User talk:Vectorboson
welcome! Count Iblis (talk) 23:44, 1 May 2008 (UTC)
"LIST OF BARYONS" SECTION UNDER CONSTRUCTION:
Relation between isospin and up and down quark content
The third component of isospin for the up quark is 1⁄2, for the down quark it is - 1⁄2, and it is zero for the other quarks. The third component of isospin for a baryon is simply the sum of that of its quarks. Different baryons that have the same constituent quarks are distinguishable by their other characteristics (like spin).
Particles of isospin 3⁄2 can only be made by a mixture of three u and d quarks (Δs):
The four
Δ
s are:
Δ++
(uuu) with Iz = 3⁄2
Δ+
(uud) with Iz = 1⁄2
Δ0
(udd) with Iz = - 1⁄2
Δ−
(ddd) with Iz = - 3⁄2
- Particles of isospin 1 are made of one c, s, or b quark together with two u quarks or two d quarks or a u and a d quark (Σs).
The nine
Σ
s are:
Σ+
(uus),
Σ0
(uds),
Σ+
(dds), with Iz being +1, 0, -1 respectively
Σ++
c (uuc),
Σ+
c (udc),
Σ0
c (ddc), with Iz being +1, 0, -1 respectively
Σ+
b (uub),
Σ0
b (udb),
Σ−
b (ddb) with Iz being +1, 0, -1 respectively
- Particles of isospin 1⁄2 can be made of two u quarks and one d quark, or two d quarks and one u quark (Ns).
The two
N
s are:
p+
(uud),
n0
(udd)
They can also be made of a combination of two c, s, or b quarks together with one u or d quark (Ξs).
The twelve
Ξ
s are:
Ξ0
(uss),
Ξ−
(dss),
Ξ+
c (usc),
Ξ0
c (dsc),
Ξ++
cc (ucc),
Ξ+
cc (dcc),
Ξ0
b (usb),
Ξ−
b (dsb),
Ξ+
cb (ucb),
Ξ0
cb (dcb),
Ξ0
bb (ubb),
Ξ−
bb (dbb)
Particles of isospin 0 can be made two unaligned u and d quarks (Λs), or of no u or d quarks at all (Ωs):
- The three
Λ
s are:
Λ0
(uds),
Λ+
c (udc),
Λ0
b (udb)
- The ten
Ω
s are:
Ω−
(sss),
Ω0
c (ssc),
Ω+
cc (scc),
Ω−
b (ssb),
Ω0
cb (scb),
Ω−
bb (sbb)
Ω++
ccc (ccc},
Ω+
ccb (ccb),
Ω0
cbb (cbb),
Ω−
bbb (bbb)