Upsilon meson
Template:Short description Template:Infobox particle
The Upsilon meson (Template:SubatomicParticle) is a quarkonium state (i.e. flavourless meson) formed from a bottom quark and its antiparticle. It was discovered by the E288 experiment team, 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 Template:Val and a mass about Template:Val in the ground state.
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Quark structure of the Upsilon meson
See also
- Oops-Leon, an erroneously-claimed discovery of a similar particle at a lower mass in 1976.
- The Template:SubatomicParticle particle is the analogous state made from strange quarks.
- The Template:SubatomicParticle particle is the analogous state made from charm quarks.
- List of mesons
References
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