Update on the blog post of Friday, January 11, 2013
Shortly after the discovery of the Higgs Boson two years ago, physicists suspected that a new particle lurked in the data (new particles such as this could lead to an explanation for dark matter).
The Higgs Boson is unstable and rapidly decays into other particles. It does so through several different "channels", one is the gamma gamma channel where the Higgs Boson decays into two gamma particles. This decay cannot occur in one step, it must occur through intermediate particles. The percentage of decays that goes through each decay is called the yield. The yield in turn is based on the available particles. If there are unknown particles available, this will affect the yield.
There was an anomoly in the yield of the gamma gamma channel (the yield was higher than expected) which suggested the existance of a previously undiscovered particle or particles. Such particles might be the components of dark matter.
However based on more careful analysis, this anomoly has disappeared and now there is no suggestion of additional particles.
That doesn't rule out future experiments finding new particles. The LHC (Large Hadron Collider) where the Higgs Boson was discovered is currently undergoing renovations. It will restart at higher energy in 2015. When it restarts, it will be looking for new particles as well as exploring the properties of existing particles, especially the Higgs Boson.
For more information see: https://www.sciencenews.org/editors-picks/higgs-boson (to read the entire article requires a subscription to Science News).
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