Electron-positron annihilation into four pions and the a1-rho-pi Lagrangian

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21670%2F09%3A00156561" target="_blank" >RIV/68407700:21670/09:00156561 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Electron-positron annihilation into four pions and the a1-rho-pi Lagrangian
Original language description
The excitation curve of e+e- annihilation into four charged pions in the rho(770)region is calculated using three existing models with rho mesons and pions in intermediate states supplemented by Feynman diagrams with the a1(1260)pi intermediate states. Atwo-term phenomenological Lagrangian of the a1-rho-pi interaction is used. The mixing angle is determined by fitting the e+e- (goes to) pi+pi-pi+pi- cross section data of the Novosibirsk CMD-2 collaboration and also its combination with the low-energy part of the BaBar collaboration data. It is shown that the inclusion of the a1-pi intermediate states succeeds in obtaining a good agreement with the data on both cross section and the rho0 (goes to) pi+pi-pi+pi- decay width. When moving to energies above1~GeV, the rho(1450) and rho(1700) resonances are taken into account to get excellent agreement with the BaBar data over the full energy range up to 4.5~GeV.
Czech name
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Czech description
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Project
<a href="/en/project/LC07050" target="_blank" >LC07050: Center of experimental nuclear astrophysics and nuclear physics</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year
2009
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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