在LHC的辐射区
Null radiation zone at the LHC
摘要：
零辐射区定理指出，当满足特殊的运动学条件时，由于不同图之间的相消干涉，发射矢量流的部分子级子过程的所有螺旋度振幅都消失。我们研究了在$\sqrt{s}=8$ TeV LHC上的$pp$碰撞中该定理的表现。该定理预言，当两个喷流的横动量相似，且光子和喷流团之间的快度差几乎为零时，$p p \rightarrow j j γ$事件的截面被抑制，因为在具有大$j j γ$不变性质量的事件中占主导地位的$u u \rightarrow u u γ$子过程在该区域具有强的相消干涉。我们通过MadGraph 5的计算证实了这一预测，并表明在LHC上可以观察到对$p p \rightarrow j j γ$截面的抑制。
英文摘要：
The null radiation zone theorem states that, when special kinematical conditions are satisfied, all the helicity amplitudes of a parton-level subprocess where a vector current is emitted vanish due to destructive interference among different diagrams. We study the manifestation of the theorem in $pp$ collisions at the $\sqrt{s}=8$ TeV LHC. The theorem predicts that the cross section for $p p \rightarrow j j γ$ events is suppressed when the transverse momenta of the two jets are similar and when the rapidity difference between the photon and the cluster of the jets is nearly zero, because the $u u \rightarrow u u γ$ subprocess, which dominates in events with large $j j γ$ invaraint mass, has strong destructive interference in this region. We confirm this prediction by the calculation with MadGraph 5, and show that the suppression on the $p p \rightarrow j j γ$ cross section is observable at the LHC.
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