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SUMMARY:Four-pion production in e(+) e(-) annihilation
DTSTART;VALUE=DATE-TIME:20020418T103000Z
DTEND;VALUE=DATE-TIME:20020418T113000Z
DTSTAMP;VALUE=DATE-TIME:20261109T031034Z
UID:indico-event-1261@indico.ific.uv.es
DESCRIPTION:We have calculated the processes e(+) e(-) -> 4 pion and tau -
 > nu_tau 4 pion to O(p^4) in the low-energy expansion of the standard mode
 l. The chiral amplitudes of O(p^4) can be extended via resonance exchange 
 to energies arount 1 GeV. Higher-order effects have been included in the f
 orm of w(782)\, a_1(1260) and double rho exchange and by performing a resu
 mmation of the pion form factor. The predicted cross sections and the bran
 ching ratios BR(rho^0 -> 4pion) are in good agreement with available data.
 \n\nhttps://indico.ific.uv.es/event/1261/
LOCATION:Edf. Institutos de Investigación Sala Seminarios IFIC
URL:https://indico.ific.uv.es/event/1261/
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