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- W4299862006 abstract "The NA48/2 and $text{NA62}text{-}{text{R}_text{K}}$ experiments at the CERN SPS collected a large sample of charged kaon decays in flight. $text{NA62}text{-}{text{R}_text{K}}$ was running in 2007-08 with a highly efficient minimum bias trigger for decays into electrons. A preliminary measurement of the electromagnetic transition form factor slope of the $pi^0$ from $1.05times 10^{6}$ fully reconstructed $pi^0$ Dalitz decays is presented. The obtained value $a = (3.70 pm 0.53_text{stat} pm 0.36_text{syst})times 10^{-2}$ represents a $5.8sigma$ observation of a non-zero slope in the time-like region of momentum transfer. An upper limit on the rate of a lepton number violating decay $K^pmtopi^mpmu^pmmu^pm$ is reported from $sim 1.6times 10^{11} K^pm$ decays at NA48/2 in 2003-04: $mathcal{B} < 8.6times 10^{-11}$ at $90 %$ CL. Searches for heavy sterile neutrino $N_4$ and inflaton $chi$ resonances in $K^pmtopimumu$ decays are reported. No signal is observed and upper limits on the products $mathcal{B}(K^pmtomu^pm N_4)mathcal{B}(N_4topi^mpmu^pm)$ and $mathcal{B}(K^pmtopi^pm chi)mathcal{B}(chitomu^+mu^-)$ are set in the range $10^{-10}-10^{-9}$ for resonance lifetimes up to $100~text{ps}$. The result of a search for dark photon with the same sample of decays is also reported. In the absence of observed signal, the limits on the mixing parameter $varepsilon^2$ in the range $9-70~text{MeV/c}^{2}$ are improved." @default.
- W4299862006 created "2022-10-03" @default.
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- W4299862006 date "2017-01-24" @default.
- W4299862006 modified "2023-09-23" @default.
- W4299862006 title "Recent results from NA48/2 and NA62 experiments at CERN" @default.
- W4299862006 doi "https://doi.org/10.48550/arxiv.1701.06979" @default.
- W4299862006 hasPublicationYear "2017" @default.
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