Axion

Georg Raffelt, Max-Planck-Institut für Physik, München, Germany
Axion Properties
PONT d‘Avignon, 21-25 April 2008, Avignon, France
Gluon coupling
(Generic property)
Mass
Photon coupling
Pion coupling
Nucleon coupling
(axial vector)
Electron coupling
(optional)
L
m
L
g
L
L
L
aG
a
a
a
α
= s
GG ~
a
a
8
π
f
=
f
a
a
0.6 eV
/10
7
GeV
C
= N
Ψ
N
γμ
γ
2f
m
f
≈
π
f
Ψ
∂
aN 5 N
μ
a
C
= e
Ψ
e
γ
μ
γ
2f
Ψ
∂
a
a
ae 5 e
μ
a
π
g
a
γ
FF ~ r r
γ = − a
=
g
a
γ
E
⋅
Baa
4
α
⎛
E
⎞
γ =
⎜
−
1.
92
⎟ 2
π
f
⎝
N
⎠ a
π
a
C
=
a
π
(
π
0
π
+
∂
−
...)
μ
μπ
+ ∂
a
f
f
a
π
a
a
a
a
π
π
G
G
γ
γ
π
a
N
N
e
e