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Detailed study of the $\mathrm{K^{\pm}} \rightarrow π^{0} π^{0} \mathrm{e^{\pm}} ν$ ($\mathrm{K}_{\mathrm{e}4}^{00}$) decay properties

A sample of 65210 $\mathrm{K^{\pm}} \rightarrow π^{0} π^{0} \mathrm{e^{\pm}} ν$ ($\mathrm{K}_{\mathrm{e}4}^{00}$) decay candidates with $1\%$ background contamination has been collected in 2003$-$2004 by the NA48/2 collaboration at the CERN SPS. A study of the differential rate provides the first measurement of the hadronic form factor variation in the plane $(M_{ππ}^2,M_{eν}^2)$ and brings evidence for a cusp-like structure in the distribution of the squared $π^{0} π^{0}$ invariant mass around $4m_{π^+}^2$. Exploiting a model independent description of this form factor, the branching ratio, inclusive of radiative decays, is obtained using the $\mathrm{K^{\pm}} \rightarrow π^{0} π^{0} π^{\pm}$ decay mode as normalization. It is measured to be BR($\mathrm{K}_{\mathrm{e}4}^{00}$) = $(2.552 \pm 0.010_{stat} \pm 0.010_{syst} \pm 0.032_{ext} ) \times 10^{-5}$, which improves the current world average precision by an order of magnitude while the $1.4\%$ relative precision is dominated by the external uncertainty from the normalization mode. A comparison with the properties of the corresponding mode involving a $π^{+} π^{-}$ pair ($\mathrm{K}_{\mathrm{e}4}^{+-}$) is also presented.