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|Paper IPM / Particles And Accelerator / 15965||
The mass and coupling of the scalar tetraquark Tbb;―u―d− (hereafter Tb:―d− ) are calculated in the context
of the QCD two-point sum rule method. In computations we take into account
effects of various quark, gluon and mixed condensates up to dimension ten.
The result obtained for the mass of this state m=(10135±240) MeV demonstrates that it is stable against the strong and electromagnetic
decays. We also explore the dominant semileptonic Tb:―d−→ ~Zbc;―u―d0l―νl and
nonleptonic decays Tb:―d− → ~Zbc;―u―d0M, where ~Zbc;―u―d0 is the color-sextet
scalar tetraquark, and M is one of the final-state pseudoscalar mesons π−, K−, D− and Ds−, respectively. The partial widths of
these processes are calculated in terms of the weak form factors G1(2)(q2), which are determined from the QCD three-point sum rules.
Predictions for the mass, full width Γfull = (10.88±1.88)×10−10 MeV, and mean lifetime τ = 0.61−0.09+0.13 ps of the Tb:―d−
obtained in the present work can be used in theoretical and experimental
studies of this exotic state.
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