论文标题
$λ_B（6146）^0 $状态新观察到LHCB
$Λ_b(6146)^0$ state newly observed by LHCb
论文作者
论文摘要
我们研究了LHCB协作新发现的底部$λ_B（6146）^0 $ BARYON。通过采用$（l_ρ，l_λ）的插值电流=（0,2）$ type和$ d $ - 波自然，带有自旋 - 量子量子数字$ j^p = \ frac {3} {2} {2}^+$，用于此重底部的baryon，我们计算其质量和残基。使用这些光谱参数，我们还研究了其主要衰减$λ_b（6146）^0 \rightArrowς_bπ$和$λ_b（6146）^0 \rightArrowς^*_bπ$，并估计通过这些通道获得的$λ_b（6146）^0 $的宽度。获得的质量，$ m_ {λ_b} =（6144 \ pm 68）$ 〜MEV符合实验数据。通过主要通道获得的宽度也与LHCB协作的实验数据一致。我们计算$ c $ - 零件的$λ_b（6146）^0 $状态的$ c $ - 零件的光谱参数和相同的衰减通道。我们将获得的结果与现有的理论预测以及实验数据进行了比较。结果表明，状态$λ_b（6146）^0 $及其魅力 - 帕特纳$λ_C（2860）^+$可以被视为$ 1D $ -WAVE BARYON，带有$ J^p = \ frac {3} {3} {2} {2}^+$。
We study the bottom $Λ_b(6146)^0$ baryon, newly discovered by the LHCb Collaboration. By adopting an interpolating current of $(L_ρ, L_λ)=(0,2)$ type and $D$-wave nature with spin-parity quantum numbers $J^P=\frac{3}{2}^+$ for this heavy bottom baryon, we calculate its mass and residue. Using these spectroscopic parameters, we also investigate its dominant decays $Λ_b(6146)^0\rightarrowΣ_bπ$ and $Λ_b(6146)^0\rightarrowΣ^*_bπ$ and estimate the width of $Λ_b(6146)^0$ obtained via these channels. The obtained mass, $m_{Λ_b}=(6144\pm 68)$~MeV is in accord nicely with the experimental data. The width obtained via the dominant channels is also consistent with the experimental data of LHCb collaboration. We calculate the spectroscopic parameters and the same decay channels for the $c$-partner of $Λ_b(6146)^0$ state, namely $Λ_c(2860)^+$, as well. We compare the obtained results with the existing theoretical predictions as well as experimental data. The results indicate that the state $Λ_b(6146)^0$ and its charmed-partner $Λ_c(2860)^+$ can be considered as $1D$-wave baryons with $J^P=\frac{3}{2}^+$.
