论文标题
红外安全的抗$ k_t $喷气机
Infrared-safe flavoured anti-$k_T$ jets
论文作者
论文摘要
在实验方面，风味标记在技术上具有挑战性。但是，从理论的角度来看，它遇到了一个更基本的问题，尤其是在固定顺序扰动理论中实施时。事实证明，由于风味夸克 - 夸克对毫无用处的能量的发射引起的奇异性，红外的风味射流定义是复杂的。尽管通过修改标准$ k_t $ jet算法来解决此问题，但这种情况并不完全令人满意，因为大多数测量值而不是使用抗$ k_t $ jet算法。在这项工作中，我们提出了对抗$ k_t $ jet算法的风味红外护理修改，该算法易于在扰动的蒙特卡洛框架内实现，并且在不需要风味标记时对喷气现象学的影响很小。除了对临近临时算法的红外安全性验证的数值验证外，我们还提出了与$ b $ -JET相关的Lepton对制作的结果，以及一对腐烂成$ b $ jet和Leptons的顶级对。
Flavour tagging is technically challenging on the experimental side. However, it suffers from a more fundamental problem from the theoretical point of view, in particular when implemented in fixed-order perturbation theory. It turns out that an infrared-safe definition of a flavoured jet is intricate due to the singularities induced by the emission of flavoured quark-anti-quark pairs of negligible energy. Although this issue has been addressed by a modification of the standard $k_T$ jet algorithm, the situation is not entirely satisfactory as most measurements rather use the anti-$k_T$ jet algorithm. In this work, we propose a flavour-aware infrared-safe modification of the anti-$k_T$ jet algorithm that is easy to implement within perturbative Monte Carlo frameworks and has minor impact on jet phenomenology when flavour tagging is not required. Besides the numerical verification of the infrared safety of the proposed algorithm at next-to-next-to-leading order, we also present results for the hadro-production of a lepton pair in association with a $b$-jet, and of a top-quark pair decaying into $b$-jets and leptons.
