论文标题
通过$ω_c$的非lectonic弱衰减来发现激动的$ω$ baryons
Toward discovering the excited $Ω$ baryons through nonleptonic weak decays of $Ω_c$
论文作者
论文摘要
使用Quark模型研究了非质子弱衰减过程$ω_c\ toωπ^+/ω（1p）π^+/ω（1D）π^+/ω（2S）π^+$。 $ω_c\ toωπ^+$的分支分数预计为$ 1.0 \％$。考虑到新观察到的$ω（2012）$共振是一种常规$ 1p $ -Wave $ω$激发状态，带有旋转 - parity $ j^p = 3/2^ - $，新测量的比率$ \ nathcal {b} ]/\ Mathcal {b} [ω_c\ toωπ^+] $可以很好地理解。此外，缺少$ 1P- $ WAVE状态$ω（1^2p_ {1/2^ - }）$的生产率，两个旋转四重奏$ 1D- $ WAVE状态$ω（1^4D_ {1/2^+}）还研究了$ω（2^2s_ {1/2^+}）$和$ω（2^4S_ {3/2^+}）$。预计这些缺失的$ω$重子应该在Belle II和/或LHCB的即将进行的实验中，通过$ω_c$的非副本弱衰减具有巨大的潜力。
The nonleptonic weak decay processes $Ω_c \to Ωπ^+/Ω(1P)π^+/Ω(1D)π^+/Ω(2S)π^+$ are studied using the constituent quark model. The branching fraction of $Ω_c \to Ωπ^+$ is predicted to be $1.0\%$. Considering the newly observed $Ω(2012)$ resonance as a conventional $1P$-wave $Ω$ excite state with spin-parity $J^P=3/2^-$, the newly measured ratio $\mathcal{B}[Ω_c\to Ω(2012)π^+ \to (Ξ\bar{K})^-π^+ ]/\mathcal{B}[Ω_c\to Ωπ^+]$ at Belle can be well understood. Besides, the production rates for the missing $1P-$wave state $Ω(1^2P_{1/2^-})$, two spin quartet $1D-$wave states $Ω(1^4D_{1/2^+})$ and $Ω(1^4D_{3/2^+})$, and two $2S$-wave states $Ω(2^2S_{1/2^+})$ and $Ω(2^4S_{3/2^+})$ are also investigated. It is expected that these missing excited $Ω$ baryons should have large potentials to be discovered through the nonleptonic weak decays of $Ω_c$ in forthcoming experiments by Belle II and/or LHCb.
