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

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

2009-09-14

arxiv.org/abs/0909.2573v5

Phys.Rev.C83:055207,2011

Physics

Nuclear Physics

Nuclear Theory

7 pages, 6 figures

Scientific paper

10.1103/PhysRevC.83.055207

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.

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