Observation of S=+1 narrow resonances in the system $K^0_sp$ from p+$C_3H_8$ collision at 10 GeV/c

Details Observation of S=+1 narrow resonances in the system $K^0_sp$ from p+$C_3H_8$ collision at 10 GeV/c Observation of S=+1 narrow resonances in the system $K^0_sp$ from p+$C_3H_8$ collision at 10 GeV/c

2004-03-29

arxiv.org/abs/hep-ex/0403044v7

Nucl.Phys.A755:375-378,2005

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 4 figures

Scientific paper

10.1016/j.nuclphysa.2005.03.041

The 2m propane bubble chamber experimental data have been analyzed to search for an exotic baryon state, the $\Theta^+$ -baryon, in the $pK^0_s$ decay mode for the reaction p+$C_3H_8$ at 10 GeV/c. The $pK^0_s$ invariant mass spectrum shows resonant structures with $M_{K_s^0 p}$=1540$\pm$8, 1613$\pm$10, 1821$\pm$11 MeV/$c^2$ and $\Gamma_{K_s^0 p}$= 9.2$\pm$1.8, 16.1$\pm$4.1, 28.0$\pm$9.4 MeV/$c^2$. The maximal statistical significance of these peaks have been estimated as 5.5$\sigma$,4.8$\sigma$ and 5.0$\sigma$, respectively.

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