Measuring sigma(e+ e- --> hadrons) with Tagged Photons at Electron Positron Colliders

Details Measuring sigma(e+ e- --> hadrons) with Tagged Photons at Electron Positron Colliders Measuring sigma(e+ e- --> hadrons) with Tagged Photons at Electron Positron Colliders

2001-01-10

arxiv.org/abs/hep-ph/0101100v1

Nucl.Phys.Proc.Suppl. 98 (2001) 289-296

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex, Talk Presented at the Sixth Workshop on Tau Lepton Physics, Victoria, Canada, The complete paper is also available via

Scientific paper

10.1016/S0920-5632(01)01237-3

A Monte Carlo generator has been constructed to simulate the reaction e+ e- --> gamma + 2 pions and gamma + 4 pions, where the photon is assumed to be observed in the detector. Predictions are presented for cms energies of 1GeV, 3GeV and 10GeV, corresponding to the energies of DAPHNE, BEBC and of B-meson factories. The event rates are sufficiently high to allow for a precise measurement of R(Q^2) in the region of Q between approximately 1GeV and 2.5GeV. Estimates for the kinematic breaking of isospin relations between different channels as a consequence of the mass difference between charged and neutral pions are given.

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