Search

The semi-leptonic transition of B ¯ s → D s 2 ℓ ν ¯ to tensor meson of negative parity J P = 2 − is examined in the content of the QCD sum rules approach. The three-point correlation function is used to calculate the transition form-factors of the hadronic matrix element involved in these channels. With these transition form-factors, the predicted branching ratios are estimated as: B R [ B ¯ s → D s 2 e ν ¯ e ] = 4.32 − 2.0 + 2.0 × 10 − 3 , B R [ B ¯ s → D s 2 μ ν ¯ μ ] = 4.29 − 2.0 + 2.0 × 10 − 3 , and B R [ B ¯ s → D s 2 τ ν ¯ τ ] = 3.1 − 1.4 + 1.4 × 10 − 4. We also calculated the leptonic angular spectra and leptonic forward-backward asymmetries. The effect of the leptonic decay constant f D s 2 on these observables is also considered. The obtained orders of the branching ratios in this work are indicating that these channels can be investigated at LHCb in the near future. [ABSTRACT FROM AUTHOR]