Z resonance. Among them, the Z parameters or pseudo-observables, the de-convoluted cross sections and those dressed with QED radiation, and finally the forward-backward asymmetries. The calculations are...
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 کامل0 v 1 8 O ct 1 99 9 Event generation of large - angle Bhabha scattering at LEP 2 energies
LABSMC Monte Carlo event generator is used to simulate Bhabha scattering at high energies. Different sources of radiative corrections are considered. The resulting precision is discussed.
متن کامل