论文标题
外来分子的质量和宽度
Masses and widths of the exotic molecular $B_{(s)}^{(*)} B_{(s)}^{(*)}$ states
论文作者
论文摘要
我们研究了双重底部系统$ bb $，$ b^* b $，$ b_s b $，$ b_s^* b $，$ b^* b^* $，$ b^* b^* b^* b^* b^* b^* b_s^* $，$ b_s b_s b_s b_s b_s $，$ b_s b_s b_s b_s b_s b_s b_s b_s b_s^$ b_s^$ b_s^b_s^b_s^* b_s^* b_s^* b_s^* b_s^* b_s^* b_s^* b_s^* b_s^* b_s^* b_s^* b_s^**局部隐藏量表方法的扩展。完整的S波散射矩阵是通过Bethe-Salpeter方程在耦合通道中实现单位性的。 We find poles below the channel thresholds for the attractively interacting channels $B^* B$ in $I=0$, $B^*_s B-B^*B_s$ in $I=\frac{1}{2}$, $B^* B^*$ in $I=0$, and $B^*_s B^*$ in $I=\frac{1}{2}$, all of them with $ j^p = 1^+$。对于这些情况，评估宽度识别假想部分的主要来源。我们发现$ 10-20 $ MEV的订单的绑定能量，宽度从一个系统到另一个系统的差异很大：$ b^*b $系统和$ b^*_ s b-b^*b_s $的订单为10-100 ev，大约是$ b^*b^*b^*$ 0.5 $ b^*$ b^*$ b^*$ 6 $ MEV。
We study the interaction of the doubly bottom systems $BB$, $B^* B$, $B_s B$, $B_s^* B$, $B^* B^*$, $B^* B_s$, $B^*B_s^*$, $B_s B_s$, $B_s B_s^*$, $B_s^* B_s^*$ by means of vector meson exchange with Lagrangians from an extension of the local hidden gauge approach. The full s-wave scattering matrix is obtained implementing unitarity in coupled channels by means of the Bethe-Salpeter equation. We find poles below the channel thresholds for the attractively interacting channels $B^* B$ in $I=0$, $B^*_s B-B^*B_s$ in $I=\frac{1}{2}$, $B^* B^*$ in $I=0$, and $B^*_s B^*$ in $I=\frac{1}{2}$, all of them with $J^P=1^+$. For these cases the widths are evaluated identifyng the dominant source of imaginary part. We find binding energies of the order of $10-20$ MeV, and the widths vary much from one system to the other: of the order of 10-100 eV for the $B^* B$ system and $B^*_s B-B^*B_s$, about $6$ MeV for the $B^* B^*$ system and of the order of $0.5$ MeV for the $B^*_s B^*$ system.
