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Bottomonium
In high energy physics, a bottomonium is any of the flavorless, heavy mesons that are composed by a bottom quark and an anti-bottom quark. There are several bottomonium states depending on their quantum numbers.
List of some bottomonium states
In the following table, the same particle can be named with the spectroscopic notation or with its mass.
Some of the states are predicted, but have not been identified; others are unconfirmed.
| Term symbol | IG(JPC) | Particle | mass (MeV) |
|---|---|---|---|
| 11S0 | 0+(0−+) | ηb (1S)* | 9300±20 |
| 13S1 | 0−(1−−) | Υ (1S) | 9460.3 |
| 11P1 | 0−(1+−) | hb (1P) | |
| 13P0 | 0+(0++) | χb0 (1P) | 9859.0±1.0 |
| 13P1 | 0+(1++) | χb1(1P) | 9892.7 |
| 13P2 | 0+(2++) | χb2(1P) | 9912.6 |
| 21S0 | 0+(0−+) | ηb(2S) | |
| 23S1 | 0−(1−−) | Υ(2S) | 10023.26 |
| 11D2 | 0+(2−+) | ηb2(1D) | |
| 13D1 | 0−(1−−) | Υ(1D) | |
| 13D2 | 0−(2−−) | Υ2(1D) | |
| 13D3 | 0−(3−−) | Υ3(1D) | |
| 21P1 | 0−(1+−) | hb(2P) | |
| 23P0 | 0+(0++) | χb0(2P) | 10 232.1 |
| 23P1 | 0+(1++) | χb1(2P) | 10 255.2 |
| 23P2 | 0+(2++) | χb2(2P) | 10 268.5 |
| 33S1 | 0−(1−−) | Υ(3S) | 10 355.2 |
| 43S1 | 0−(1−−) | Υ(4S) or Υ(10580) | 10 580.0 |
| 53S1 | 0−(1−−) | Υ(10860) | 10 865 |
| 63S1 | 0−(1−−) | Υ(11020) | 11 0219 |
Notes:
- * Preliminary results. Confirmation needed.
External links
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details