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

Abstract

The reaction $\gamma p\to p{K}^{+}{K}^{-}$ 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 $p{K}^{+}$ 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.

arXiv comment6 pages, 4 figures

References in corpus (26)

• A Unified Approach to the Classical Statistical Analysis of Small Signals
• Evidence for the positive-strangeness pentaquark ${\Theta }^{+}$ in photoproduction with the SAPHIR detector at ELSA
• Observation of an Exotic Baryon with S=+1 in Photoproduction from the Proton
• Evidence for a narrow |S|=1 baryon state at a mass of 1528 MeV in quasi-real photoproduction
• Evidence for a narrow baryonic state decaying to K0s-p and K0s-pbar in deep inelastic scattering at HERA
• K+ nucleon scattering and exotic S=+1 Baryons
• Understanding Pentaquark States in QCD
• Experimental Limits on the Width of the Reported Theta(1540)+
• Chiral-Soliton Predictions for Exotic Baryons
• Interpretation of the Theta+ as an isotensor pentaquark with weakly decaying partners
• Exotic baryon states in topological soliton models
• New results on the limit for the width of the exotic Theta^+ resonance
• Search for the ${\Theta }^{+}$ pentaquark in the reactions $\gamma p\to {\bar{K}}^0{K}^{+}n$ and $\gamma p\to {\bar{K}}^0{K}^{0}p$
• The pentaquark in K-plus-d total cross section data
• Pentaquark Theta^+(1540) production in gamma N --> K Anti-K N
• Search for the Theta(1540)+ pentaquark using kaon secondary interactions at Belle
• Suppression of Theta^+(J^P=3/2^(+,-)) photoproduction from the proton
• The 27-plet Baryons from Chiral Soliton Models
• Pentaquark decay is suppressed by chirality conservation
• A Phenomenological Lagrangian Approach to Two Kaon Photoproduction and Pentaquark Searches
• Photoproduction of the Theta^+ resonance on the nucleon in a Regge model
• Implications of the Present Bound on the Width of the Theta(1540)
• Search for Higher Flavor Multiplets in Partial Wave Analyses
• Recent Results on Searches for Pentaquark States from STAR at RHIC
• Theta++ from QCD sum rule
• Search for a Theta++ Pentaquark State

Cited by in corpus (6)

• Searching for signatures around 1920 MeV of a $N^{\ast }$ state of three hadron nature
• Results from the N* program at JLab
• Present status on experimental search for pentaquarks
• KKbar photoproduction from protons
• A Search for Sigma^0_5, N^0_5 and Theta^++ Pentaquark States
• Systematic study of pentaquark states: $qqq-q\bar{q}$ configuration