Electron-positron annihilation into four charged pions and the a1ρπ Lagrangian

被引：21

作者：

Lichard, Peter

Juran, Josef

机构：

[1] Silesian Univ, Inst Phys, Opava, Czech Republic

[2] Czech Tech Univ, Inst Expt & Appl Phys, Prague 12000, Czech Republic

来源：

PHYSICAL REVIEW D | 2007年 / 76卷 / 09期

关键词：

D O I：

10.1103/PhysRevD.76.094030

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 a(1)(1260)pi intermediate states. A two-term phenomenological Lagrangian of the a(1)rho pi interaction is used. The mixing angle is determined by fitting the e(+)e(-)->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 a(1)pi intermediate states succeeds in obtaining a good agreement with the data on both cross section and the rho(0)->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.

引用

页数：12

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