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Matching perturbative and Parton Shower corrections to Bhabha process at flavour factories

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arxiv hep-ph/0607181 v2 submitted 2006-07-16 hep-ph hep-ex

Matching perturbative and Parton Shower corrections to Bhabha process at flavour factories

G. Balossini (1) , C.M. Carloni Calame (2 , 1) , G. Montagna (1 , 2) , O. Nicrosini (2 , F. Piccinini (2 , 1) ((1) Dipartimento di Fisica Nucleare e Teorica
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Universita' di Pavia (2) Istituto Nazionale di Fisica Nucleare Sezione di Pavia)
This is my paper
classification hep-ph hep-ex
keywords bhabhacalculationcorrectionsprocessaccuracyfactoriesflavourgenerator
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We report on a high-precision calculation of the Bhabha process in Quantum Electrodynamics, of interest for precise luminosity determination of electron-positron colliders involved in R measurements in the region of hadronic resonances. The calculation is based on the matching of exact next-to-leading order corrections with a Parton Shower algorithm. The accuracy of the approach is demonstrated in comparison with existing independent calculations and through a detailed analysis of the main components of theoretical uncertainty, including two-loop corrections, hadronic vacuum polarization and light pair contributions. The calculation is implemented in an improved version of the event generator BABAYAGA with a theoretical accuracy of the order of 0.1%. The generator is now available for high-precision simulations of the Bhabha process at flavour factories.

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