论文标题
轴向矢量tetraquark $ t_ {bb; \ overline {u} \ overline {d}}^{ - }
Semileptonic and nonleptonic decays of the axial-vector tetraquark $T_{bb;\overline{u} \overline{d}}^{-}$
论文作者
论文摘要
双轴轴向矢量tetraquark $ t_ {bb; \ edimelline {u} \ overline {d}}^{ - } $ to nate $ \ widetilde {t} {t} _ {bc;在QCCD总和规则方法的背景下，研究了研究研究\ edline {最终态tetraquark $ \ widetilde {t} _ {bc}^{0} $被视为由重型轴向矢量diquark $ b^{t}γ__{μ} cc $和轻量标cc $和轻型标量抗Quark $ \ + ediquark $ \ operline {u}cγ_______________________________________________________________________________________________________________________________________________ \ edline {d}^{t} $。它的光谱参数是通过考虑Quark，Gluon和混合冷凝水的贡献，最多达到尺寸$ 10 $，使用两点总和规则计算。我们研究主导的半肌$ t_ {bb}^{ - } \ to \ widetilde {t} _ {bc}^{0} l \ ediflline {c {ν} _ {l} _ {l} \ wideTilde {t} _ {bc}^{0} m $，其中$ m $是伪calloscalar mesons $π^{ - }，k^{ - }，d^{ - } $和$ d_s^{ - } $。这些过程的部分宽度是根据弱的形式$ g_ {i}（q^2），\ i = 1,2,3,4 $计算的，该宽度是通过采用QCD三点总规则方法来提取的。对于所考虑的衰减的部分宽度获得的预测用于提高理论预测的准确性，以使Tetraquark $ t_ {bb}^{ - } $的全宽度和寿命，这对于对这种异国情调的梅森的实验探索很重要。
The semileptonic and nonleptonic decays of the double-beauty axial-vector tetraquark $T_{bb;\overline{u} \overline{d}}^{-}$ to a state $\widetilde{T}_{bc; \overline{u}\overline{d}}^{0}$ (hereafter $T_{bb}^{-}$ and $\widetilde{T} _{bc}^{0}$, respectively) are investigated in the context of the QCD sum rule method. The final-state tetraquark $\widetilde{T}_{bc}^{0}$ is treated as an axial-vector particle built of a heavy axial-vector diquark $ b^{T}γ_{μ}Cc$ and light scalar antidiquark $\overline{u}Cγ_{5} \overline{d}^{T}$. Its spectroscopic parameters are calculated using the two-points sum rules by taking into account contributions of quark, gluon and mixed condensates up to dimension $10$. We study the dominant semileptonic $T_{bb}^{-} \to \widetilde{T}_{bc}^{0}l\overline{ν}_{l}$ and nonleptonic decays $T_{bb}^{-} \to \widetilde{T}_{bc}^{0}M$, where $M$ is one of the pseudoscalar mesons $π^{-}, K^{-}, D^{-}$ and $D_s^{-}$. The partial widths of these processes are computed in terms of weak form factors $G_{i}(q^2),\ i=1,2,3,4$, extracted by employing the QCD three-point sum rule approach. Predictions obtained for partial widths of considered decays are used to improve accuracy of theoretical predictions for full width and lifetime of the tetraquark $T_{bb}^{-}$, which are important for experimental exploration of this exotic meson.
