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    Search for S=+1 exotic baryon in γp&rarr;π<sup>+</sup>K<sup>-</sup>K<sup>+</sup>n

    Guo, Lei
    : https://etd.library.vanderbilt.edu/etd-04082004-234959
    http://hdl.handle.net/1803/12057
    : 2004-04-14

    Abstract

    <font size=+1> The reaction γ p &rarr; π<sup>+</sup> K<sup>-</sup>K<sup>+</sup>n has been investigated at Jefferson Lab using a tagged photon beam with an energy range of 3-5.47 GeV. A narrow baryon state with strangeness S=+1 and mass M=1555±; 7±; 10 MeV/c<sup>2</sup> was observed in the (nK<sup>+</sup>)invariant mass spectrum. The width of the peak is consistent with the CLAS resolution (FWHM=26~MeV/c<sup>2</sup> ), and its statistical significance is 7.8 ±; 1.0 σ. A baryon with positive strangeness has necessarily exotic structure and cannot be described in the framework of the naive constituent quark model. The signal is consistent with that predicted by a chiral soliton model for a 5-quark baryon state. Partial Wave Analysis was performed for the three-body mesonic background with the photon energy range of 4.8-5.47 GeV . The analysis demonstrates that the observed signal is unlikely to arise from meson production in the same final state. Interesting features were also observed in the 2<sup>-</sup>, 1<sup>-</sup> and 1<sup>+</sup> partial wave intensity distributions. Due to the low statistics, the resonant nature of these meson waves is not determined.</font>
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