x x x

One of the most fundamental questions addressed by parti-cle physicists today is the origin of the mass of fundamental particles. The most popular theory holds that particles ac-quire mass by interacting with a scalar field which perme-ates space- the Higgs field. This field can itself be excited, giving rise to a massive, unstable scalar boson, which can be produced in particle collisions at the LHC. If the mass of the Higgs particle is in the range of 135 to 200 GeV, it will predominantly decay to W boson pairs. In the analysis [1] presented here, we observe the W particles from their decay into muons and neutrinos. We have stud-ied simulated data from the ATLAS detector at a centre of mass energy of 14 TeV using a full Geant4 simulation and in addition events from a fast simulation using Atlfast II. Most of the simulation and analysis has been performed on the LHC Community Grid using the distributed analysis tool Ganga. [GeV]µµm 20 30 40 50 60 70 80 90 10