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Evidence for formation of a narrow pKshort resonance with mass near 1533 MeV in neutrino interactions
A narrow baryon resonance is observed in invariant mass of the pKshort system
formed in neutrino and antineutrino collisions with nuclei. The mass of the
resonance is estimated as (1533+-5)MeV. The observed width is less than 20 MeV,
and is compatible with being entirely due to experimental resolution. The
statistical significance of the signal is near 6.7 standard deviations. As the
position of the observed resonance does not match the mass of any known
\Sigma^{*+} state, we believe that it arises from neutrino production of the
\Theta^+ pentaquark baryon. The analysis is based on the data obtained in past
neutrino experiments with big bubble chambers: WA21, WA25, WA59, E180 and E632.Comment: Institute of Theoretical and Experimental Physics, B.Cheremyshkinskya
25, Moscow 117259, Russi