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首页> 外文期刊>The European Physical Journal, A. Hadrons and Nuclei >Stable scalar tetraquark T_(bb;ud)~?
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Stable scalar tetraquark T_(bb;ud)~?

机译：稳定的标量tetraquark t_（bb; ud）〜？

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摘要

The mass and coupling of the scalar tetraquark T_(bb;ud)~?(hereafter T_(b: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 ± 240) MeV demonstrates that it is stable against the strong and electromagnetic decays. We also explore the dominant semileptonic T_(b:d)~?→ Z_(bc;ud)~0 lν_l and nonleptonic decays T _(b:d)~?→Z_(bc;ud)~0 M, where Z_(bc;ud)~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_(full) = (10.88 ± 1.88) × 10~(?10) MeV, and mean lifetime τ = 0.61_(?0.09)~(+0.13) ps of the T_(b:d)~? obtained in the present work can be used in theoretical and experimental studies of this exotic state.
机译：标量四夸克T_bb；ud）~？（以下简称T_b:d）~？）在QCD两点求和规则方法的背景下计算。在计算中，我们考虑了各种夸克、胶子和高达10维的混合凝聚体的影响。该态质量m=（10135±240）MeV的结果表明，它对强衰变和电磁衰变是稳定的。我们还探讨了占主导地位的半轻子T_Ub（d）~？→ Z_0;（bc；ud）~0lνl与非轻子衰变T_0;（b:d）~？→Z_0;（bc；ud）~0m，其中Z_0bc；ud）~0是由色六重双夸克和反夸克组成的标量四夸克，M是终态赝标量介子π~？，K~？，D~？和D_s~-。这些过程的部分宽度是根据由QCD三点求和规则确定的弱形状因子G_1（2））（q~2来计算的。对TΓ（b:d）的质量、全宽Γ（full）=（10.88±1.88）×10~（-10）MeV和平均寿命τ=0.61_（？0.09）~（+0.13）ps的预测？本文所得结果可用于这种奇异状态的理论和实验研究。

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