Study of Resonances of theΣ−πSystem

Abstract

observed with a mass of 1385 Mev. Two types of resonances have been predicted that might relate this observation to other elementary-particle interactionll: (1) P 3/2 resonances in the A:rr and Z." systems predicted. 7 8 FOOTNOTES UCRlo-9675

BasicK¯nuclear cluster,K−pp, and its enhanced formation in theYamazaki1, Akaishi2 2007Phys. Rev. C214253085View full textAdd to dashboardCite

“…Through the main part of this paper we employ the "classical" experimental values for the binding energy and width [8,9],…”

“…The basic ingredient for this new family of nuclear states is the I = 0 K − p state, which is identified to the known Λ(1405) resonance (hereafter, expressed as Λ * ) in the Σπ channel with a binding energy of B K = 27 MeV and a width of Γ = 40 MeV [8]. Since the Λ(1405) resonance is largely populated in the p+K − → Λ * +(ππ) 0 channel [9]. it is very likely to be the I = 0KN state.…”

Measurement of theΣπphotoproduction line shapes near theΛ(1405)

“…First seen in bubble chamber experiments in the 1960's [1], there have been remarkably few measurements of this state to date. The most prominent feature of the state is that its invariant mass spectrum, which we call the "line shape", has always been seen to be distorted from a Breit-Wigner form, indicating that there are strong dynamics at work that are not seen in more typical resonances.…”

Studying the bound state of the K−p system in the Bethe-Salpeter formalism

“…In the light baryon spectrum, one of such resonances is Λ(1405), which is just below theKN threshold and emerges in the meson-baryon scattering amplitude with I(J P ) = 0(1/2 − ) and strangeness S = −1 [1,3]. It was discovered in the Σπ invariant mass spectrum of the channel K − p → πππΣ [4][5][6]. Various experimental and theoretical investigations for Λ(1405) have been preformed in recent years.…”