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Lin, J. X., Encarnacion, P., Albaladejo, M., & Feijoo, A. (2026). Signatures of odd-parity s-wave Ξ∗ states in femtoscopic correlation functions. Phys. Lett. B, 875, 140305–12pp.
Abstract: We investigate the Xi & lowast;resonances within the molecular picture, where these states are dynamically generated as poles in the unitarized scattering amplitudes arising from the coupled-channel interactions of K & lowast;-Lambda, K & lowast;-Sigma 0, rho-Xi 0, K & lowast;0 Sigma-, rho 0 Xi-, omega Xi-,and phi Xi-. The interaction kernel is derived from the local hidden gauge formalism, while the unitarization procedure employs a hybrid method that combines cutoff and dimensional regularizations in the evaluation of the loop function. From a detailed spectroscopic analysis, we identify two S = -2 baryon states whose properties are compatible with some of the Xi & lowast;resonances listed in the Review of Particle Physics. To explore their possible experimental signatures, we compute the femtoscopic correlation functions for all the vector-baryon pairs considered in the present study, using realistic estimates of production weights and varying source sizes R = 1, 1.1, 1.2, 1.3, 1.5 fm .
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Lin, J. X., Encarnacion, P., Feijoo, A., & Albaladejo, M. (2026). Signatures of the Ω(2012)- state in Ξ*(K)over-bar correlation functions. Phys. Lett. B, 880, 140789–9pp.
Abstract: We investigate the Omega(2012) resonance in the strangeness S = -3 sector within a coupled-channel chiral unitary approach and present the first quantitative predictions for femtoscopic correlation functions directly sensitive to its dynamics. The Omega(2012) is dynamically generated as a quasi-bound Xi*(K) over bar-Omega eta 2 molecular state, with its coupling to the Xi(K) over bar channel driven by d-wave transitions. Model parameters are constrained by the measured mass, width, and the Belle determination of the branching fraction R-Xi K(Xi(K) over bar pi), yielding M (Omega(2012)) = (2012.53 +/- 0.73) MeV and Gamma(Omega(2012)) = (4.05 +/- 0.13) MeV.Within this framework, we compute the femtoscopic correlation functions of the Xi K-*0(-), Xi*(-)(K) over bar (0) and Omega(-) eta systems. The Xi*(K) over bar correlation functions exhibit pronounced near-threshold structures that arise from the proximity of the Omega(2012) pole, demonstrating an exceptional sensitivity to its position and coupled-channel composition. In particular, the Xi*K-0(-) correlation function is identified as a clean and highly selective probe of the Omega(2012) resonance. These results establish femtoscopic correlation measurements as powerful tools for extracting resonance properties beyond conventional invariant-mass analyses and provide concrete theoretical benchmarks for upcoming experimental studies aimed at elucidating the molecular nature of the Omega(2012).
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Oset, E., Chen, H. X., Feijoo, A., Geng, L. S., Liang, W. H., Li, D. M., et al. (2016). Study of reactions disclosing hidden charm pentaquarks with or without strangeness. Nucl. Phys. A, 954, 371–392.
Abstract: We present results for five reactions, Lambda(b) -> J/psi K(-)p, Lambda(b) -> J/psi eta Lambda, Lambda(b) -> J/psi pi(-)p, Lambda(b) -> J/psi K-0 Lambda and Xi(-)(b) -> J/psi K-Lambda, where combining information from the meson baryon interaction, using the chiral unitary approach, and predictions made for molecular states of hidden charm, with or without strangeness, we can evaluate invariant mass distributions for the light meson baryon states, and for those of J/psi p or J/psi Lambda. We show that with the present available information, in all of these reactions one finds peaks where the pentaquark states show up. In the Lambda(b) -> J/psi K(-)p, and Lambda(b) -> J/psi pi(-)p reactions we show that the results obtained from our study are compatible with present experimental observations.
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