# Search for $\Theta^{++}$ Pentaquarks in the Exclusive Reaction $\gamma p\to K^+K^-p$

Abstract : 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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http://hal.in2p3.fr/in2p3-00105418
Contributor : Dominique Girod <>
Submitted on : Wednesday, October 11, 2006 - 9:40:32 AM
Last modification on : Wednesday, September 16, 2020 - 3:59:37 PM

### Citation

V. Kubarovsky, M. Battaglieri, R. de Vita, J. Goett, L. Guo, et al.. Search for $\Theta^{++}$ Pentaquarks in the Exclusive Reaction $\gamma p\to K^+K^-p$. Physical Review Letters, American Physical Society, 2006, 97, pp.102001. ⟨10.1103/PhysRevLett.97.102001⟩. ⟨in2p3-00105418⟩

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