论文标题
稳定的标量tetraquark $ t_ {bb; \ bar {u} \ bar {d}}}^{ - } $
Stable scalar tetraquark $T_{bb;\bar{u}\bar{d}}^{-}$
论文作者
论文摘要
标量tetraquark $ t_ {bb; \ overline {u} \ overline {d}}}^{ - } $的质量和耦合（以下情况下计算在QCD两点sum sul ulage。在计算中，我们考虑了各种夸克，gluon和混合冷凝水的影响，最高为十个尺寸。对于此状态的质量获得的结果$ m =（10135 \ pm 240）〜\ mathrm {mev} $证明了它在强和电磁衰减的情况下是稳定的。我们还探索了主导的半乳头$ t_ {b：\ overline {d}}^{ - } \ to \ widetilde {z} _ {bc; \ bar {u} \ bar {d}}美元由颜色 - 分离的diquark和Antidiquark和$ m $组成的标量tetraquark是最终的态伪内镜中的梅森斯$π^{ - }，k^{ - }，d^{ - } $和$ d_S $和$ d_s^{ - } $。这些过程的部分宽度是根据弱构想$ g_ {1（2）}（q^2）$计算得出的，这是根据QCD三分总和规则确定的。质量的预测，完整宽度$γ_ {\ Mathrm {full}} =（10.88 \ pm 1.88）\ times 10^{ - 10}〜\ mathrm {mev} $，平均寿命$τ= 0.61 _ { - 0.61 _ { - 0.09}} $ t_ {b：\ overline {d}}^{ - } $在本工作中获得的$可用于此异国情调状态的理论和实验研究。
The mass and coupling of the scalar tetraquark $T_{bb;\overline{u}\overline{d }}^{-}$ (hereafter $T_{b:\overline{d}}^{-} $) are calculated in the context of the QCD two-point sum rule method. In computations we take into account effects of various quark, gluon and mixed condensates up to dimension ten. The result obtained for the mass of this state $m=(10135\pm 240)~\mathrm{MeV} $ demonstrates that it is stable against the strong and electromagnetic decays. We also explore the dominant semileptonic $T_{b:\overline{d}}^{-} \to \widetilde{Z}_{bc;\bar{u}\bar{d}}^{0}l\overline{ν}_{l}$ and nonleptonic decays $T_{b:\overline{d}}^{-} \to \widetilde{Z}_{bc;\bar{u}\bar{ d}}^{0}M$, where $\widetilde{Z}_{bc;\bar{u}\bar{d}}^{0}$ is the scalar tetraquark composed of color-sextet diquark and antidiquark, and $M$ is one of the final-state pseudoscalar mesons $π^{-}, K^{-}, D^{-}$ and $D_s^{-}$ , respectively. The partial widths of these processes are calculated in terms of the weak form factors $G_{1(2)}(q^2)$, which are determined from the QCD three-point sum rules. Predictions for the mass, full width $Γ_{\mathrm{full}} =(10.88\pm 1.88)\times 10^{-10}~\mathrm{MeV}$, and mean lifetime $τ=0.61_{-0.09}^{+0.13}~\mathrm{ps}$ of the $T_{b:\overline{d} }^{-}$ obtained in the present work can be used in theoretical and experimental studies of this exotic state.
