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The two-pole nature of the Lambda(1405) from lattice QCD

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If you have a question about this talk, please contact Terry Generet .

Although experimentally well-established, the nature of the Lambda(1405) hyperon resonance has long been a mystery. Constituent quark models have difficulty accommodating its low mass, while approaches based on chiral effective theory typically predict an additional state, the Lambda(1380), which is broad and difficult to identify. I will present the first lattice QCD computation of the coupled-channel πÎĢ − KĖ…N scattering amplitude in the Lambda(1405) channel, which employs quark masses so that the πÎĢ threshold is approximately 1380 MeV. This enables the unambiguous identification of the Lambda(1380) in addition to the Lambda(1405), thus supporting the exotic meson-baryon `molecule’ interpretation.

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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