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We study the mechanism of the weak decay process of Xi_b^0 into D^0 with ameson-baryon pair. It is shown that the dominant component of the prompt weakdecay produces the meson-baryon pair with the spectator strange quark beingtransferred to the baryon, so that the Kbar N channel is absent. Subsequentfinal state interaction then reflects the pi Sigma originated Lambda(1405)formation amplitude, which has been difficult to access in previousexperimental studies. We predict the line shapes of the pi Sigma invariant massdistribution using a realistic chiral meson-baryon amplitude for the finalstate interaction. It is shown that the interference between the direct and therescattering contributions can strongly distort the peak structure of theLambda(1405) in the mass distribution. This indicates the necessity of adetailed investigation of the reaction mechanism in order to extract theLambda(1405) property in the pi Sigma mass distribution.

Theoretical study of the Lambda(1405) resonance in Xi_b^0 -> D^0 pi Sigma decay