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Paper   IPM / Particles And Accelerator / 15965
School of Particles and Accelerator
  Title:   Stable scalar tetraquark Tbb;ud
1.  S. S Agaev
2.  Kazem Azizi
3.  B Barsbay
4.  H Sundu
  Status:   Published
  Journal: Eur. Phys. J. A
  No.:  177
  Vol.:  56
  Year:  2020
  Supported by:  IPM
The mass and coupling of the scalar tetraquark Tbb;ud (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;ud0lνl and nonleptonic decays Tb:d~Zbc;ud0M, where ~Zbc;ud0 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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