Tracking the Higgs

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S - University of California, Santa Barbara

• Universal Coupling G F

Weak Force

Weak Nuclear Force


Hints of SU(2) gauge symmetry


• Doublets

But short-ranged ⇒ massive gauge quanta


Interactions only observed over short distances (effectively contact interactions)


• Coupling G F

~ 1/M 2

– How to reconcile ?

An example from Nature: Superconductivity

• µ = (−q 2 /m) ⏐ψ⏐ 2 A µ (London)

j

∂ µ ∂ µ Α ν - ∂ ν (∂ µ Α µ ) = (−q 2 /m)⏐ψ⏐ 2 A ν ≡−M 2 A ν

pair (boson) wavefunction ψ with non-zero constant ground state

Cooper

massive photon!


Supercurrents screen the EM field making it effectively short-range

∴Massive gauge quanta are possible when gauge symmetry is broken!

u

c

t

d

s

b

High Energy Physics

Graduate Seminar at UCSB, March 3, 2006 J.Incandela, UC Santa Barbara 4

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