Upsilon meson

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.

• Quark structure of the Upsilon meson
  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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