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Comment: It is a very large particle

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In reply to comment: Around 126Gev in the mass (see in situ)

It is a very large particle

Not sure if you are being serious or not, pardon my explanation if so. Mass is energy. Particles of the Standard Model are measured in terms of energy rather than mass for two reasons:

1) It doesn't make sense to quote particle masses in something almost meaningless like yoctograms. Alternatively, you could choose one common particle and measure everything relative to that, however the difference between the lightest and heaviest elemental particles is about 1:250,000 so it's quite a spread.

2) Stating particle masses in terms of energy is convenient because it is an indication of how much energy you need to feed to the colliding particles to create them.

If the Higgs Boson is 126GeV, then at the bare minimum you would need to accelerate two colliding particles with 63GeV each to create one which can be detected. Typically, you need much more than just 1/2 the energy each though. The particle they've discovered weighs, by itself, as much as an entire atom of Xenon (54 protons, 54 electrons, 77 neutrons)!

Sigma 5 is a confidence interval. The higher the Sigma value, the more certain they are that the results aren't due to chance. A value of 5 means they are 99.99994% certain it's a real result. Note that even with that confidence, they are still not definitively calling this particle the Higgs. Give them credit for that.