Understanding electroweak symmetry breaking from LHC data

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The Standard Model(SM) of particle physics gives a description of all the particles and forces known to date. Over the past 50 years it has been tested to exquisite precision. The theoretical description of the Standard Model is based on an elegant symmetry principle. It allows to describe of all interactions in term of only three parameters, namely the gauge coupling constants. However, the same principle predicts that all the particles of the SM should be massless. This is not the case, which means that the symmetry must somehow be broken. This phenomenon is called electroweak symmetry breaking(EWSB) and the physics responsible for it remains to a large extend unknown and uncovering it has been one of the main quests of high energy physics, both theoretical and experimental for the past two or three decades.