Note on Charmed Baryons - Particle Data Group

Charmed baryon mass (GeV)
2.9
2.7
2.5
2.3
3/2 –
1/2 –
1/2 +
ππ
3/2 +
1/2 +
π
3/2 +
1/2 +
1/2 +
1/2 +
–2–
(a) Charmed baryons (b) Light strange baryons
π
π
3/2 –
1/2 –
π
γ
π
π
0.6
0.4
0.2
0.0
Mass above baseline (GeV)
Λ c Σ c Ξ c Ω c Λ Σ Ξ Ω
Figure 1. (a) The known charmed baryons, and (b) the
lightest strange baryons. Isospin splittings are not shown, and
the only transitions shown are those between the charmed
baryons. <strong>Note</strong> that there are two J P =1/2 + Ξc states, and
that the Ωc does not have J =3/2. Actually, none of the
J P values of the charmed baryons has been measured (except
perhaps for the 1/2 + Λc), but they are all very likely as shown—
see the discussion.
0.6
0.4
0.2
0.0
3/2 –
1/2 –
1/2 +
November 12, 2001 14:51
3/2 +
1/2 +
3/2 –
3/2 +
1/2 +
3/2 +
1.8
1.6
1.4
1.2
Strange baryon mass (GeV)