Measurement of the Dalitz plot slope parameters for K−→π0π0π− decay using ISTRA+ detector
Physics Letters B2003Vol. 567(3-4), pp. 159–166
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I. Ajinenko, S.A. Akimenko, G. I. Britvich, K. Datsko, A. P. Filin, A.V. Inyakin, A. S. Konstantinov, В.Ф. Константинов, I. Y. Korolkov, V. M. Leontiev, V. P. Novikov, V. Obraztsov, V. A. Polyakov, V. I. Romanovsky, V. I. Shelikhov, N.E. Smirnov, O. G. Tchikilev, V. Uvarov, O. P. Yushchenko, В.Н. Болотов, С. В. Лаптев, A. R. Pastsjak, A. Yu. Polyarush, R. Kh. Sirodeev
Abstract
The Dalitz plot slope parameters g, h and k for the K−→π0π0π− 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 π− 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.