论文标题
包容性的弱化衰减和美容baryons的寿命
Inclusive weak-annihilation decays and lifetimes of beauty-charmed baryons
论文作者
论文摘要
不平衡的美容式巴元$ξ_{bc}^{+，0} $对浓风味物理的发展具有重要意义。在这项工作中，我们研究了$ξ_{bc}^{+，0} $的包容性弱渗透衰减及其对$ξ_{bc}^{+，0} $ lifetimes的贡献。为了计算包含$ξ_{bc}^{ +，0} \ to x_ {cs} $衰减宽度，其中$ x_ {cs} $代表最终状态的总和+1和奇怪的数字-1，我们在较重的diquark有效理论中工作，我们在构造技术工具方便的型技术工具中工作。 $ξ_{bc}^{+，0} $被认为是两个状态的叠加，一个状态包含一个spin-0 $ bc $ diquark，另一个包含一个spin-1 $ bc $ diquark。发现$ξ_{bc}^{+，0} $ lifetimes和$ξ_{bc}^{+，0} \ to x_ {cs} $分支比对$ bc $ spin非常敏感，以$ bc $ spin in $ necy in $ξ_{bc} {bc} {bc}^{+，0} $。 $ξ_{bc}^{+，0} \ to x_ {cd} $结果也会显示。因为$ξ_{bc}^+$具有比$ξ_{bc}^{0} $的寿命更长λ_c^+\ bar {k}^{（*）0} $，$ξ_{bc}^+\ to d^{（*）+}+} k^-p $，和$ξ_{bc}^+\ to d^{0} {0} $ξ_{bc}^{+，0} $在LHC上与独家衰减$ξ_{b c}^{0} \ to d^0pk^ - $。
Imbalanced beauty-charmed baryons $ Ξ_{bc}^{+,0} $ are of great significance to the development of heavy flavor physics. In this work, we study the inclusive weak-annihilation decays of $Ξ_{bc}^{+,0}$ and their contributions to the $Ξ_{bc}^{+,0}$ lifetimes. For the calculation of the inclusive $Ξ_{bc}^{+,0}\to X_{cs}$ decay width where $X_{cs}$ stands for the sum of the final states with charm number +1 and strange number -1, we work in the heavy diquark effective theory which provides us with a convenient technical tool to construct the operator product expansion. The $Ξ_{bc}^{+,0}$ is considered to be a superposition of two states with one containing a spin-0 $bc$ diquark and the other one containing a spin-1 $bc$ diquark. It is found that both the $Ξ_{bc}^{+,0}$ lifetimes and the $Ξ_{bc}^{+,0}\to X_{cs}$ branching ratios are very sensitive to the $bc$ spin in $Ξ_{bc}^{+,0}$. The $Ξ_{bc}^{+,0}\to X_{cd}$ results are also presented. As $Ξ_{bc}^+$ has a longer lifetime than $Ξ_{bc}^{0}$ and bigger branching ratios of similar decay channels, the exclusive decays $Ξ_{bc}^+\to D^{(*)+}Λ$, $Ξ_{bc}^+\to Λ_c^+\bar{K}^{(*)0}$, $Ξ_{bc}^+\to D^{(*)+}K^-p$, and $Ξ_{bc}^+\to D^{0}\bar{K}^{(*)0}p$ are more promising for experimental searches of $Ξ_{bc}^{+,0}$ at the LHC comparing with exclusive decay $Ξ_{b c} ^{0} \to D^0pK^-$.
