Observation of narrow baryon resonance in $pK^0_s$ mode in $pA$-interactions at $70 GeV/c$ with SVD-2 setup

Details Observation of narrow baryon resonance in $pK^0_s$ mode in $pA$-interactions at $70 GeV/c$ with SVD-2 setup Observation of narrow baryon resonance in $pK^0_s$ mode in $pA$-interactions at $70 GeV/c$ with SVD-2 setup

2005-10-03

arxiv.org/abs/hep-ex/0510006v1

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 4 figures, First International Workshop "Hadron Structure and QCD", HSQCD-2004, Repino, St. Petersburg, Russia, May 2

Scientific paper

We report on the SVD-2 experiment data analysis aimed to search for an exotic baryon state, the $\Theta^+$-baryon, in a $pK^0_s$ decay mode with IHEP U-70 accelerator proton beam at $70 GeV/c$. A resonant structure with $M=1526\pm3(stat.)\pm 3(syst.)~MeV/c^2$ and $\Gamma < 24 MeV/c^2$ was found in the $pK^0_s$ invariant mass spectrum, with the statistical significance of this peak estimated as $5.6~\sigma$.

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