Doubly charged vector tetraquark Z++ V = [cu][sd]

We explore properties of the doubly charged vector tetraquark ZV++= [cu][sd] 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 Z++ V -> pi+Ds1(2460)+, rho+D*s0(2317)+, and P-wave Z++ V -> pi+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 Pfull =156+56-30 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 Z ++ V tetraquarks. (c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.

Automated summary

This study explores properties of the doubly charged vector tetraquark ZV++= [cu][sd] using QCD sum rule methods, predicting its mass and full width, and discussing methods to observe this tetraquark through specific decays.