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Barbat, M. F., Nieves, J., & Tolos, L. (2026). Scattering and femtoscopic correlation functions of the Σ++cπ+,Σ0cπ- and Σ+bπ+ systems. Phys. Lett. B, 878, 140529–10pp.
Abstract: We present predictions for scattering observables and femtoscopic correlation functions (CFs) of the I=2 Sigma(++)(c)(pi+) , Sigma(0)(c)pi systems and its heavy-flavor counterpart . In both heavy-quark sectors, the strong interaction is formulated within two distinct theoretical frameworks, each constrained to reproduce the lowest-lying odd-parity isoscalar spin-1/2 resonances, Lambda(c)(2595) and Lambda(b)(5912), respectively. While the Sigma(0)(c)pi (_)pair is governed solely by the strong interaction, electrostatic contributions are included in the other two channels involving charged particles through relativistic Coulomb wave functions. We show that the differences observed in the scattering observables between the two strong-interaction models arise mainly from the specific ultraviolet regularization schemes employed. The inclusion of Coulomb effects induces only a very small increase in both the scattering length and the effective range. The resulting CFs in the charm and bottom sectors display analogous global features, in agreement with expectations from heavy-quark flavor symmetry. Both, the Sigma(++)(c)pi(+) and Sigma(+)(b)pi(+) CFs, when computed including only the strong interaction, exhibits substantial discriminating power among the different models. However, once Coulomb effects are incorporated, the CFs become largely affected by the repulsive electrostatic interaction, which diminishes their sensitivity to the details of the underlying strong dynamics, thereby reducing the capability to differentiate between theoretical descriptions. Thus, the Sigma(0)(c)pi CF-being free from Coulomb effects-provides the most suitable observable for constraining the strong dynamics of the isotensor Sigma(c)pi system.
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Encarnación, P., García-Lorenzo, A., Albaladejo, M., Feijoo, A., Nieves, J., & Vidaña, I. (2026). Coulomb effects in momentum-space femtoscopy: A case study of the K-Ω system. Phys. Lett. B, 882, 141041–11pp.
Abstract: We present a momentum-space framework for the consistent treatment of Coulomb interactions in femtoscopic correlation functions based on a modified Vincent-Phatak method that is more amenable to numerical implementation. The formalism provides a practical approach to incorporating Coulomb effects at the short distances relevant for femtoscopy within the Lippmann-Schwinger equation, while preserving a unified treatment of the strong interaction. As an application, we study the S = -4 pseudoscalar-baryon decuplet interaction in the K52 system and present predictions for the singly and doubly negatively charged channels, K052-and K-52-. As an additional validation of the formalism, we have also applied it to the well-studied pp system. We further assess the limitations of the asymptotic wave-function approximation and quantify corrections accounting for the short-distance structure of the interaction potential. We introduce a phenomenological parameter that effectively absorbs contributions from both the finite source size and the off-shell structure of the interaction, the latter being one of the main obstacles to extracting detailed information on hadron-hadron interactions from femtoscopic measurements in a model-independent way.
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Vidaña, I., Feijoo, A., Albaladejo, M., Nieves, J., & Oset, E. (2023). Femtoscopic correlation function for the Tcc(3875)+ state. Phys. Lett. B, 846, 138201–9pp.
Abstract: We have conducted a study of the femtoscopic correlation functions for the D0D*+ and D+D*0 channels that build the Tcc state. We develop a formalism that allows us to factorize the scattering amplitudes outside the integrals in the formulas, and the integrals involve the range of the strong interaction explicitly. For a source of size of 1 fm, we find values for the correlation functions of the D0D*+ and D+D*0 channels at the origin around 30 and 2.5, respectively, and we see these observables converging to unity already for relative momenta of the order of 200 MeV. We conduct tests to see the relevance of the different contributions to the correlation function and find that it mostly provides information on the scattering length, but should the correlation functions be measured with the precision of the latest experiments, the effective range of the D0D*+ could also be obtained.
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