Feijoo, A., Mantovani Sarti, V., Nieves, J., Ramos, A., & Vidaña, I. (2025). Bridging correlation and spectroscopy measurements to access the hadron interaction behind molecular states: The case of the Ξ(1620) and Ξ(1690) in the K – Λ system. Phys. Rev. D, 111(1), 014022–15pp.
Abstract: We study the compatibility between the K-A correlation function, recently measured by the ALICE collaboration, and the LHCb K-A invariant mass distribution obtained in the -b -> J/psi AK- decay. The K-A invariant mass distribution associated with the – b decay has been calculated within the framework of unitary effective field theories using two models, one of them constrained by the K-A correlation function. We consider two degenerate pentaquark PAs states in the J/psi A scattering amplitude which allows us to investigate their impact on both the K-A and J/psi A mass distributions assuming different spin-parity quantum numbers and multiplicity. Without any fitting procedure, the K-A model is able to better reproduce the experimental K-A mass spectrum in the energy region above 1680 MeV as compared to previous unitarized scattering amplitudes constrained to a large amount of experimental data in the neutral S = -1 meson-baryon sector. We observe a tension between our model and the LHCb K-A distribution in the region close to threshold, largely dominated by the presence of the still poorly known (1620) state. We discuss in detail the different production mechanisms probed via femtoscopy and spectroscopy that could provide valid explanations for such disagreement, indicating the necessity to employ future correlation data in other S = -2 channels such as pi and K<overline>Sigma.
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Song, J., Yang, Z. Y., & Oset, E. (2025). Searching for the 2+partner of the Tcs0(2870) in the B- -> D- D0 K0S reaction. Phys. Rev. D, 111(9), 094004–7pp.
Abstract: We study the B- -> D- D0 K0S reaction, recently analyzed by the LHCb Collaboration, where a clear signal for the exotic Tcs0(2870) state was reported. We call attention to a small peak in the D0K0S mass distribution that could correspond to a state of the same nature as the Tcs0(2870) (D*K<overline>* nature in the molecular picture), but with JP = 2+. In order to magnify the signal for the state, we calculate the moments of the angle-mass distribution, which are linear in the resonance signal, rather than quadratic for the angle integrated mass distribution. We find spectra for the moments with a strength far bigger than that for the angle integrated mass distribution, which should encourage the evaluation of these moments from the present measurements of the reaction.
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Lyu, W. T., Duan, M. Y., Xiao, C. W., Wang, E., & Oset, E. (2024). Possible signal of an exotic I=1, J=2 state in the B → D*- D+ K+ reaction. Eur. Phys. J. C, 84(12), 1302–6pp.
Abstract: We study the B+ -> D*(-) D+ K+ reaction, showing that a peak in the D+ K+ mass distribution around 2834 MeV reported by LHCb could be associated with a theoretical exotic state with that mass, a width of 19 MeV and J(P) = 2(+), stemming from the interaction of the D*K+*(+) and D-s*(+) rho(+) channels, which is a partner of the 0(+) T-c (s) over bar (2900). We show that the data is compatible with this assumption, but also see that the mass distribution itself cannot discriminate between the spins J = 0, 1, 2 of the state. Then we evaluate the momenta of the angular mass distribution and show that they are very different for each of the spin assumptions, and that the momenta coming from interference terms have larger strength at the resonant energy than the peaks seen in the angular integrated mass distribution. We make a call for the experimental determination of these magnitudes, which has already been used by the LHCb in related decay reactions.
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Figueroa, D. G., Lizarraga, J., Loayza, N., Urio, A., & Urrestilla, J. (2025). Nonlinear dynamics of axion inflation: A detailed lattice study. Phys. Rev. D, 111(6), 063545–40pp.
Abstract: We study in detail the fully inhomogeneous nonlinear dynamics of axion inflation, identifying three regimes: weak, mild, and strong backreaction, depending on the duration of inflation. We use lattice techniques that explicitly preserve gauge invariance and shift symmetry, and which we validate against other computational methods of the linear dynamics and of the homogeneous backreaction regime. Notably, we demonstrate that the latter fails to accurately describe the truly local dynamics of strong backreaction. We investigate the convergence of simulations of local backreaction, determining the requirements to achieve an accurate description of the dynamics, and providing useful parametrizations of the delay of the end of inflation. Additionally, we identify key features emerging from a proper local treatment of strong backreaction: the dominance of magnetic energy against the electric counterpart, the excitation of the longitudinal mode, and the generation of a scale-dependent chiral (im)balance. Our results underscore the necessity to accurately capture the local nature of the nonlinear dynamics of the system, in order to correctly assess phenomenological predictions, such as, e.g., the production of gravitational waves and primordial black holes.
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Duan, M. Y., Lyu, W. T., Xiao, C. W., Wang, E., Xie, J. J., Chen, D. Y., et al. (2025). Λc+ → ηπ+ Λ reaction and the Λa0+(980) and π+Λ(1670) contributions. Phys. Rev. D, 111(1), 016004–10pp.
