论文标题
CP违反$ B_S $衰减由两个几乎取代的主要中微子介导
CP violation in $B_s$ decays mediated by two nearly-degenerate Majorana neutrinos
论文作者
论文摘要
我们在Lepton-number-Violating过程中研究\ textIt {cp}违规行为$ b_s^0 \ rightArrow d_s^ - μ^+μ^+μ^+π^ - $及其\ textIt {cp} {cp} -conjugate $ \ bar {b_s^0}^0}^0}^0}^0}^d_^d_^+^ - GEV尺度的主要中微子，几乎是脱位质量。我们的结果表明，如果两个主要中微子之间的质量差异在中微子的衰减宽度附近，则\ textIt {cp}的大小可能会变得相当大。我们对其升级II内LHCB的\ textit {cp} - 侵略过程进行实验分析。分析表明，在对重中微子混合参数的当前约束下，有可能在LHCB实验能力的情况下观察到这种\ textit {cp}违规行为。在没有观察到该过程的正信号的假设下，我们还将重型混合参数$ | u_ {μn} |^2 $上的上限给出。结果表明，与先前的实验相比，这种模式可以给出互补的约束，例如NUTEV，BEBC等。在质量区域1〜GEV $ <m_n <$ 3〜GEV中。
We study the \textit{CP} violation in the lepton-number-violating process $B_s^0 \rightarrow D_s^- μ^+ μ^+ π^-$ and its \textit{CP}-conjugate process $\bar{B_s^0} \rightarrow D_s^+ μ^- μ^- π^+$ that are induced by two GeV-scale Majorana neutrinos with nearly-degenerate masses. Our result shows that the size of the \textit{CP} violation could become considerable if the mass difference between the two Majorana neutrinos is around the decay width of the neutrinos. We perform experimental analysis on the \textit{CP}-violating processes at LHCb within its upgrade II. The analysis shows that under current constraint on the heavy-light neutrino mixing parameter, it is possible that such \textit{CP} violation is observed with the LHCb experimental ability. We also give the upper bound on the heavy-light mixing parameter $|U_{μN}|^2$ under the assumption that no positive signal of the process is observed. The result shows that such modes can give complementary constraint compared with previous experiments such as NuTeV, BEBC, etc. in the mass region 1~GeV $< m_N <$ 3~GeV.
