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Resonance parameters (pole masses and residues) associated with the excitedstates of hyperons, Lambda^* and Sigma^*, are extracted within a dynamicalcoupled-channels model developed recently by us [Phys. Rev. C 90, 065204(2014)] through a comprehensive partial-wave analysis of the K^- p --> barK N,pi Sigma, pi Lambda, eta Lambda, K Xi data up to invariant mass W = 2.1 GeV. Weconfirm the existence of resonances corresponding to most, if not all, of thefour-star resonances rated by the Particle Data Group. We also find several newresonances, and in particular propose a possible existence of a new narrowJ^P=3/2^+ Lambda resonance that couples strongly to the eta Lambda channel. TheJ^P=1/2^- Lambda resonances located below the barK N threshold are alsodiscussed. Comparing our extracted pole masses with the ones from a recentanalysis by the Kent State University group, some significant differences inthe extracted resonance parameters are found, suggesting the need of moreextensive and accurate data of K^- p reactions including polarizationobservables to eliminate such an analysis dependence of the resonanceparameters. In addition, the determined large branching ratios of the decays ofhigh-mass resonances to the pi Sigma^* and barK^* N channels also suggest theimportance of the data of 2 --> 3 reactions such as K^- p --> pi pi Lambda andK^- p --> pi barK N. Experiments on measuring cross sections and polarizationobservables of these fundamental reactions are highly desirable at hadron beamfacilities such as J-PARC for establishing the Lambda^* and Sigma^* spectrum.

Dynamical coupled-channels model of $K^- p$ reactions (II): Extraction of $\Lambda^*$ and $\Sigma^*$ hyperon resonances

Dynamical coupled-channels model of $K^- p$ reactions (II): Extraction of $\Lambda^$ and $\Sigma^$ hyperon resonances