Chinese Physics C > 1994, Vol. 18 > Issue(7): 583-590

Angular Distribution of Process e⁺e^－→τ⁺τ^－,τ^－→a₁υτ,a₁→ρπ and Characteristics of a₁Meson

Institute of High Energy Physics,Academia Sinica,Beijing 100039

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Abstract：
The density matrix and helicity formalism of angular distribution of process e ⁺e ^－→τ ⁺τ ^－,τ ^－→a ₁υ _τ,a ₁→ρπ have been obtained. The helicity amplitude ratios corresponding to the form factors of the W-a ₁transition and the strong interaction vertex a ₁ρπ are determined by the sectionalized fitting method. A model-independent method for determining the mass and width of the wide resonance a ₁is given.

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Yu Hong, Shen Qixing and Zhang Lin. Angular Distribution of Process e ⁺e ^－→τ ⁺τ ^－,τ ^－→a ₁υτ,a ₁→ρπ and Characteristics of a ₁Meson[J]. Chinese Physics C, 1994, 18(7): 583-590.

Yu Hong, Shen Qixing and Zhang Lin. Angular Distribution of Process e ⁺e ^－→τ ⁺τ ^－,τ ^－→a ₁υτ,a ₁→ρπ and Characteristics of a ₁Meson[J]. Chinese Physics C, 1994, 18(7): 583-590. shu

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Received: 1900-01-01
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Angular Distribution of Process e⁺e^－→τ⁺τ^－,τ^－→a₁υτ,a₁→ρπ and Characteristics of a₁Meson

Corresponding author:Yu Hong,

Institute of High Energy Physics,Academia Sinica,Beijing 100039

Received Date:1900-01-01
Accepted Date:1900-01-01
Available Online:1994-07-05

Abstract:The density matrix and helicity formalism of angular distribution of process e⁺e^－→τ⁺τ^－,τ^－→a₁υ_τ,a₁→ρπ have been obtained. The helicity amplitude ratios corresponding to the form factors of the W-a₁transition and the strong interaction vertex a₁ρπ are determined by the sectionalized fitting method. A model-independent method for determining the mass and width of the wide resonance a₁is given.