Isospin Decomposition of the Photoproduced Σπ System Near the Λ(1405)

Abstract

Recent experimental results for the reaction γ+ p \to K^+ + Σ+ π from CLAS at Jefferson Lab are discussed. It was found that the mass distributions or "line shapes" of the three charge combinations Σ^+ π^-, Σ^0 π^0 and Σ^- π^+ differ significantly. Our results show that the Λ(1405), as the I=0 constituent of the reaction, must be accompanied by an I > 0 component. We discuss phenomenological fits to the data to test the possible forms and magnitudes of these amplitudes. A two-amplitude I=0 fit of Breit-Wigner form to the Σ^0π^0 channel alone works quite well. The addition of a single I=1 amplitude works fairly well to model all the line shapes simultaneously.

9 pages, 7 figures; Accepted by Nuclear Physics A; Proceedings of "HYP2012", XI International Conference on Hypernuclear and Strange Particle Physics

References in corpus (3)

• 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 (10)

• Differential Photoproduction Cross Sections of the Sigma0(1385), Lambda(1405), and Lambda(1520)
• On the isospin 0 and 1 resonances from $\pi \Sigma$ photoproduction data
• Role of a triangle singularity in the $\gamma p\to K^{+}\Lambda (1405)$ reaction
• Spin and parity measurement of the Lambda(1405) baryon
• First Observation of the $\Lambda (1405)$ Line Shape in Electroproduction
• Hadron spectroscopy from strangeness to charm and beauty
• Are the chiral based $\bar{K}N$ potentials really energy dependent?
• Investigation of the Lambda(1405) line shape observed in pp collisions
• Recent developments in antikaon-nucleon dynamics
• Polarization of $\Lambda (1405)$ in the $\gamma p\to K^{+}\pi \Sigma$ reaction