The hypothetical Higgs boson, often dubbed the "God particle", is fundamental to our understanding of the Universe but has yet to be detected.The Higgs boson has been proffered to explain the mystery of why other particles have mass, and forms the missing piece in the puzzle that is the Standard Model - the current theory used to describe the fundamental nature of matter.
For years, researchers have been searching the sub-atomic "soup" created when particles are smashed together in colliders - but no sign of the Higgs has been seen. In obtaining a more precise predicted mass for the Higgs, the particle's existence can be confirmed or ruled out within two to three years, scientists believe.
The calculation has been done by making the finest measurement to date of the mass of another elementary particle, one that is well known, the W boson. The W boson is the carrier of weak nuclear force, one of the fundamental forces in nature, and its mass is believed to be linked to that of the Higgs'.
"And if we don't find it, it is going to be back to the drawing board for particle physics." link