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Paper   IPM / Particles And Accelerator / 15651
School of Particles and Accelerator
  Title:   Semileptonic decays of the scalar tetraquark Zbc;ud0
1.  Hayriye Sundu
2.  Shahin. S Agaev
3.  Kazem Azizi
  Status:   Published
  Journal: Eur. Phys. J. C
  No.:  9, 753
  Vol.:  79
  Year:  2019
  Supported by:  IPM
We study semileptonic decays of the scalar tetraquark Zbc;ud0 to final states Tbs;ude+νe and Tbs;udμ+νμ, which run through the weak transitions cse+νe and csμ+νμ, respectively. To this end, we calculate the mass and coupling of the final-state scalar tetraquark Tbs;ud by means of the QCD two-point sum rule method: these spectroscopic parameters are used in our following investigations. In calculations we take into account the vacuum expectation values of the quark, gluon, and mixed operators up to dimension ten. We use also three-point sum rules to evaluate the weak form factors Gi(q2) (i=1, 2) that describe these decays. The sum rule predictions for Gi(q2) are employed to construct fit functions Fi(q2), which allow us to extrapolate the form factors to the whole region of kinematically accessible q2. These functions are required to get partial width of the semileptonic decays Γ(Zbc0Te+νe) and Γ(Zbc0Tμ+νμ) by integrating corresponding differential rates. The obtained results for the total width Γtot.=(2.37±0.36)×10−11 MeV and mean lifetime 27.8−3.7+4.9 ps of the tetraquark Zbc;ud0 can be used in experimental investigations of this exotic state.

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