论文标题
双胎tetraquarks的家族：轴 - 矢量状态$ t_ {bb; \ bar {u} \ bar {s}}}}^{ - } $
A family of double-beauty tetraquarks: Axial-vector state $T_{bb;\bar{u}\bar{s}}^{-}$
论文作者
论文摘要
轴向矢量tetraquark $ t_ {bb; \ overline {u} \ edline {s}}^{ - } $的光谱参数和衰减通道（QCD）总规则方法。该状态的质量和耦合是通过考虑到多种真空冷凝物（最多10个维度）的两点总和规则来计算的。我们对该状态质量的预测$ m =（10215 \ pm 250）〜\ mathrm {mev} $证实，对于强和电磁衰变，它是稳定的，并且只能通过弱变换来与常规介子分离。我们研究了主导的半雌性$ t_ {b：\ overline {s}}^{\ mathrm {av}}} \ to \ mathcal {z} _ {b：\ overline {s}}}美元在这些过程中，$ \ nathcal {z} _ {b：\ overline {s}}}^{0} $是标量tetraquark $ [bc] [\ overline {u} \ overline {u} \ overline {s} $构建的color-triplet diquark和and antidquark和antidquark $ sos $ $ $ $ρ^{ - } $，$ k^{\ ast}（892）$，$ d^{\ ast}（\ ast}（2010）^{ - } $，和$ d_ {s}^{\ ast-} $。为了计算这些衰变的部分宽度，我们使用QCD三分总规则方法并评估控制这些过程的弱过渡形式$ g_ {i} $ $（i = 0,1,2,3）$。完整宽度$γ_ {\ Mathrm {full}} =（12.9 \ pm 2.1）\ times 10^{ - 8}〜\ mathrm {mev} $和平均寿命$τ= 5.1 _ _ { - 0.71} $ t_ {b：\ overline {s}}^{\ mathrm {av}} $是使用上述弱衰减计算的。获得的有关$ t_ {b：\ overline {s}}^{\ mathrm {av}} $和$ \ mathcal {z} _ {b：\ overline {s}}^{0} $的信息非常有用
The spectroscopic parameters and decay channels of the axial-vector tetraquark $T_{bb;\overline{u}\overline{s}}^{-}$ (in what follows, $T_{b: \overline{s}}^{\mathrm{AV}}$) are explored using the quantum chromodynamics (QCD) sum rule method. The mass and coupling of this state are calculated using two-point sum rules by taking into account various vacuum condensates, up to 10 dimensions. Our prediction for the mass of this state $m=(10215\pm 250)~ \mathrm{MeV}$ confirms that it is stable with respect to strong and electromagnetic decays and can dissociate to conventional mesons only via weak transformations. We investigate the dominant semileptonic $T_{b:\overline{s} }^{\mathrm{AV}} \to \mathcal{Z}_{b:\overline{s}}^{0}l\overlineν_l$ and nonleptonic $T_{b:\overline{s}}^{\mathrm{AV}} \to \mathcal{Z}_{b:\overline{s} }^{0}M$ decays of $T_{b:\overline{s}}^{\mathrm{AV}}$. In these processes, $ \mathcal{Z}_{b:\overline{s}}^{0}$ is a scalar tetraquark $[bc][\overline{u} \overline{s}]$ built of a color-triplet diquark and an antidiquark, whereas $M$ is one of the vector mesons $ρ^{-}$, $K^{\ast}(892)$, $D^{\ast }(2010)^{-}$, and $D_{s}^{\ast -}$. To calculate the partial widths of these decays, we use the QCD three-point sum rule approach and evaluate the weak transition form factors $G_{i}$ $(i=0,1,2,3)$, which govern these processes. The full width $Γ_{\mathrm{full}} =(12.9\pm 2.1)\times 10^{-8}~\mathrm{MeV}$ and the mean lifetime $ τ=5.1_{-0.71}^{+0.99}~\mathrm{fs}$ of the tetraquark $T_{b:\overline{s}}^{ \mathrm{AV}}$ are computed using the aforementioned weak decays. The obtained information about the parameters of $T_{b:\overline{s}}^{\mathrm{AV}}$ and $ \mathcal{Z}_{b:\overline{s}}^{0}$ is useful for experimental investigations of these double-heavy exotic mesons.
