Search for $Θ^+(1540)$ pentaquark in high statistics measurement of $γp \to \bar K^0 K^+ n$ at CLAS

Details Search for $Θ^+(1540)$ pentaquark in high statistics measurement of $γp \to \bar K^0 K^+ n$ at CLAS Search for $Θ^+(1540)$ pentaquark in high statistics measurement of $γp \to \bar K^0 K^+ n$ at CLAS

2005-10-22

arxiv.org/abs/hep-ex/0510061v1

Phys.Rev.Lett.96:042001,2006

Physics

High Energy Physics

High Energy Physics - Experiment

Submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.96.042001

The exclusive reaction $\gamma p \to \bar K^0 K^+ n$ was studied in the photon energy range between 1.6-3.8 GeV searching for evidence of the exotic baryon $\Theta^+(1540)\to nK^+$. The decay to $nK^+$ requires the assignment of strangeness $S=+1$ to any observed resonance. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility corresponding to an integrated luminosity of 70 $pb^{-1}$. No evidence for the $\Theta^+$ pentaquark was found. Upper limits were set on the production cross section as function of center-of-mass angle and $nK^+$ mass. The 95% CL upper limit on the total cross section for a narrow resonance at 1540 MeV was found to be 0.8 nb.

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