
Bayar, M., Xiao, C. W., Hyodo, T., Dote, A., Oka, M., & Oset, E. (2012). Energy and width of a narrow I=1/2 DNN quasibound state. Phys. Rev. C, 86(4), 044004–16pp.
Abstract: The energies and widths of DNN quasibound states with isospin I = 1/2 are evaluated in two methods, the fixed center approximation to the Faddeev equation and the variational method approach to the effective onechannel Hamiltonian. The DN interactions are constructed so they dynamically generate the Lambda(c)(2595) (I = 0, J(pi) = 1/2()) resonance state. We find that the system is bound by about 250 MeV from the DNN threshold, root s similar to 3500 MeV. Its width, including both the mesonic decay and the D absorption, is estimated to be about 2040 MeV. The I = 0 DN pair in the DNN system is found to form a cluster that is similar to the Lambda(c)(2595).



Dote, A., Bayar, M., Xiao, C. W., Hyodo, T., Oka, M., & Oset, E. (2013). A narrow quasibound state of the DNN system. Nucl. Phys. A, 914, 499–504.
Abstract: We have investigated a charmed system of DNN (composed of two nucleons and a D meson) by a complementary study with a variational calculation and a Faddeev calculation with fixedcenter approximation (FaddeevFCA). In the present study, we employ a DN potential based on a vectormeson exchange picture in which a resonant A(c)(2595) is dynamically generated as a DN quasibound state, similarly to the A(1405) as a (K) over barN one in the strange sector. As a result of the study of variational calculation with an effective DN potential and three kinds of NN potentials, the DNN(J(pi) =0(), I = 1/2) is found to be a narrow quasibound state below A(c)(2595)N threshold: total binding energy similar to 225 MeV and mesonic decay width similar to 25 MeV. On the other hand, the J(pi) =1() state is considered to be a scattering state of A(c)(2595) and a nucleon. These results are essentially supported by the FaddeevFCA calculation. By the analysis of the variational wave function, we have found a unique structure in the DNN(J(pi) = 0, I = 1/2) such that the D meson stays around the center of the total system due to the heaviness of the D meson.



Kamiya, Y., Miyahara, K., Ohnishi, S., Ikeda, Y., Hyodo, T., Oset, E., et al. (2016). Antikaonnucleon interaction and Lambda(1405) in chiral SU(3) dynamics. Nucl. Phys. A, 954, 41–57.
Abstract: The properties of the Lambda(1405) resonance are key ingredients for determining the antikaonnucleon interaction in strangeness nuclear physics, and the novel internal structure of the Lambda(1405) is of great interest in hadron physics, as a prototype case of a baryon that does not fit into the simple threequark picture. We show that a quantitative description of the antikaonnucleon interaction with the Lambda(1405) is achieved in the framework of chiral SU(3) dynamics, with the help of recent experimental progress. Further constraints on the (K) over barN subthreshold interaction are provided by analyzing pi Sigma spectra in various processes, such as the K()d > pi Sigma n reaction and the Lambda(c) > pi pi Sigma decay. The structure of the Lambda(1405) is found to be dominated by an antikaonnucleon molecular configuration, based on its wavefunction derived from a realistic (K) over barN potential and the compositeness criteria from a modelindependent weakbinding relation.



Mantovani Sarti, V., Feijoo, A., Vidana, I., Ramos, A., Giacosa, F., Hyodo, T., et al. (2024). Constraining the lowenergy S =2 mesonbaryon interaction with twoparticle correlations. Phys. Rev. D, 110(1), L011505–8pp.
Abstract: In this paper we present a novel method to extract information on hadronhadron interactions using for the first time femtoscopic data to constrain the lowenergy constants of a QCD effective Lagrangian. This method offers a new way to investigate the nonperturbative regime of QCD in sectors where scattering experiments are not feasible, such as the multistrange and charm ones. As an example of its application, we use the very precise KLambda correlation function data, recently measured in pp collisions at LHC, to constrain the strangeness S = 2 mesonbaryon interaction. The model obtained delivers new insights on the molecular nature of the Xi(1620) and Xi(1690) states.



Miyahara, K., Hyodo, T., Oka, M., Nieves, J., & Oset, E. (2017). Theoretical study of the Xi(1620) and Xi(1690) resonances in Xi(c)> pi(+) MB decays. Phys. Rev. C, 95(3), 035212–12pp.
Abstract: Nonleptonic weak decays of Xi(c) into pi(+) and a meson (M)baryon (B) final state, MB, are analyzed from the viewpoint of probing S = 2 baryon resonances, i.e., Xi(1620) and Xi(1690), of which spinparity and other properties are not well known. We argue that the weak decay of Xi(c) is dominated by a single quarkline diagram, preferred by the CabibboKobayashiMaskawa coefficient, color recombination factor, the diquark correlation, and the kinematical condition. The decay process has an advantage of being free from meson resonances in the p+ M invariantmass distribution. The invariant mass distribution of the mesonbaryon final state is calculated with three different chiral unitary approaches, assuming that the Xi(1620) and Xi(1690) resonances have J(P) = 1/2(). It is found that a clear peak for the Xi(1690) is seen in the pi Xi and K Lambda spectra. We also suggest that the ratios of the pi Xi, K Lambda, and K Sigma final states are useful to distinguish whether the peak is originated from the Xi(1690) resonance or it is a K Sigma threshold effect.



Miyahara, K., Hyodo, T., & Oset, E. (2015). Weak decay of Lambda(+)(c) for the study of Lambda(1405) and Lambda(1670). Phys. Rev. C, 92(5), 055204–8pp.
Abstract: We study the Lambda(c) decay process to pi(+) and the mesonbaryon final state for the analysis of Lambda resonances. Considering the CabibboKobayashiMaskawamatrix, color suppression, diquark correlation, and the kinematical condition, we show that the final mesonbaryon state should be in a pure I = 0 combination, when the mesonbaryon invariantmass is small. Because the I = 1 contamination usually makes it difficult to analyze Lambda resonances directly from experiments, the Lambda(c) decay is an ideal process to study Lambda resonances. Calculating the finalstate interaction by chiral unitary approaches, we find that the pi Sigma invariant mass distributions have the same peak structure in the all charge combination of the pi Sigma states related to the higher pole of the two poles of the Lambda(1405). Furthermore, we obtain a clear Lambda(1670) peak structure in the (K) over bar N and eta Lambda spectra.



Oset, E., Bayar, M., Dote, A., Hyodo, T., Khemchandani, K. P., Liang, W. H., et al. (2016). Two, Three, Manybody Systems Involving Mesons. Multimeson Condensates. Acta Phys. Pol. B, 47(2), 357–365.
Abstract: In this paper, we review results from studies with unconventional manyhadron systems containing mesons: systems with two mesons and one baryon, three mesons, some novel systems with two baryons and one meson, and finally, systems with many vector mesons, up to six, with their spins aligned forming states of increasing spin. We show that in many cases, one has experimental counterparts for the states found, while in some other cases, they remain as predictions, which we suggest to be searched in BESIII, Belle, LHCb, FAIR and other facilities.

