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+ | ====== TTP00-16 Four Pion Final States with Tagged Photons at Electron Positron Colliders ====== | ||
+ | |||
+ | |||
+ | < | ||
+ | e^+ e^- \to \gamma + 4 \pi, where the photon is assumed to be observed | ||
+ | in the detector. | ||
+ | tau decays into four pions and electron positron annihilation into | ||
+ | four pions respectively have been found which allow to determine all | ||
+ | four modes after the amplitude for the \pi^+ \pi^- 2 \pi^0 channel has | ||
+ | been fixed. | ||
+ | | ||
+ | | ||
+ | | ||
+ | final state radiation from the charged pions. | ||
+ | | ||
+ | | ||
+ | and 10GeV, corresponding to the energies of DAPHNE, BEBC and of | ||
+ | | ||
+ | after applying realistic cuts, the event rates are sufficiently high | ||
+ | to allow for a precise measurement of R(Q^2) in the region of Q | ||
+ | | ||
+ | | ||
+ | is obtained within the relatively large errors. | ||
+ | </ | ||
+ | |**H. Czyz and J.H. K\" | ||
+ | |** Eur. Phys. J. C 18 497-509 2001 ** | | ||
+ | | {{preprints: | ||
+ | | | |