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The Upsilon particle () is a flavorless meson formed from a bottom quark and its antiparticle. It was discovered by the E288 collaboration, headed by Leon Lederman, at Fermilab in 1977, and was the first particle containing a bottom quark to be discovered because it is the lightest that can be produced without additional massive particles. It has a lifetime of 1.21x10-20 seconds and a mass about 10 GeV.
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|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Upsilon_particle". A list of authors is available in Wikipedia.