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Georg Raffelt, Max-Planck-Institut für Physik, München, Germany<br />
The CP Problem of Strong Interactions<br />
PONT d‘Avignon, 21-25 April 2008, Avignon, France<br />
Characterizes degenerate<br />
QCD ground state (Θ(<br />
vacuum)<br />
Phase of Quark<br />
Mass Matrix<br />
Standard<br />
QCD Lagrangian<br />
contains<br />
a CP violating term<br />
L<br />
CP<br />
α<br />
= −<br />
s<br />
(<br />
Θ −<br />
arg det M<br />
) Tr G ~<br />
q μν<br />
G<br />
8<br />
π<br />
14 4<br />
2<br />
4 4<br />
3<br />
0<br />
≤Θ≤<br />
2<br />
π<br />
μν<br />
Induces a neutron<br />
electric dipole moment<br />
(EDM) much in excess<br />
of experimental limits<br />
d<br />
n<br />
≈<br />
Θ<br />
10<br />
−<br />
16<br />
e cm<br />
≈<br />
Θ<br />
10<br />
2<br />
μ<br />
n<br />
<<br />
3<br />
×<br />
10<br />
−<br />
26<br />
e<br />
cm<br />
Θ<br />
≲<br />
10 −10<br />
Why so small
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