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
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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. 
Physics

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Composite Particles
WILLIAM & DEBORAH HILLYARD
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