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 (19)

• Hadronic molecules
• Chiral dynamics in the presence of bound states: kaon-nucleon interactions revisited
• Non perturbative chiral approach to s-wave \bar{K}N interactions
• Chiral Dynamics of the Two Λ(1405) States
• A New Measurement of Kaonic Hydrogen X rays
• The nature of the Lambda(1405) resonance in chiral dynamics
• 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
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• Measurement of the Sigma pi photoproduction line shapes near the Lambda(1405)
• Kaonic hydrogen X-ray measurement in SIDDHARTA
• 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
• Baryonic resonances close to the Kbar-N threshold: the case of Lambda(1405) in pp collisions
• Anomaly in the K^0_S Sigma^+ photoproduction cross section off the proton at the K* threshold
• 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
• Spin and parity measurement of the Lambda(1405) baryon
• K^0 pi^0 Sigma^+ and K^*0 Sigma^+ photoproduction off the proton
• The BGOOD experimental setup at ELSA

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