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The sigma probabilities for the Higgs hunt in the ATLAS experiment is 2.8 sigma and in the case of CMS experiment 1.9 sigma (where three sigma level of certainty means nearly 99% accurate result).

Why it is called God Particle:

Higgs boson is often referred to as the “God particle” by the media. This name was bestowed by the Nobel Prize winning Physicist Dr. Leon Lederman in his book “The God Particle: If the Universe Is the Answer, What is the Question?” written with Dick Teresi.

Dr. Ledermen chose this name as he felt the particle was “so central to the state of physics today, so crucial to our final understanding of the structure of matter, yet so elusive.”

Most physicists, including Peter Higgs himself, do not like this name as it is grandiose and overstates the implications of the research.