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First results on a search for light pseudoscalar sgoldstino in K- decays

I. V. Ajinenko
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Abstract

A search for the light pseudoscalar sgoldstino production in three-body K- decay K- --> pi-pi0 P has been performed with the ISTRA+ detector exposed to the 25 GeV negative secondary of the U-70 proton synchrotron. No signal is seen. Upper limits for the branching ratio at 90% confidence level vary between 2.0 10**-5 and 0.5 10**-5 in the effective mass m(P) range from 0 up to 190 MeV. Our results improve the limits published by the E787 Collaboration in the mass interval between 0 and 120 MeV and are the first ones at higher masses.

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I. V. Ajinenko. 2002-12-25. First results on a search for light pseudoscalar sgoldstino in K- decays. https://arxiv.org/abs/hep-ex/0212060

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