论文标题
$ z $ -boson衰减的调查为$ξ_{bc} $和$ξ_{bb} $ baryon with nrqcd factorizations方法
Investigation for $Z$-boson decay into $Ξ_{bc}$ and $Ξ_{bb}$ baryon with the NRQCD factorizations approach
论文作者
论文摘要
$ Z $ -BOSON衰减为$ξ_{bq'} $ BARYON的研究提供了很好的机会，这是由于可以在高能煤矿上收集的$ Z $事件。 We performed a completed investigation of the indirect production of the $Ξ_{bc}$ and $Ξ_{bb}$ baryon via $Z$-boson decay $Z\to Ξ_{bQ'}+\bar b +\bar Q'$ with $Q'= (c, b)$ quark according to NRQCD factorizations approach.在考虑了diquark状态$ \ langle bc \ rangle [^3s_1] _ {\ bar 3/6} $之后bb \ rangle [^3S_1] _ {\ bar 3} $，$ z \toξ_{bq'}+x $的计算分支比率是$ {\ cal b}（z \to葱_ {bc}+x） b}（z \toξ_{bc}+x）= 1.213 \ times 10^{ - 6} $。此外，预计所产生的$ξ_{bc} $事件将在LHC（CEPC）上的$ 10^4（10^7）$订单，而$ 10^3（10^6）$订单的$ξ_{bb} $事件被预测为$ 10^3（10^6）$。此外，我们已经估计了具有四个$ z $ -Boson衰减通道的生产比$ {\ cal r}（z_q \ tope了ξ^{+，0} _ {bc}）$。 $ {\ cal r}（z_q \toξ^{+，0} _ {bc}）$最高$ 10^{ - 6} $ for $ z \ for $ z \ to c \ bar c $ channel，$ 10^{ - 5} $，分别是$ z \ for $ z \ for $ z \ for b bar b \ bar b \ b \ b \ b $ channel。最后，我们就$ s_ {23} $和$ z $ distributions介绍$ξ_{bc} $的微分衰减宽度（ξ_{bb}）$，并分析了不确定性。
The $Z$-boson decay provides good opportunities for the research on $Ξ_{bQ'}$ baryon due to large quantity of $Z$ events that can be collected at the high-energy colliders. We performed a completed investigation of the indirect production of the $Ξ_{bc}$ and $Ξ_{bb}$ baryon via $Z$-boson decay $Z\to Ξ_{bQ'}+\bar b +\bar Q'$ with $Q'= (c, b)$ quark according to NRQCD factorizations approach. After considering the contribution of the diquark states $\langle bc\rangle [^3S_1]_{\bar 3/6}$, $\langle bc\rangle [^1S_0]_{\bar 3/6}$, $\langle bb\rangle [^1S_0]_{6}$ and $\langle bb\rangle [^3S_1]_{\bar 3}$, the calculated branching ratio for $Z\toΞ_{bQ'}+X$ are ${\cal B}(Z\toΞ_{bc}+X) = 3.595\times 10^{-5}$ and ${\cal B}(Z\toΞ_{bc}+X) = 1.213\times 10^{-6}$. Moreover, the $Ξ_{bc}$ events produced are predicted to be of the $10^4(10^7)$ order at the LHC(CEPC), while the $Ξ_{bb}$ events produced are forecasted to be of the $10^3(10^6)$ order. Furthermore, we have estimated the production ratio ${\cal R}(Z_Q\toΞ^{+,0}_{bc})$ with four $Z$-boson decay channels. The ${\cal R}(Z_Q\toΞ^{+,0}_{bc})$ up to $10^{-6}$ for $Z\to c\bar c$ channel and $10^{-5}$ for $Z\to b\bar b$ channel, respectively. Finally, we present the differential decay widths of $Ξ_{bc}(Ξ_{bb})$ with respect to $s_{23}$ and $z$ distributions, and analysis the uncertainties.
