Photon pair production at flavour factories with per mille accuracy

Details Photon pair production at flavour factories with per mille accuracy Photon pair production at flavour factories with per mille accuracy

2008-01-22

arxiv.org/abs/0801.3360v1

Phys.Lett.B663:209-213,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 5 figures, 1 table

Scientific paper

10.1016/j.physletb.2008.04.007

We present a high-precision QED calculation, with 0.1% theoretical accuracy, of two photon production in $e^+ e^-$ annihilation, as required by more and more accurate luminosity monitoring at flavour factories. The accuracy of the approach, which is based on the matching of exact next-to-leading order corrections with a QED Parton Shower algorithm, is demonstrated through a detailed analysis of the impact of the various sources of radiative corrections to the experimentally relevant observables. The calculation is implemented in the latest version of the event generator BabaYaga, available for precision simulations of photon pair production at $e^+ e^-$ colliders of moderately high energies.

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