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

G. Balossini·C. M. Carloni Calame·G. Montagna·O. Nicrosini·F. Piccinini
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Abstract

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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G. Balossini, C. M. Carloni Calame, G. Montagna, O. Nicrosini, F. Piccinini. 2006-11-06. Matching perturbative and Parton Shower corrections to Bhabha process at flavour factories. https://doi.org/10.1016/j.nuclphysb.2006.09.022

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