Research Information System
Journal of Physics G: Nuclear and Particle Physics, vol.50, no.5, 2023 (SCI-Expanded, Scopus)
We investigate properties of the new scalar resonances T cs 0 a ( 2900 ) ++ and T cs 0 a ( 2900 ) 0 , which were recently reported by the LHCb collaboration. These states were observed as resonant structures in D s + π + and D s + π − invariant mass distributions in B + meson decays. We argue that T cs 0 a ( 2900 ) ++ and T cs 0 a ( 2900 ) 0 may be modeled as molecules ++ = D s ∗ + ρ + and 0 = D s ∗ + ρ − of conventional vector mesons, respectively. The mass m and current coupling f of the molecule ++ are calculated using a two-point sum rule method. The sum rule analysis is performed by taking into account vacuum condensates up to dimension 8. The obtained result for the mass, m = (2917 ± 135) MeV, permits us to consider the molecule ++ as one of the possible models of the resonance T cs 0 a ( 2900 ) ++ . Because the second structure T cs 0 a ( 2900 ) 0 is isospin partner of the doubly charged state, it should have a mass close to m.