Resonant formation of Lambda(1405) by stopped-K- absorption in deuteron

Abstract

To solve the current debate on the position of the quasi-bound K^-p state, namely, "Lambda(1405) or Lambda*(1420)", we propose to measure the T_{21} = T_{Sigma-pi \leftarrow Kbar-N} Sigma-pi invariant-mass spectrum in stopped-K- absorption in deuteron, since the spectrum, reflecting the soft and hard deuteron momentum distribution, is expected to have a narrow quasi-free component with an upper edge of M = 1430 MeV/c^2, followed by a significant "high-momentum" tail toward the lower mass region, where a resonant formation of Lambda(1405) of any mass and width in a wide range is revealed. We introduce a "deviation" spectrum as defined by DEV = OBS (observed or calculated) / QF (non-resonant quasi-free), in which the resonant component can be seen as an isolated peak free from the QF shape.

7 pages, 6 figures

References in corpus (12)

• The Cosmological Parameters 2006
• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• Effective Kbar N interaction based on chiral SU(3) dynamics
• K^- p scattering length from scattering experiments
• Lineshape of the Lambda(1405) Hyperon Measured Through its Sigma0 pion0 Decay
• Kaonic production of Lambda(1405) off deuteron target in chiral dynamics
• The role of the $\Lambda (1405)$ in the $pp\to p{K}^{+}\Lambda (1405)$ reaction
• Experimental confirmation of the Lambda(1405) Ansatz from resonant formation of a K-p quasi-bound state in K- absorption by 3He and 4He
• Emission spectra and invariant masses of Lambda and p in the stopped-K-NN absorption process in 4He and 6Li
• Single-pole nature of Lambda (1405) and structure of K-pp
• Isospin mixing effects in low-energy $\bar{K}N-\pi \Sigma$ interaction
• Kaonic Nuclear Systems KbarN and KbarNN as Decaying States

Cited by in corpus (12)

• Baryonic resonances close to the Kbar-N threshold: the case of Lambda(1405) in pp collisions
• Faddeev-Chiral Unitary Approach to the $K^{-}d$ scattering length
• Single-pole nature of Lambda (1405) and structure of K-pp
• Production of hyperon resonances induced by kaon on a deuteron target
• Three- and four-body kaonic nuclear states: Binding energies and widths
• Theoretical analysis of Lambda(1405) --> (Sigma pi)^0 mass spectra produced in p+p --> p + Lambda(1405) + K^+ reactions
• Signature of the $\Lambda (1405)$ resonance in neutron spectra from the $K^{-}+d$ reaction
• Mini-Proceedings of ECT Workshop "Strangeness in Nuclei"
• Structure of $\Lambda$(1405) resonance and $\gamma p\to K^{+}+(\pi \Sigma {)}^0$ reaction
• Deduction of $M(Sigmapi)$ for $Lambda(1405)$ with mixed $T_{Sigmapileftarrow{K}^{-}p}and{T}_{SigmapileftarrowSigmapi}$ from Hemingway's data
• Strong binding and shrinkage of single and double kbar~nuclear systems (K^-pp, K^-ppn, K^-K^-p and K^-K^-pp) predicted by Faddeev-Yakubovsky calculations
• Investigation of the $\bar{K}$--${}^6$Li Interaction and the Search for the $\Lambda (1405)$ Resonance