Resummation Study on Decay ρ→ππ in U(2)ₗ× U(2)ᵣ Chiral Theory of Mesons
Huang, Yi-Bin · Yan, Mu-Lin · Wang, Xiao-Jun
Original · EN
We improve O(p⁴) calculation in U(2)ₗ× U(2)ᵣ chiral theory of mesons by resummation calculation for vector mesons physics and restudy decay ρ→ππ. A complete and compact expression for fᵨππ(p²) (up to O(p∞)) is obtained, from which an important non-perturbative conclusion is given based on convergence and unitarity consideration.
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