Observation of a cusp-like structure in the $\gamma p\to K^{+}{\Sigma }^0$ cross section at forward angles and low momentum transfer

Abstract

The $\gamma p\to K^{+}{\Sigma }^0$ differential cross section at extremely forward angles was measured at the BGOOD experiment. A three-quarter drop in strength over a narrow range in energy and a strong dependence on the polar angle of the $K^{+}$ in the centre-of-mass of the reaction is observed at a centre-of-mass energy of 1900\,MeV. Residing close to multiple open and hidden strangeness thresholds, the structure appears consistent with meson-baryon threshold effects which may contribute to the reaction mechanism.

arXiv comment9 pages (including a 2 page appendix of tabulated data), 10 figures

References in corpus (31)

• Hadronic molecules
• Observation of $J/\psi p$ resonances consistent with pentaquark states in ${\Lambda }_b^0\to J/\psi K^{-}p$ decays
• Observation of a narrow pentaquark state, $P_c(4312{)}^{+}$, and of two-peak structure of the $P_c(4450{)}^{+}$
• Chiral Dynamics of the Two Λ(1405) States
• The Spectrum of the Nucleons and the Strange Hyperons and Chiral Dynamics
• SU(3) Chiral Dynamics with Coupled Channels: Eta and Kaon Photoproduction
• Measurement of gamma p --> K+ Lambda and gamma p --> K+ Sigma0 at photon energies up to 2.6 GeV
• On meson resonances and chiral symmetry
• Quark mass dependence of s-wave baryon resonances
• Evidence for a missing nucleon resonance in kaon photoproduction
• Lattice QCD Evidence that the Lambda(1405) Resonance is an Antikaon-Nucleon Molecule
• On baryon resonances and chiral symmetry
• Double-Pionic Fusion of Nuclear Systems and the ABCEffect -- Aproaching a Puzzle by Exclusive and Kinematically Complete Measurements
• The gamma + p to K+ + Lambda and gamma + p to K+ + Sigma0 reactions at forward angles with photon energies from 1.5 to 2.4 GeV
• Diffractive $\varphi$-meson photoproduction on proton near threshold
• Differential cross sections and recoil polarizations for the reaction gamma p -> K+ Sigma0
• Forward-angle K+ Lambda photoproduction in a Regge-plus-resonance approach
• Anomaly in the K^0_S Sigma^+ photoproduction cross section off the proton at the K* threshold
• Baryon resonances and polarization transfer in hyperon photoproduction
• The role of vector-baryon channels and resonances in the $\gamma p\to K^0{\Sigma }^{+}$ and $\gamma n\to K^0{\Sigma }^0$ reactions near the $K^{\ast }\Lambda$ threshold
• Searching for signatures around 1920 MeV of a $N^{\ast }$ state of three hadron nature
• Nuclear-mass dependence of azimuthal beam-helicity and beam-charge asymmetries in deeply virtual Compton scattering
• Search for a hidden strange baryon-meson bound state from $\varphi$ production in a nuclear medium
• Sigma photoproduction in the resonance region
• The BGOOD experimental setup at ELSA
• Energy-independent PWA of the reaction $\gamma p\to K^{+}\Lambda$
• $K^{+}\Lambda$ photoproduction at forward angles and low momentum transfer
• Photoproduction of $\Lambda$ and ${\Sigma }^0$ hyperons off protons with linearly polarized photons at $E_{\gamma }=1.5-3.0$ GeV
• $P_c$-like pentaquarks in hidden strange sector
• Measurement of polarisation observables in $K_s^0{\Sigma }^{+}$ photoproduction off the proton
• Photoproduction evidence for and against hidden-strangeness states near 2 GeV

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