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Could you please explain me this question. As we know that every field has a source like electric field has electric charge and magnetic field has magnet etc. So what is the source of the Higgs field?

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    $\begingroup$ The sources for the Higgs field are the rest of fields in the Standard Model, such as the electron field, the $Z$ field, etc. $\endgroup$ – AccidentalFourierTransform Apr 1 '17 at 13:15
  • $\begingroup$ @AccidentalFourierTransform Could you elaborate? $\endgroup$ – Helen Apr 2 '17 at 4:08
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The Higgs particle is an elementary particle in the standard model of particle physics

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All elementary particles have a meaning in the quantum mechanical framework, not the classical that you are discussing.

In quantum field theory, every particle in the table above is a quantized field which covers all spacetime. Creation and annihilation operators define the sources , for example a creation operator creates an electron, acting on the electron field, or a Higgs particle creation operator acting on the Higgs field creates a Higgs meson.

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Good question. The Lagrangian of the Standard Model of physics is constructed in such a way that the standard answer to your question is: the Higgs field itself. This is because it contains a huge self-interaction term $\lambda\phi^4$ that causes the ground state of the Higgs to correspond to a constant nonzero value. However, the existence of such a term has not yet been established experimentally and there are other possible explanations for the Higgs vacuum expectation value (which definitely IS established) that do not involve self-interaction.

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