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Form factor (quantum field theory)
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<p>In elementary <a href="/facts/Particle_physics/YgIuyj2t">particle physics</a> and <a href="/facts/Mathematical_physics/sLKg8T1G">mathematical physics</a>, in particular in <a href="/facts/Effective_field_theory/oQ2nWoko">effective field theory</a>, a form factor is a <a href="/facts/Function_(mathematics)/CdReEKCh">function</a> that encapsulates the properties of a certain <a href="/facts/Fundamental_interaction/WrFEJaFl">particle interaction</a> without including all of the underlying <a href="/facts/Physics/a7aH2y08">physics</a>, but instead, providing the momentum dependence of suitable matrix elements. It is further measured experimentally in confirmation or specification of a theory—see <a href="/facts/Experimental_particle_physics/YgIuyj2t">experimental particle physics</a>. </p>