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Weak force carriers, W+, Z°, W- have spin 1

Weak force carriers, W+, Z°, W- have spin 1

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Now work out how much beam energy is needed in the lab:<br />

4<br />

lab<br />

CMS<br />

TRICK: length 2 of a 4 vector is invariant!!!<br />

P<br />

( P′<br />

)<br />

2 2<br />

=<br />

2 2 2<br />

⇒ p − ( E+ M) = −( E*)<br />

for m

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