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),

Σ⁺⁺
_c (uuc),
Σ⁺
_c (udc),
Σ⁰
_c (ddc),

Σ⁺
_b (uub),
Σ⁰
_b (udb),
Σ⁻
_b (ddb)

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)