Measurements of the Dalitz Plot Parameters for $K^{\pm}\toπ^{\pm}π^0π^0$ Decays

Details Measurements of the Dalitz Plot Parameters for $K^{\pm}\toπ^{\pm}π^0π^0$ Decays Measurements of the Dalitz Plot Parameters for $K^{\pm}\toπ^{\pm}π^0π^0$ Decays

2005-09-14

arxiv.org/abs/hep-ex/0509017v1

JETPLett.82:675-678,2005; PismaZh.Eksp.Teor.Fiz.82:771-774,2005

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages, 5 figures

Scientific paper

10.1134/1.2171718

The $g$, $h$, and $k$ Dalitz plot parameters, which are coefficients in a series expansion of the squared module of the matrix element $|M(u,v)|^{2} \propto 1 + gu + hu^{2} + kv^{2}$ ($u$, $v$ are invariant variables), have been measured for $K^{\pm}\to \pi^{\pm} \pi^{0} \pi^{0}$ decays using $35 GeV/c$ hadron beams at the IHEP (Protvino) accelerator. Dependences of parameters and fit quality on the $\pi^0\pi^0$ mass cut were investigated. The results point to the important role of $\pi^+\pi^- \to \pi^0\pi^0$ charge exchange scattering near the $\pi^0\pi^0$ mass threshold. The comparison of our data with previous measurements is presented.

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