stunt_muppet

I don't know all the details and I'm mainly talking on memory (meaning there may be errors in there), but to sum things up, Higg's particle should be there because it's the particle which gives bigger particles mass. Also, it's the only particle with a spin of 0 (meaning you basically can't "turn it around" because it never shows the same facies once it's started rotating).

Its existence was postulated at some point in the 20th century (don't remember when) and most of our recent theories require it in order to be true.

But then again, the main problem with Higg's particle is that it's hard to detect by nature (its characteristics make it excessively hard to detect - if I remember correctly it doesn't have a charge and its mass is really small (or is it null?)).

We're pretty sure there *is* something though. When disintegrating stuff, the two "matter parts" we're able to monitor/detect/whatever go two separate ways which are roughly in a 120° angle configuration.
If you think about it a little, you find out that 120x2 only makes 240° - there's an huge hole in this repartition (if we could detect every part of the disintegration it would either spread in a plane (total angle 360°) or in three dimensions (for more than four "matter parts")). This hole must be filled with something else we can't detect as of now (Higg's particle), by the current theory. Because there simply isn't any other reason for this 120° gap from our current theory viewpoint.

... Sorry, too much science (and probably a few errors in it, I'm not a specialist at all).