Baryons -
(Xi) Particles
| 1st Generation | 2nd Generation | 3rd Generation | |
| "Up" Type Quarks |
Up Quark Mass: 1.87-2.15 MeV Charge: 2/3 Spin: 1/2 ID: u, u |
Charm Quark Mass: 1.18-1.34 GeV Charge: 2/3 Spin: 1/2 ID: c, c |
Top Quark Mass: 172.6-173.6 GeV Charge: 2/3 Spin: 1/2 ID: t, t |
| "Down" Type Quarks |
Down Quark Mass: 4.63-4.95 MeV Charge: -1/3 Spin: 1/2 ID: d, d |
Strange Quark Mass: 90-100 MeV Charge: -1/3 Spin: 1/2 ID: s, s |
Bottom Quark Mass: 4.2 or 4.68 GeV Charge: -1/3 Spin: 1/2 ID: b, b |
Quark Summary (compiled from a number of different sources)
| XiParticle Type | Quark Composition | Rest Mass in MeV |
| Xi | uss dss |
1,314.9 1,321.7 |
| Charmed Xi | usc dsc |
2,467.9 2,471.0 |
| Double Charmed Xi | ucc dcc |
6,054.4 3,518.9 |
| Bottom XI | usb dsb |
Unknown 5,792.9 |
| Double Bottom Xi | ubb, dbb | Unknown |
| Charmed Bottom Xi | ucb,dcb | Unknown |
| Particle Type Click name for more: |
Quark Composition | Rest Mass in MeV |
| Proton | uud | 938.3 |
| Neutron | ddu | 939.6 |
| Lambda Charmed Lambda Bottom Lambda Top Lambda |
uds udc udb udt |
1,115.6 2,281.0 5,620.2 ---------- |
| Sigma | ||
| Delta | uuu, uud, udd, ddd | 1232.0 |
| Xi | ||
| Omega |
(Xi) baryons have one up or down quark plus two heavier quarks. They are unstable, and decay rapidly into lighter particles. Brookhaven National Laboratory first discovered it in 1964. The bottom X, discovered by Fermilab in 2007, was the first particle found with a quark from each of the three quark generations; down, strange and bottom, all of which are down type quarks.
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