A family of double-beauty tetraquarks: Axial-vector state The work of K. A, B. B., and H. S was Supported in part by the TUBITAK (119F050),Chinese Physics C

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A family of double-beauty tetraquarks: Axial-vector state The work of K. A, B. B., and H. S was Supported in part by the TUBITAK (119F050)
Chinese Physics C ( IF 3.6 ) Pub Date : 2021-01-16 , DOI: 10.1088/1674-1137/abc16d
S. S. Agaev ₁ , K. Azizi _{2,

3} , B. Barsbay _{3,

4} , H. Sundu ₄

Affiliation

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 $T_{b:\overline{s}}^{\mathrm{AV}} \to {\cal{Z}}_{b:\overline{s}}^{0}l\overline{\nu}_l$ and nonleptonic $T_{b:\overline{s}}^{\mathrm{AV}} \to {\cal{Z}}_{b:\overline{s}}^{0}M$ decays of $T_{b:\overline{s}}^{\mathrm{AV}}$ . In these processes, ${\cal{Z}}_{b:\overline{s}}^{0}$ 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 $\rho ^{-}$ , $K^{\ast}(892)$ , $D^{\ast }(2010)^{-}$ , 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 $\Gamma _{\mathrm{full}} = (12.9\pm 2.1)\times 10^{-8}\; \mathrm{MeV}$ and the mean lifetime $\tau = 5.1_{-0.71}^{+0.99}\; \mathrm{fs}$ 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 ${\cal{Z}}_{b:\overline{s}}^{0}$ is useful for experimental investigations of these double-heavy exotic mesons.

中文翻译：

一个双美四夸克家族：轴向矢量状态 K.A、BB 和 H.S 的工作得到了 TUBITAK (119F050) 的部分支持

使用量子色动力学（QCD）和规则方法探索轴向矢量四夸克的光谱参数和衰减通道 $T_{bb;\overline{u}\overline{s}}^{-}$ （在下文中，）。 $T_{b:\overline{s}}^{\mathrm{AV}}$ 该状态的质量和耦合是使用两点和规则通过考虑各种真空冷凝物来计算的，最多 10 个维度。我们对这种状态质量的预测 $m = (10215\pm 250)\; \mathrm{MeV}$ 证实，它对于强和电磁衰变是稳定的，并且只能通过弱转换分解为常规介子。我们研究了占主导地位的半轻 $T_{b:\overline{s}}^{\mathrm{AV}} \to {\cal{Z}}_{b:\overline{s}}^{0}l\overline{\nu}_l$ 子和非轻子 $T_{b:\overline{s}}^{\mathrm{AV}} \to {\cal{Z}}_{b:\overline{s}}^{0}M$ 衰变 $T_{b:\overline{s}}^{\mathrm{AV}}$ 。在这些过程中， ${\cal{Z}}_{b:\overline{s}}^{0}$ 是一个 $[bc][\overline{u}\overline{s}]$ 由一个彩色三重态二夸克和一个反二夸克构成的标量四夸克，而M是矢量介子 $\rho ^{-}$ 、 $K^{\ast}(892)$ 、 $D^{\ast }(2010)^{-}$ 和之一 $D_{s}^{\ast -}$ 。为了计算这些衰减的部分宽度，我们使用 QCD 三点和规则方法并评估控制这些过程的弱跃迁形状因子 $G_{i}$ ( )。使用上述弱衰变计算四夸克 $ i = 0,1,2,3 $ 的全宽 $\Gamma _{\mathrm{full}} = (12.9\pm 2.1)\times 10^{-8}\; \mathrm{MeV}$ 和平均寿命。获得的有关参数的信息对于这些双重奇异介子的实验研究非常有用。 $\tau = 5.1_{-0.71}^{+0.99}\; \mathrm{fs}$ $T_{b:\overline{s}}^{\mathrm{AV}}$ $T_{b:\overline{s}}^{\mathrm{AV}}$ ${\cal{Z}}_{b:\overline{s}}^{0}$

更新日期：2021-01-16

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