2017/10/31 by Yun-Hua Chen, De-Liang Yao, Han-Qing Zheng · 1 citation
Physics and Astronomy · #hep-ph #hep-ex #nucl-th
paper · pdf · doi:10.1088/0253-6102/69/1/50
published as Commun. Theor. Phys. 69 (2018) 50 · 10 pages, 4 figures. References added
arxiv created 2017/12/26 · arxiv updated 2017/12/27
The strong and electromagnetic corrections to ρ-ω mixing are calculated using a SU(2) version of resonance chiral theory up to next-to-leading orders in 1/NC expansion, respectively. Up to our accuracy, the effect of the momentum dependence of ρ-ω mixing is incorporated due to the inclusion of loop contributions. We analyze the impact of ρ-ω mixing on the pion vector form factor by performing numerical fit to the data extracted from e+e-→ π+π- and τ→ ντ2π, while the decay width of ω→ π+π- is taken into account as a constraint. It is found that the momentum dependence is significant in a good description of the experimental data. In addition, based on the fitted values of the involved parameters, we analyze the decay width of ω→ π+π-, which turns out to be highly dominated by the ρ-ω mixing effect.