Electromagnetic form factors:

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Electromagnetic form factors
Rosenbluth separation
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Proton Recoil Polarization
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Jefferson Lab Hall A
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f
Pt
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New Experiment

• Higher Q2
• Pb-Glass calorimeter
• More spin rotation

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Some Data This Time!
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G. Miller

• Constituent Quark model
• Light Cone coords
• Cloudy bag pion

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Comment on Ralston from Xiangdong Ji
Hi, Bob, We are at the moment exame his claim. I
don't understand his paper, which appears to have
no firm theoretical formalism behind. We have a
much more clean way to proceed, we are using the
usual PQCD approach to get the result. I will let
you know as soon as we find the anwser. If you
have to ask my gut feeling, I say his answer
might be wrong. F_2 is helicity flip, like g_2, a
twist-3. Therefore it does have a Q power
difference from F_1. But this power of Q is
already taken out in the definition. Therefore
F_2 should go like 1/Q6. I hope this helps.
Xiangdong