“School of Particles”
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| Paper IPM / Particles / 16319 |
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We explore features of the scalar structure X0(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 X0(2900)
as a hadronic molecule composed of the conventional mesons ―D*0 and K*0 and calculate its mass, coupling and width. The mass and coupling of X0(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 X0(2900) → D−K+. Obtained predictions for the mass of the hadronic molecule ―D* K* m=(2868 ±198) MeV and for its width Γ = (49.6 ±9.3) MeV can be considered as arguments in favor of molecule interpretation of X0(2900).
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