Article ID Journal Published Year Pages File Type
8193767 Physics Letters B 2010 7 Pages PDF
Abstract
The τ→πππντ decay is driven by the hadronization of the axial-vector current. Within the resonance chiral theory, and considering the large-NC expansion, this process has been studied in Ref. [1] (D. Gómez Dumm, A. Pich, J. Portolés, 2004). In the light of later developments we revise here this previous work by including a new off-shell width for the lightest a1 resonance that provides a good description of the τ→πππντ spectrum and branching ratio. We also consider the role of the ρ(1450) resonance in these observables. Thus we bring in an overall description of the τ→πππντ process in excellent agreement with our present experimental knowledge.
Related Topics
Physical Sciences and Engineering Physics and Astronomy Nuclear and High Energy Physics
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