A novel interpretation of the "${\Theta }^{+}(1540)$ pentaquark" peak

Abstract

We use a theoretical model of the $\gamma d\to K^{+}{K}^{-}np$ reaction adapted to the experiment done at LEPS where a peak was observed and associated to the ${\Theta }^{+}(1540)$ pentaquark. The study shows that the method used in the experiment to associate momenta to the undetected proton and neutron, together with the chosen cuts, necessarily creates an artificial broad peak in the assumed $K^{+}n$ invariant mass in the region of the claimed ${\Theta }^{+}(1540)$, such that the remaining strength seen for the experimental peak is compatible with a fluctuation of 2$\sigma$ significance.

Published in Phys. Rev. Lett

References in corpus (2)

• Evidence of the Θ^+ in the γd \to K^+K^-pn reaction
• Study of the $\gamma d\to K^{+}{K}^{-}np$ reaction and an alternative explanation for the "${\Theta }^{+}(1540)$ pentaquark" peak

Cited by in corpus (16)

• Pentaquark and Tetraquark states
• An updated review of the new hadron states
• Threshold cusps and triangle singularities in hadronic reactions
• Studying Exotic Hadrons in Heavy Ion Collisions
• Comprehensive analysis of the wave function of a hadronic resonance and its compositeness
• Eta-meson production in the resonance energy region
• The ${\Lambda }_b\to J/\psi K^0\Lambda$ reaction and a hidden-charm pentaquark state with strangeness
• QCD and the Strange Baryon Spectrum
• Spectrum of the doubly charmed molecular pentaquarks in chiral effective field theory
• On the hidden charm pentaquark-s in ${\Lambda }_b\to J/\psi K^{-}p$ decay
• High-resolution search for the ${\Theta }^{+}$ pentaquark via a pion-induced reaction at J-PARC
• Colour Fields of the Static Pentaquark System Computed in SU(3) Lattice QCD
• A study of the $KN$-$K^{\ast }N$ coupled systems
• 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
• Critical view of the claimed ${\Theta }^{+}$ pentaquark