News from the ILC Barry Barish Users’ Meeting Fermilab 9-June-05 Why e+e- Collisions? • elementary particles • well-defined – energy, – angular momentum • uses full COM energy • produces.

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Transcript News from the ILC Barry Barish Users’ Meeting Fermilab 9-June-05 Why e+e- Collisions? • elementary particles • well-defined – energy, – angular momentum • uses full COM energy • produces.