Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2003-09-11
Phys.Atom.Nucl.67:682-687,2004; Yad.Fiz.67:704-709,2004
Physics
High Energy Physics
High Energy Physics - Experiment
Institute of Theoretical and Experimental Physics, B.Cheremyshkinskya 25, Moscow 117259, Russia
Scientific paper
10.1134/1.1707127
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.
Asratyan A. E.
Dolgolenko A. G.
Kubantsev M. A.
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