6533b831fe1ef96bd129898c

RESEARCH PRODUCT

Predictions for the Λb→J/ψΛ(1405) decay

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description

We calculate the shape of the πΣ and K¯N invariant mass distributions in the Λb→J/ψπΣ and Λb→J/ψK¯N decays that are dominated by the Λ(1405) resonance. The weak interaction part is the same for both processes and the hadronization into the different meson–baryon channels in the final state is given by symmetry arguments. The most important feature is the implementation of the meson–baryon final-state interaction using two chiral unitary models from different theoretical groups. Both approaches give a good description of antikaon–nucleon scattering data, the complex energy shift in kaonic hydrogen and the line shapes of πΣK in photoproduction, based on the two-pole scenario for the Λ(1405) . We find that this reaction reflects more the higher mass pole and we make predictions of the line shapes and relative strength of the meson–baryon distributions in the final state.