Baryon

Pair of mesons

I

I3

S

Binding quarks

Binding energy

Mass (MeV) (estimated)

Mass (MeV) (measured)

p+

π + + π 0

1

1

0

uu or d ¯ d ¯

664.02

938.27 (setting)

938.27

p0 (n0)

π + + π

1

0

0

ud or u ¯ d ¯

664.02

943.16

939.57

p

π + π 0

1

−1

0

u ¯ u ¯ or dd

664.02

938.27

Λ0

π + + κ or π + κ +

0

0

0

us or u ¯ s ¯

482.43

1115.68 (setting)

1115.68

Σ+

π + + η 0

1

1

0

us or d ¯ s ¯

482.43

1169.76

1189.37

Σ0

π 0 + η 0

1

0

0

us, ds or u ¯ s ¯ , d ¯ s ¯

482.43

1165.27

1192.64

Σ

π + η 0

1

−1

0

ds or u ¯ s ¯

482.43

1169.76

1197.45

Ξ+

f 0 + κ +

1 2

1 2

1

u ¯ s ¯ , d ¯ s ¯

482.43

1316.61

Ξ

f 0 + κ

1 2

1 2

−1

us, ds

482.43

1316.61

1321.71

Ξ0

f 0 + κ s 0 or f 0 + κ L 0

0

0

0

us, ds or us, ds

482.43

1320.54

1314.86