  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 $p p \rightarrow j j \gamma$ 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 $u u \rightarrow u u \gamma$ subprocess, which dominates in events
with large $j j \gamma$ 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 $p p \rightarrow j j \gamma$ cross section is
observable at the LHC.
