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Search for light pseudoscalar sgoldstino in K- decays

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arxiv hep-ex/0308061 v2 pith:YGZREFIC submitted 2003-08-25 hep-ex

Search for light pseudoscalar sgoldstino in K- decays

O.Tchikilev , I. Ajinenko , S. Akimenko , I. Britvich , G. Britvich , K. Datsko , A. Filin , A. Inyakin
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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 S. Laptev A. Pastsjak A. Polyarush R. Sirodeev
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keywords lightpipi0ppseudoscalarsearchsgoldstinoaroundbeambeen
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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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