论文标题
解释LHCB的$λ_B\ toλ_cτ\barν$测量和拼图，以半衰减$λ_b$衰减
Interpreting LHCb's $Λ_b\to Λ_cτ\barν$ measurement and puzzles in semileptonic $Λ_b$ decays
论文作者
论文摘要
将$λ_b\ \λ_cτ\barν$的最新LHCB测量标准化为标准模型（SM）预测$λ_b\ toλ_cμcμ\barν$速率，而不是LEP测量，提供了与LEPTON FLAIMATIOL $ repio $ ratio $ rep（）$ rep（与引用的LHCB结果相比，这种适度增加了$ r（λ_c）$，因此与SM相比，它不再暗示抑制作用，这在新的物理场景中很难适应，以增强$ r（d^{（*）}）$。我们指出，在包含半抑制的$λ_b$衰减中，激发状态的比例可能大大高于$ b $衰减中的相应分数。推测可能的含义。
Normalizing the recent LHCb measurement of $Λ_b \to Λ_c τ\barν$ to the standard model (SM) prediction for the $Λ_b \to Λ_c μ\barν$ rate, instead of a LEP measurement, provides a more consistent comparison with the SM prediction for the lepton flavor universality ratio $R(Λ_c)$. This modestly increases $R(Λ_c)$ compared to the quoted LHCb result, such that it no longer hints at a suppression compared to the SM, which would be hard to accommodate in new physics scenarios that enhance $R(D^{(*)})$. We point out that the fraction of excited states in inclusive semileptonic $Λ_b$ decay may be significantly greater than the corresponding fraction in $B$ decays. Possible implications are speculated upon.
