Null radiation zone at the LHC
Null radiation zone at the LHC
复制标题
大型强子对撞机的零辐射区
DOI：
10.1103/physrevd.87.014021
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发表时间：
2013
影响因子：
5
通讯作者：
Kaoru Hagiwara
中科院分区：
文献类型：
--
作者：
Toshifumi Yamada;Kaoru Hagiwara
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了。我们研究了碰撞定理在LHC上的表现形式。该定理预言，当两个喷注的横动量相近，且光子与喷注团的快度差接近于零时，由于在大不变质量事件中占主导地位的子过程在这一区域具有强的相消干涉，因此，截面阻止被抑制。我们通过MadGraph 5的计算证实了这一预测，并表明在LHC上可以观察到横截面上的抑制。
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 incollisions at theLHC. The theorem predicts that the cross section forevents 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 thesubprocess, which dominates in events with largeinvariant mass, has strong destructive interference in this region. We confirm this prediction by the calculation with MadGraph 5, and show that the suppression on thecross section is observable at the LHC.