论文标题
两极分化的$λ_b$ baryon衰减到$pπ$和dilepton对
Polarized $Λ_b$ baryon decay to $pπ$ and a dilepton pair
论文作者
论文摘要
$ b \ to s \ ell^+\ ell^ - $ transitions中的最新异常可能源自标准模型以外的一些新物理。要确认或排除此假设，需要更多的$ b \ to s \ ell^+\ ell^ - $ transition的测试。两极分化的$λ_b$ $衰减对$λ$，而Dilepton对提供了许多可观察到的物品，这些可观察到适合将新物理与标准模型区分开。在本文中，我们对$λ（\ topπ）\ ell^+\ ell^ - $ final状态进行了对两极分化的$λ_b$衰减的完整角度分析。该研究是在一组操作员中进行的，其中标准模型操作员的手性翻转了，以及新的标量和伪量表运算符。全角分布是通过保留最终状态钩子的质量来计算的。在低辐线器后坐力下，我们使用重夸克有效理论框架来关联辐射形式因子，从而简化了短距和长距离物理学分解的角度可观察物的表达。使用可观察物的分解表达式，我们构建了许多短距和长距离物理学的测试，包括标准模型的无效测试及其手性翻转，可以使用实验数据进行。
The recent anomalies in $b\to s\ell^+\ell^-$ transitions could originate from some New Physics beyond the Standard Model. Either to confirm or to rule out this assumption, more tests of $b\to s\ell^+\ell^-$ transition are needed. Polarized $Λ_b$ decay to a $Λ$ and a dilepton pair offers a plethora of observables that are suitable to discriminate New Physics from the Standard Model. In this paper, we present a full angular analysis of a polarized $Λ_b$ decay to a $Λ(\to pπ)\ell^+\ell^-$ final state. The study is performed in a set of the operator where the Standard Model operator basis is supplemented with its chirality flipped counterparts, and new scalar and pseudo-scalar operators. The full angular distribution is calculated by retaining the mass of the final state leptons. At the low hadronic recoil, we use the Heavy Quark Effective Theory framework to relate the hadronic form factors which lead to simplified expression of the angular observables where short- and long-distance physics factorize. Using the factorized expressions of the observables, we construct a number of tests of short- and long-distance physics including null tests of the Standard Model and its chirality flipped counterparts that can be carried out using experimental data.
