Doubly charged vector tetraquark ZV++=[cu][s‾d‾]

We explore properties of the doubly charged vector tetraquark ZV++=[cu][s‾d‾] built of four quarks of different flavors using the QCD sum rule methods. The mass and current coupling of ZV++ are computed in the framework of the QCD two-point sum rule approach by taking into account quark, gluon and mixed vacuum condensates up to dimension 10. The full width of this tetraquark is saturated by S-wave ZV++→π+Ds1(2460)+, ρ+Ds0⁎(2317)+, and P-wave ZV++→π+Ds+,K+D+ decays. Strong couplings required to find partial widths of aforementioned decays are calculated in the context of the QCD light-cone sum rule method and a soft-meson approximation. Our predictions for the mass m=(3515±125) MeV and full width Γfull=156−30+56 MeV of ZV++ are useful to search for this exotic meson in various processes. Recently, the LHCb collaboration discovered neutral states X0(1)(2900) as resonance-like peaks in D−K+ invariant mass distribution in the decay B+→D+D−K+. We argue that mass distribution of D+K+ mesons in the same B decay can be used to observe the doubly charged scalar ZS++ and vector ZV++ tetraquarks.

Abstract licence: CC BY

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