J 2007

Electron-Positron annihilation into four charged pions and the a1 rho pi lagrangian

JURÁŇ, Josef and Peter LICHARD

Basic information

Original name

Electron-Positron annihilation into four charged pions and the a1 rho pi lagrangian

Authors

Edition

Physical Review D, US - Spojené státy americké, 2007, 1550-7998

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Confidentiality degree

není předmětem státního či obchodního tajemství

Organization unit

Faculty of Philosophy and Science in Opava

DOI

UT WoS

000251327200053

Keywords in English

electron-positron annihilation, a1 rho pi Lagrangian, cross section

Tags

Tags

International impact, Reviewed

Links

LC07050, research and development project. MSM4781305903, plan (intention).
Změněno: 10/12/2020 08:34, Mgr. Pavlína Jalůvková

Abstract

V originále

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.A two-term phenomenological Lagrangian of the a1 rho pi interaction is used. The mixing angle is determined by fitting the e+e- -> pi+pi-pi+pi- cross section 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 rho -> pi+pi-pi+pi- decay width. When moving to energies above 1 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.