Structure Functions in the Decay $τ^{\mp}\to τ^{\mp}π^{0}π^{0}ν_τ$

Details Structure Functions in the Decay $τ^{\mp}\to τ^{\mp}π^{0}π^{0}ν_τ$ Structure Functions in the Decay $τ^{\mp}\to τ^{\mp}π^{0}π^{0}ν_τ$

1999-08-06

arxiv.org/abs/hep-ex/9908030v1

Phys.Rev.D61:052004,2000

Physics

High Energy Physics

High Energy Physics - Experiment

21 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS

Scientific paper

10.1103/PhysRevD.61.052004

Using the CLEO II detector operating at the CESR e+e- collider, we have measured the structure functions in the decay tau+/- --> pi+/- pi0 pi0 nu, based on a sample corresponding to 4*10E6 produced tau-pair events. We determine the integrated structure functions, which depend only on the three pion invariant mass, as well as the structure functions differential in the Dalitz plot. We extract model independent limits on non-axial-vector contributions from the measured structure functions as less than 16.6% of the total branching fraction, at the 95% confidence level. Separating the non-axial-vector contributions into scalar and vector contributions, we measure that scalars (vectors) contribute with less than 9.4% (7.3%) to the total branching ratio, at the 95% confidence level.

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