UPSILON PARTICLE

(Redirected from Upsilon meson)

The 'upsilon particle' ($Upsilon,$) 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.

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See also

References

See also

★ Oops-Leon, an erroneously-claimed discovery of a similar particle at a lower mass in 1976.

★ Quarkonium, the general name for mesons formed from a quark and the corresponding antiquark.

★ The J/ψ particle is the analogous state made from charm quarks.

★ List of mesons

References

# Observation of a Dimuon Resonance at 9.5 Gev in 400-GeV Proton-Nucleus Collisions, Hom, D.C., et al., , , Phys. Rev. Lett., 1977
# The Discovery of the ''b'' Quark at Fermilab in 1977: The Experiment Coordinator's Story, Yoh, John, , , AIP Conf. Proc., 1998
# Technical data (pdf file) from Particle Data Group (From 2005 update of Review of Particle Physics, S. Eidelman et al., , , Phys. Lett. B, 2004 )