Null radiation zone at the LHC
Abstract
The null radiation zone theorem states that, when special kinematical conditions are satisfied, all the helicity amplitudes of a partonlevel 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=8TeV LHC. The theorem predicts that the cross section for pp→jjγ 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→uuγ subprocess, which dominates in events with large jjγ 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→jjγ cross section is observable at the LHC.
 Publication:

Physical Review D
 Pub Date:
 January 2013
 DOI:
 10.1103/PhysRevD.87.014021
 arXiv:
 arXiv:1210.0973
 Bibcode:
 2013PhRvD..87a4021H
 Keywords:

 13.85.Hd;
 Inelastic scattering: manyparticle final states;
 High Energy Physics  Phenomenology;
 High Energy Physics  Experiment
 EPrint:
 doi:10.1103/PhysRevD.87.014021