| Resonant formation of Lambda(1405) by stopped-K- absorption in d (2009) | |||||||||
Abstract | |||||||||
| We show that the current debate on the position of the quasi-bound K-p state, namely, "Lambda(1405) or Lambda*(1420)", can be solved by measuring experimental observables that involve the transition matrix element T_{21} = T_{Sigma-pi leftarrow bar{K}N}. As one of such ways, we propose to observe the Sigma-pi invariant-mass spectrum in stopped-K- absorption in deuterons, since the spectrum, reflecting the deuteron momentum distribution, is expected to have a narrow direct-capture 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) is revealed as an isolated peak.. Comment: 6 pages, 6 figures | |||||||||
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