论文标题
$λ_b$半衰减衰减的时间反转不对称
Time-reversal asymmetries in $Λ_b$ semileptonic decays
论文作者
论文摘要
我们研究了$λ_b\ \λ_c（\ to b_n f）\ ell ^ - \edlineν$，$ \ ell = e，μ，τ$，其中$ b_n $和$ f $是女儿baryons和$λ_c$ cascade scade n in $ b_n $和$ f $。特别是，我们检查了具有偏振$λ_b$和Lepton质量效应的完整角度分布，其中鉴定了时间反转不对称。我们专注于$λ_b\ \toλ_c的衰减模式（\ to p k^ - π^+）\ ell^ - \overlineν$，以证明其实验性可行性。我们表明，与时间逆转不对称相关的可观察物对于在标准模型中消失时搜索新物理学很有用。明确地，我们发现它们对新物理学的右手电流很敏感，并且可以在LHCB上观察到。
We study the decays of $Λ_b \to Λ_c(\to B_n f) \ell ^- \overlineν$ with $\ell = e, μ, τ$, where $B_n$ and $f$ are the daughter baryons and the rest of the particles in $Λ_c$ cascade decays, respectively. In particular, we examine the full angular distributions with polarized $Λ_b$ and lepton mass effects, in which the time-reversal asymmetries are identified. We concentrate on the decay modes of $Λ_b \to Λ_c(\to p K^- π^+) \ell ^- \overlineν$ to demonstrate their experimental feasibility. We show that the observables associated with the time-reversal asymmetries are useful to search for new physics as they vanish in the standard model. Explicitly, we find that they are sensitive to the right-handed current from new physics, and possible to be observed at LHCb.
