First observation of $\gamma \gamma \to p\bar{p}{K}^{+}{K}^{-}$ and search for exotic baryons in $pK$ systems

Abstract

The process $\gamma \gamma \to p\bar{p}{K}^{+}{K}^{-}$ and its intermediate processes are measured for the first time using a 980~fb${}^{-1}$ data sample collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. The production of $p\bar{p}{K}^{+}{K}^{-}$ and a $\Lambda (1520{)}^0(\bar{\Lambda }(1520{)}^0)$ signal in the $p{K}^{-}$~($\bar{p}{K}^{+}$) invariant mass spectrum are clearly observed. However, no evidence for an exotic baryon near 1540~MeV/$c^2$, denoted as $\Theta (1540{)}^0$~($\bar{\Theta }(1540{)}^0$) or $\Theta (1540{)}^{++}$~($\Theta (1540{)}^{--}$), is seen in the $p{K}^{-}$~($\bar{p}{K}^{+}$) or $p{K}^{+}$~($\bar{p}{K}^{-}$) invariant mass spectra. Cross sections for $\gamma \gamma \to p\bar{p}{K}^{+}{K}^{-}$, $\Lambda (1520{)}^0\bar{p}{K}^{+}+c.c.$ and the products $σ(γγ\to Θ(1540)^0 \bar{p} K^+ +c.c.)\BR(Θ(1540)^0 \to p K^{-})$ and $σ(γγ\to Θ(1540)^{++} \bar{p} K^- +c.c.)\BR(Θ(1540)^{++}\to p K^{+})$ are measured. We also determine upper limits on the products of the ${\chi }_{c0}$ and ${\chi }_{c2}$ two-photon decay widths and their branching fractions to $p\bar{p}{K}^{+}{K}^{-}$ at the 90\% credibility level.

arXiv comment9 pages, 9 figures

References in corpus (23)

• Big-Bang Nucleosynthesis
• Heavy quarkonium: progress, puzzles, and opportunities
• Observation of $J/\psi p$ resonances consistent with pentaquark states in ${\Lambda }_b^0\to J/\psi K^{-}p$ decays
• Observation of a charged charmoniumlike structure in e+e- to pi+pi-J/psi at \sqrt{s}=4.26 GeV
• Evidence for Narrow S=+1 Baryon Resonance in Photo-production from Neutron
• Study of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ and Observation of a Charged Charmonium-like State at Belle
• Observation of a resonance-like structure in the pi^+- psi' mass distribution in exclusive B-->K pi^+- psi' decays
• QCD and strongly coupled gauge theories: challenges and perspectives
• Observation of a charged charmoniumlike structure Z_c(4020) and search for the Z_c(3900) in e+e- to pi+pi-h_c
• Identifying exotic hidden-charm pentaquarks
• The New Pentaquarks in the Diquark Model
• The Pentaquark Candidates in the Dynamical Diquark Picture
• $\bar{D}{\Sigma }_c^{\ast }$ and ${\bar{D}}^{\ast }{\Sigma }_c$ interactions and the LHCb hidden-charmed pentaquarks
• Observation of two resonance-like structures in the pi+ chi_c1 mass distribution in exclusive B0-bar --> K- pi+ chi_c1 decays
• Observation of a new charged charmoniumlike state in B -> J/psi K pi decays
• Electron Identification in Belle
• Looking for a hidden-charm pentaquark state with strangeness $S=-1$ from ${\Xi }_b^{-}$ decay into $J/\psi K^{-}\Lambda$
• Non-strange and strange pentaquarks with hidden charm
• Pentaquarks and resonances in the $pJ/\psi$ spectrum
• Study of charmonia in four-meson final states produced in two-photon collisions
• Testing the ${\chi }_{c1}p$ composite nature of the $P_c(4450)$
• Present status on experimental search for pentaquarks
• Prospects for Pentaquark Searches in $e^{+}{e}^{-}$ Annihilations and $\gamma \gamma$ Collisions

Cited by in corpus (2)

• Feasibility study of the $K^{+}d\to K^{0}pp$ reaction for the "${\Theta }^{+}$" pentaquark
• $N^{\ast }$ states with hidden charm and a three-body nature