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

Abstract

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++??+Ds1(2460)+, ?+Ds0?(2317)+, and P-wave ZV++??+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 ?full=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. © 2021 The Author(s)