Abstract
The Monte Carlo event generator BabaYaga has been developed in the last decade for high precision simulation of QED processes (e + e − → e + e − , e + e − → μ + μ − and e + e − → γγ ) at flavour factories, mainly for luminometry purposes, with an estimated theoretical accuracy at the 0.1% level or better. The relevant QED radiative corrections are included by means of a QED Parton Shower matched with exact next-to-leading order corrections to reach the required accuracy. The main theoretical framework is overviewed and the status of the generator is summarized.
Highlights
The knowledge of the luminosity L is a key ingredient for any measurement at e+e− machines
The Monte Carlo event generator BabaYaga has been developed in the last decade for high precision simulation of QED processes (e+e− → e+e−, e+e− → μ+μ− and e+e− → γγ) at flavour factories, mainly for luminometry purposes, with an estimated theoretical accuracy at the 0.1% level or better
The latter requires the inclusion of the relevant radiative corrections (RCs) in the cross sections calculation and their implementation into Monte Carlo (MC) event generators (EGs) in order to account for experimental event selection criteria
Summary
The knowledge of the luminosity L is a key ingredient for any measurement at e+e− machines. QED processes are the best choice because of their clean signal, low background and the possibility to push the theoretical accuracy up to the 0.1% level or better The latter requires the inclusion of the relevant radiative corrections (RCs) in the cross sections calculation and their implementation into Monte Carlo (MC) event generators (EGs) in order to account for experimental event selection criteria. Where S V stands for soft and virtual photon corrections, H for non-soft real photon corrections, [α, PS ] stands for the O(α) expansion of the PS contribution, i runs over the emitted photons and dσ0 is the lowest-order differential cross section With these definitions, the matched differential cross section can be written in the form dσ∞matched = Π(Q2, ε) FS V. which is the master formula according to which event generation and cross section calculation are performed in BabaYaga@NLO. Some numerical results and the estimate of the theoretical accuracy of the approach are sketched
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