Sigma Particle Type Quark Composition Rest Mass
in MeV
Sigma uus
uds
dds           		1,189.4
1,192.5
1,197.3
Charmed Sigma uuc
udc
ddc           		2,454.0
2,452.9
2,453.8
Bottom Sigma uub
udb
ddb           		5,807.8
Unknown
5,815.2
Top Sigma uut, udt, ddt ----------
The family of sigma baryons.  The mass of one of the bottom sigma particles (udb) has yet to be determined.  Considering the instability of the top quark, it is highly unlikely that the top sigmas will be identified, though they are predicted by theory. 
Quark Summary
  1st Generation 2nd Generation 3rd Generation
"Up"
Type Quarks		 Up Quark
Mass:    1.5-4.0 MeV
Charge: 2/3
Spin:     1/2
ID:            u, u		 Charm Quark
Mass:    1.16-1.5 GeV
Charge: 2/3
Spin:     1/2
ID:            c, c		 Top Quark
Mass:    171-176 GeV
Charge: 2/3
Spin:     1/2
ID:            t, t
"Down" Type Quarks
 Down Quark
Mass:    3.5-8.0 MeV
Charge: -1/3
Spin:     1/2
ID:            d, d		 Strange Quark
Mass:    70-150 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
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    

Baryons - Sigma  Particles

Physics

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Composite Particles
Deborah & William Hillyard
Deborah & William Hillyard
Deborah & William Hillyard
Deborah & William Hillyard
Deborah & William Hillyard
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