Search for light pseudoscalar sgoldstino in K- decays
O.Tchikilev, I. Ajinenko, S. Akimenko, I. Britvich, G. Britvich, K., Datsko, A. Filin, A. Inyakin, A. Konstantinov, V. Konstantinov, I. Korolkov,, V. Leontiev, V. Novikov, V. Obraztsov, V. Polyakov, V. Romanovsky, V., Shelikhov, N. Smirnov, V. Uvarov, O. Yushchenko, V. Bolotov
TL;DR
This paper reports a search for light pseudoscalar sgoldstino particles in K- decays, setting upper limits on their production rate in specific decay channels using data from the ISTRA+ detector.
Contribution
It provides the first experimental upper limits on the branching ratio of K- decays involving pseudoscalar sgoldstino production in a certain mass range.
Findings
No signal observed for sgoldstino production.
Upper limit on branching ratio around 9×10^-6 for masses up to 200 MeV.
Excludes certain mass regions near π0 mass.
Abstract
A search for the light pseudoscalar sgoldstino production in the three body K- decay K-->pipi0P has been performed with the ISTRA+ detector exposed to the 25 GeV negative secondary beam of the U70 proton synchrotron. No signal is seen. An upper limit for the branching ratio Br(K->pipi0P), at 90% confidence level, is found to be around 9*10**-6 in the effective mass m(P) range from 0 till 200 MeV, excluding the region near m(pi0) where it degrades to 3.5*10**-5.
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