Continuum VV background

 Pairs of vector bosons are also produced in quark fusion processes giving rise to a spectrum of vector boson pairs with a relatively low invariant mass. The background is the most serious background to the H $\rightarrow$ ZZ ^* Higgs signal in the region below the threshold for a Higgs decay to two real Z bosons.

A total of 1 000 000 events of vector bosons was simulated with PYTHIA with a p_T cut in the hard scattering of 300 GeV to study this background.