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arXiv 1801.00536hep-phhep-ex
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$\bar{B}^0$、$\bar{B}^0_s$和$B^-$衰变为$η_c$和一个标量介子

$\bar{B}^0$, $\bar{B}^0_s$ and $B^-$ decays into $η_c$ plus a scalar meson

Ju-Jun Xie, Gang Li

摘要:

考虑$\bar{B}$介子弱衰变为$η_c$和$q\bar{q}$对的主导过程,在理论框架下研究了$\bar{B}^0_s$、$\bar{B}^0$和$B^-$衰变为$η_c$和一个标量介子的过程.这个$q\bar{q}$组件强子化成对的赝标介子后,我们得到一定的权重的赝标介子赝标介子组件。计算是基于标量介子$f_0(500)$、$f_0(980)$和$a_0(980)$是在$S$波中由赝标介子-赝标介子相互作用产生的动态态的假设。在全局归一化因子下,预测了$\bar B^0_s \to η_c π^+ π^-$、$\bar{B}^0_s \to η_c K^+ K^-$、$\bar B^0 \to η_c π^+ π^-$、$\bar{B}^0 \to η_c K^+ K^-$、$\bar{B}^0 \to η_c π^0 η$、$B^- \to η_c K^0 K^-$和$B^- \to η_c π^- η$衰变的$ππ$、$K \bar{K}$和$πη$不变质量分布.与有限的实验资料和其他理论计算进行了比较。进一步将这些结果与LHCb的测量结果进行比较,将有助于我们进一步理解低位标量介子$f_0(500), f_0(980)$和$a_0(980)$的性质。

英文摘要:

We investigate the decays of $\bar{B}^0_s$, $\bar{B}^0$ and $B^-$ into $η_c$ plus a scalar meson in a theoretical framework by taking into account the dominant process for the weak decay of $\bar{B}$ meson into $η_c$ and a $q\bar{q}$ pair. After hadronization of this $q\bar{q}$ component into pairs of pseudoscalar mesons we obtain certain weights for the pseudoscalar meson-pseudoscalar meson components. The calculation is based on the postulation that the scalar mesons $f_0(500)$, $f_0(980)$ and $a_0(980)$ are dynamically generated states from the pseudoscalar meson-pseudoscalar meson interactions in $S$-wave. Up to a global normalization factor, the $ππ$, $K \bar{K}$ and $πη$ invariant mass distributions for the decays of $\bar B^0_s \to η_c π^+ π^-$, $\bar{B}^0_s \to η_c K^+ K^-$, $\bar B^0 \to η_c π^+ π^-$, $\bar{B}^0 \to η_c K^+ K^-$, $\bar{B}^0 \to η_c π^0 η$, $B^- \to η_c K^0 K^-$ and $B^- \to η_c π^- η$ are predicted. Comparison is made with the limited experimental information available and other theoretical calcualtions. Further comparison of these results with coming LHCb measurements will be very valuable to make progress in our understanding of the nature of the low lying scalar mesons, $f_0(500), f_0(980)$ and $a_0(980)$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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