[MAP] Born in a B field.

alex dragt dragtnb at comcast.net
Tue Mar 15 03:40:37 EDT 2011


Dear Kirk,

It occurs to me if muons are born in a magnetic field, say from pion  
or K decay in a solenoid and/or a magnetic horn, then the presence of  
this field (its associated vector potential) may have to be taken into  
account.  For an analogy, it is known that when electrons are born in  
a magnetic field (from a photocathode immersed in a magnetic field),  
the associated vector potential must be taken into account.  Although  
not yet widely appreciated from this perspective, it is the effect of  
the vector potential, coupled with the invariance of eigen emittances,  
that lies behind the flat beam transformer.  See the preprint

arXiv:1010.1558v2 [physics.acc-ph]

Best,

Alex
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