2012/10/31 by Kaoru Hagiwara, Toshifumi Yamada · 1 citation
Physics and Astronomy · #Amplitude #Black Holes and Theoretical Physics #Helicity #High-Energy Particle Collisions Research #Invariant mass #Large Hadron Collider #Nuclear physics #Null (SQL) #Observable #Particle physics #Particle physics theoretical and experimental studies #Parton #Photon #Physics #Quantum mechanics #Quark #Rapidity #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.87.014021
arxiv created 2013/01/08 · openalex publication_date 2013/01/28 · arxiv updated 2013/05/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 √(s)=8 TeV LHC. The theorem predicts that the cross section for pp\ensuremath→jj\ensuremathγ 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 uu\ensuremath→uu\ensuremathγ subprocess, which dominates in events with large jj\ensuremathγ invariant 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 pp\ensuremath→jj\ensuremathγ cross section is observable at the LHC.