German Particle Physics School Maria Laach - Herbstschule Maria ...
German Particle Physics School Maria Laach - Herbstschule Maria ...
German Particle Physics School Maria Laach - Herbstschule Maria ...
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Rho parameter<br />
ρ ≡<br />
Custodial Symmetry<br />
M 2 W<br />
M 2 Z cos2 θw<br />
=<br />
1<br />
4g2 v2 1<br />
4 (g2 + g ′2 )v2 g 2<br />
g 2 +g ′2<br />
Consequence of an approximate global symmetry of the Higgs sector<br />
<br />
+ h<br />
H =<br />
Higgs doublet = 4 real scalar fields<br />
h0 <br />
<br />
V (H) =λ H † H − v2<br />
2<br />
2<br />
SU(2)L<br />
SU(2)R<br />
is invariant under the rotation of the four real components<br />
DRAFT<br />
iσ 2 H ⋆ H = Φ<br />
SO(4) ∼ SU(2)L × SU(2)R<br />
V (H) = λ<br />
2x2 matrix explicitly invariant under<br />
Christophe Grojean Beyond the Standard Model 19<br />
<strong>Maria</strong> <strong>Laach</strong>, Sept. '10<br />
=1<br />
Φ † Φ = H † H<br />
4<br />
1<br />
trΦ † Φ − v 2 2<br />
1<br />
<br />
SU(2)L ! SU(2)R
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