Abstract: We study from the theoretical point of view the Lambda(+)(c) ->pi(+) eta Lambda reaction, recently measured by the Belle and BESIII Collaborations, where clear signals are observed for a(0)(980), Lambda(1670), and Sigma(1385) excitation. By considering the a(0)(980) and Lambda(1670) as dynamically generated resonances from the meson meson and meson baryon interaction, respectively, we are able to determine their relative production strengths in the reaction, which is also tied to the strength of the pi(+) eta Lambda tree level contribution. We observe that this latter strength is very big and there are large destructive interferences between the tree level and the rescattering terms where the a(0)(980) and Lambda(1670) are generated. The Sigma(1385) contribution is included by means of a free parameter, the only one of the theory, up to a global normalization, when one considers only external emission, and we observe that the spin flip part of this term, usually ignored in theoretical and experimental works, plays an important role determining the shape of the mass distributions. Internal emission is also considered and it is found to a minor role.
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Montesinos, V., Song, J., Liang, W. H., Oset, E., Nieves, J., & Albaladejo, M. (2024). Study of possible DND* bound states. Phys. Rev. D, 110(5), 054043–11pp.
Abstract: We start from a recently favored picture in which the Ac(2940) and Lambda(c)(2910) correspond mostly to ND* bound states with J(P) = 1=2(-); 3=2(-) respectively, and then add a D as a third particle, looking for the possible binding of the DND* three-body system within the framework of the fixed center approximation. We find that the system is bound with respect to the corresponding Lambda(c)(2940)D, Lambda(c)(2910)D thresholds with a binding of about 60 MeV and a width of about 90 MeV. Alternatively we assume a cluster of ND and a D* meson interacting with the cluster, and we find similar results. The observation of these states of J(P) = 1=2(+); 3=2(+) would provide new and valuable information concerning the DN and D*N interaction, an issue of current debate.
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Albaladejo, M., Canoa, A., Nieves, J., Pelaez, J. R., Ruiz Arriola, E., & Ruiz de Elvira, J. (2025). The role of chiral symmetry and the non-ordinary κ/K*0(700) nature in π±KS femtoscopic correlations. Phys. Lett. B, 866, 139552–5pp.
Abstract: We show that the use of realistic pi K interactions, obtained from a dispersive analysis of scattering data, as well as relativistic corrections, are essential to describe recently observed pi +/- KS femtoscopic correlations. We demonstrate that the spontaneous chiral symmetry breaking dynamics and the non-ordinary features of the kappa/K0*(700)resonance, together with large cancellations between isospin channels, produce a large suppression of pi +/- KS femtoscopic correlations compared to widely used models. Within an improved version of the standard on-shell factorization formalism, we illustrate that compensating for this interaction suppression leads to source radii smaller than 1 fm, contrary to usual expectations, as well as larger correlation strengths. The relation between these two parameters cannot be accommodated within naive models describing the nature of the resonances. This may raise concerns about the applicability of popular but too simple approaches for systems with light mesons. However, the correlation-suppression effects we demonstrate here will be relevant in any formalism, and substantial corrections may be expected for other femtoscopic systems involving light mesons.
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Magalhaes, R. B., Ribeiro, G. P., Lima, H. C. D. J., Olmo, G. J., & Crispino, L. C. B. (2024). Singular space-times with bounded algebraic curvature scalars. J. Cosmol. Astropart. Phys., 05(5), 114–34pp.
Abstract: We show that the absence of unbounded algebraic curvature invariants constructed from polynomials of the Riemann tensor cannot guarantee the absence of strong singularities. As a consequence, it is not sufficient to rely solely on the analysis of such scalars to assess the regularity of a given space-time. This conclusion follows from the analysis of incomplete geodesics within the internal region of asymmetric wormholes supported by scalar matter which arise in two distinct metric-affine gravity theories. These wormholes have bounded algebraic curvature scalars everywhere, which highlights that their finiteness does not prevent the emergence of pathologies (singularities) in the geodesic structure of space-time. By analyzing the tidal forces in the internal wormhole region, we find that the angular components are unbounded along incomplete radial time-like geodesics. The strength of the singularity is determined by the evolution of Jacobi fields along such geodesics, finding that it is of strong type, as volume elements are torn apart as the singularity is approached. Lastly, and for completeness, we consider the wormhole of the quadratic Palatini theory and present an analysis of the tidal forces in the entire space-time.
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Centrone, F., & Gessner, M. (2024). Breaking local quantum speed limits with steering. Phys. Rev. Res., 6(4), L042067–5pp.
Abstract: We show how quantum correlations allow us to break the local speed limits of physical processes using only local measurements and classical communication between two parties that share an entangled state. Inequalities that bound the minimal time of evolution of a quantum state by energy fluctuations can be violated in the presence of steering by conditioning on the measurement outcomes of a remote system. Our results open up pathways for studying how quantum correlations influence the dynamical properties of states and observables.
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Bruschini, R., Gonzalez, P., & Tarutina, T. (2025). 3P0 model revisited. Phys. Rev. D, 111(7), 074042–8pp.
Abstract: We revisit the phenomenological 3P0 model for the decay of quarkonium (QQ<overline>) into two open flavor mesons ( 1R<overline>1R). We take the heavy-quark limit and derive a transition rate between Q Q<overline> and 1R<overline>1R to be compared with the one calculated in studies of string breaking using lattice QCD. This comparison allows us to fit the creation amplitude of a light quark-antiquark pair in the 3P0 model to the string-breaking transition rate in QCD.
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