New scalar resonance X-0(2900) as a (D)over-bar*K* molecule: mass and width

Agaev S. S., Azizi K., Sundu H.

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, vol.48, no.8, 2021 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 48 Issue: 8
  • Publication Date: 2021
  • Doi Number: 10.1088/1361-6471/ac0b31
  • Journal Name: JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, INSPEC, DIALNET
  • Kocaeli University Affiliated: Yes

Abstract

We explore features of the scalar structure X-0(2900), which is one of the two resonances discovered recently by LHCb in the D- K+ invariant mass distribution in the decay B+ -> D+ D- K+. We treat X-0(2900) as a hadronic molecule composed of the conventional mesons (D) over bar*(0) K*(0) and calculate its mass, coupling and width. The mass and coupling of X-0(2900) are determined using the QCD two-point sum rule method by taking into account quark, gluon, and mixing vacuum condensates up to dimension 15. The decay of this structure to final state D- K+ is investigated in the context of the light-cone sum rule approach supported by a soft-meson technique. To this end, we evaluate strong coupling G corresponding to vertex X0D- K+, which allows us to find width of the decay X-0(2900) -> D- K+. Obtained predictions for the mass of the hadronic molecule (D) over bar*K-0*(0) m = (2868 +/- 198) MeV and for its width Gamma = (49.6 +/- 9.3) MeV can be considered as arguments in favor of molecule interpretation of X-0(2900).