出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/05/02 03:01 UTC 版)
The Upsilon meson (ϒ) 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 1.21×10−20 s and a mass about 9.46 GeV/c2.
| ・upsilon meson | |
| ・N.F. | |
| ・Jukebox Musical | |
| ・appareled | |
| ・Cooch | |
| ・Vitus | |
| ・Bring down | |
| ・Domo | |
| ・Raiders | |
| ・Let Us |