Photoproduction of $K^{+}\Lambda (1405)\to K^{+}{\pi }^0{\Sigma }^0$ extending to forward angles and low momentum transfer

Abstract

$K^{+}\Lambda (1405)$ photoproduction has been studied at the BGOOD experiment via the all neutral decay, $\Lambda (1405)\to {\Sigma }^0{\pi }^0$. The unique BGOOD experimental setup allows both the cross section and $\Lambda (1405)$ invariant mass distribution (line shape) to be measured over a broad $K^{+}$ polar angle range, extending to extreme forward $K^{+}$ angles unattainable at previous experiments. Evidence is provided for the role of a triangle singularity driven by the $N^{\ast }(2030)$ resonance, which appears to contribute significantly to $K^{+}\Lambda (1405)$ photoproduction. This is observed in both the angular distributions and the integrated cross section which was determined with unprecedented energy resolution. The measured line shape is also in agreement with the previous results of CLAS and ANKE, and is consistent with two poles derived in $\chi$PT based models.

References in corpus (5)

• Lattice QCD Evidence that the Lambda(1405) Resonance is an Antikaon-Nucleon Molecule
• Constraints on the chiral unitary $\bar{K}N$ amplitude from $\pi \Sigma K^{+}$ photoproduction data
• Measurement of the Sigma pi photoproduction line shapes near the Lambda(1405)
• Lineshape of the Lambda(1405) Hyperon Measured Through its Sigma0 pion0 Decay
• Photoproduction of Lambda(1405) and Sigma^{0}(1385) on the proton at E_γ= 1.5-2.4 GeV

Cited by in corpus (6)

• Cross-channel constraints on resonant antikaon-nucleon scattering
• Two-pole nature of the $\Lambda (1405)$ from lattice QCD
• Lattice QCD study of $\pi \Sigma -\bar{K}N$ scattering and the $\Lambda (1405)$ resonance
• Pole position of $\Lambda (1405)$ measured in $d(K^{-},n)\pi \Sigma$ reactions
• Decay of the $\Lambda (1405)$ Hyperon to ${\Sigma }^0{\pi }^0$ Measured at GlueX
• Evidence for a $\bar{K}NN$ quasi-bound state in the $\gamma d\to K^0\Lambda p$ reaction