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QED model explores virtual pair creation dynamics in a strong field, indicating new insights on parton saturation.
Virtual pair creation in a strong, virtual, bremsstrahlung field is considered in QED as a model for parton saturation. In a weak field the virtual pair density increases quadratically in the external field; however, at large values of the field the number density becomes independent of the strength of that field. A similar effect is found in scalar electrodynamics.
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A.H. Mueller (1988) studied this question.
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