|
|
Ikeno, N., & Oset, E. (2026). Λ(1670) production in the ψ(3686) → Λ(Λ)over-barη reaction. Phys. Lett. B, 880, 140825–6pp.
Abstract: We perform a calculation of the invariant mass distributions in the psi(3686) -> Lambda(Lambda) over bar eta reaction, where a neat peak for the excitation of the Lambda(1670) and (Lambda) over bar (1670) in the eta A and eta(Lambda) over bar mass distributions, respectively, is observed. Our approach uses the fact that the psi(3686), a c (c) over bar state, is a singlet of SU(3) in the u, d, s quarks and constructs the two flavor structures allowed with a pseudoscalar meson, a baryon and an antibaryon. The resonance peaks come from the final state interaction of meson baryon pairs, which generate the A(1670) in our approach. With a reasonable relative weight of the two flavor structures, the only free parameter of the theory, we are able to get the three mass distributions in good agreement with experiment, giving extra support to the molecular structure of the Lambda(1670) resonance. The agreement with data improves with an extra resonant contribution with mass around 2200 MeV, possibly accounting for some resonances.
|
|
|
|
Liu, S. W., Lyu, W. T., & Xie, J. J. (2026). Probing the hadronic molecular nature of the Ω(2012), Ω(2380), and Ωc(3120) via femtoscopy correlation functions. Phys. Lett. B, 882, 140979–9pp.
Abstract: We investigate the femtoscopic correlation functions of systems associated with the Omega(2012), Omega(2380), and Omega(c)(3120) resonances, with the aim of elucidating their internal structures. By employing effective potential models that incorporate both s-wave and d-wave interactions, we calculate the correlation functions for the relevant coupled channels. Our numerical results reveal pronounced enhancement structures in the Xi(0) K- and Xi(+)(c) K- correlation functions, which provide direct evidences for the dynamically generated Omega(2012) and Omega(c)(3120) states. Furthermore, significant low-momentum enhancements are observed in the Xi*0K(-) and Xi*K-0*(-) channel, which are attributed to the Omega(2012) and Omega(2380) resonances. These theoretical calculations provide crucial insights for future high-precision measurements at the LHC and RHIC, offering a novel and independent approach to determine the dynamically generated hadronic molecular nature of these Omega excited states.
|
|
