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Applications of Light-Front Dynamics in Hadron Physics 1. What is ...

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!<br />

Angular Momentum<br />

[J i ,J j ] = i" ijk<br />

J k ,[J i ,M] = 0<br />

{ }<br />

T = Exp "i(# ˆ<br />

1<br />

$<br />

1 + # ˆ<br />

2<br />

$ 2 )<br />

[" ˆ i ," ˆ j ] = i# " ˆ k , [" ˆ i , M] = 0<br />

ijk<br />

!<br />

T | n >=| p,n ><br />

ˆ " i | p,n >= TJ i | n ><br />

!<br />

" ˆ i = TJ i T +

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