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- W2738993805 abstract "In the last decade there have been increased theoretical and experimental evidences about the existence of two poles associated to the Λ(1405). In this contribution we summarize several recent works presenting a successful strategy to extract the position of the two Λ(1405) poles from experimental photoproduction data on the γp → KπΣ reaction at Jefferson Lab. The idea is based on considering a production mechanism as model independent as possible and implementing the final state interaction of the final meson-baryon pair based on small modifications of the unitary chiral perturbation theory amplitudes. Precise values for the two poles of the Λ(1405) resonance are then provided. On the other hand, we also present other work where we analyze theoretically the Λ_b → J/ψK^−p reaction from where a recent LHCb experiment extracts a Λ(1405) contribution in the K^−p spectrum close to threshold and two baryon states of hidden charm in the J/ψ p spectrum, claimed to be pentaquarks. By assuming that the observed narrow state around 4450 MeV has a nature stemming mostly from (mathop {bar{D}}nolimits^{*}Sigma _{c}) and (mathop {bar{D}}nolimits^{*}Sigma _{c}^{*}) coupled channel dynamics with = 3/2^−, we are able to describe simultaneously the shapes and relative strength of the K^−p mass distribution close to threshold and the peak of the J/ψ p distribution." @default.
- W2738993805 created "2017-07-31" @default.
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- W2738993805 date "2017-07-18" @default.
- W2738993805 modified "2023-09-27" @default.
- W2738993805 title "On the Double Pole Structure of the Λ(1405)" @default.
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- W2738993805 doi "https://doi.org/10.7566/jpscp.17.071002" @default.
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