Search for $Θ^{++}$ Pentaquarks in the Exclusive Reaction $γ p\to K^+K^-p$

Details Search for $Θ^{++}$ Pentaquarks in the Exclusive Reaction $γ p\to K^+K^-p$ Search for $Θ^{++}$ Pentaquarks in the Exclusive Reaction $γ p\to K^+K^-p$

2006-04-28

arxiv.org/abs/hep-ex/0605001v1

Phys.Rev.Lett.97:102001,2006

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.97.102001

The reaction $\gamma p \to pK^+K^-$ was studied at Jefferson Lab with photon energies from 1.8 to 3.8 GeV using a tagged photon beam. The goal was to search for a $\Theta^{++}$ pentaquark, a narrow doubly charged baryon state having strangeness S=+1 and isospin I=1, in the $pK^+$ invariant mass spectrum. No statistically significant evidence of a $\Theta^{++}$ was found. Upper limits on the total and differential production cross section for the reaction $\gamma p \to K^-\Theta^{++}$ were obtained in the mass range from 1.5 to 2.0 GeV/c$^2$, with an upper limit of about 0.15 nb, 95% C.L. for a narrow resonance with a mass $M_{\Theta^{++}}=1.54$ GeV/c$^2$. This result places a very stringent upper limit on the $\Theta^{++}$ width.

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