Measurement of the Dalitz plot slope parameters for K- -> pi0 pi0 pi- decay using ISTRA+ detector
I.V. Ajinenko, S.A. Akimenko, G.I. Britvich, K.V. Datsko, A.P. Filin,, A.V. Inyakin, A.S. Konstantinov, V.F. Konstantinov, I.Y. Korolkov, V.M., Leontiev, V.P. Novikov, V.F. Obraztsov, V.A. Polyakov, V.I. Romanovsky, V.I., Shelikhov, N.E. Smirnov, O.G. Tchikilev, V.A. Uvarov
TL;DR
This paper reports precise measurements of the Dalitz plot slope parameters g, h, and k for the decay K- -> pi0 pi0 pi-, using the ISTRA+ detector, providing results consistent with previous data but with improved accuracy.
Contribution
The study presents the first high-precision measurements of Dalitz plot slope parameters for K- decay, reducing uncertainties compared to previous measurements.
Findings
Measured g=0.627±0.004(stat)±0.010(syst)
Measured h=0.046±0.004(stat)±0.012(syst)
Measured k=0.001±0.001(stat)±0.002(syst)
Abstract
The Dalitz plot slope parameters g, h and k for the K- -> pi0 pi0 pi- decay have been measured using in-flight decays detected with the ISTRA+ setup operating in the 25 GeV negative secondary beam of the U-70 PS. About 252 K events with four-momenta measured for the pi- and four involved photons were used for the analysis. The values obtained g=0.627+/-0.004(stat)+/-0.010(syst), h=0.046+/-0.004(stat)+/-0.012(syst), k=0.001+/-0.001(stat)+/-0.002(syst) are consistent with the world averages dominated by K+ data, but have significantly smaller errors.
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