Upsilon particle

Upsilon ( $\Upsilon\,$ )
A plot of the invariant mass of muon pairs, from the Upsilon particle discovery paper. The peak at about 9.5 GeV represents the particle itself.
Composition:	Composite: C
Spin:	1

The Upsilon seconds and a mass about 10 GeV.

See also

Oops-Leon, an erroneously-claimed discovery of a similar particle at a lower mass in 1976.
quark and the corresponding antiquark.
The charm quarks.
List of mesons

References

Hom, D.C., et al. (1977). "Observation of a Dimuon Resonance at 9.5 Gev in 400-GeV Proton-Nucleus Collisions". Phys. Rev. Lett. 39: 252-255.
Yoh, John (1998). "The Discovery of the b Quark at Fermilab in 1977: The Experiment Coordinator's Story". AIP Conf. Proc. 424: 29-42.
Technical data (pdf file) from Particle Data Group (From 2005 update of S. Eidelman et al. (2004). "Review of Particle Physics". Phys. Lett. B 592: 1.)

v • d • e
Polaron

Mesons

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.