Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-08-29
Eur.Phys.J.C33:333-347,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, 17 figures. Final version to appear in Eur. Phys. J. C
Scientific paper
10.1140/epjc/s2004-01605-0
The measurement of the pion form factor and, more generally, of the cross section for electron--positron annihilation into hadrons through the radiative return has become an important task for high luminosity colliders such as the $\Phi$- or $B$-meson factories. For detailed understanding and analysis of this reaction, the construction of a Monte Carlo program, PHOKHARA, has been undertaken. Version 2.0 was based on a next-to-leading order (NLO) treatment of the corrections from initial-state radiation (ISR). In the present paper a further extension of PHOKHARA (version 3.0) is described, which incorporates NLO corrections to final-state radiation (FSR). The impact of combined ISR and FSR on various distributions is investigated and methods are presented, which will allow the extraction of the form factor, and even give access to inclusive photon emission due to FSR. The dependence of the results on the model for FSR is discussed and the impact of this contribution on the anomalous magnetic moment of the muon is evaluated.
Czyz Henryk
Grzelinska Agnieszka
Kuhn Johann H.
Rodrigo German
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