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In the standard model gravitron is a particle but Higgs boson is not? 
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#19
Jun2114, 07:51 PM

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The Z couples to quarks, and quarks have charge, so on looplevel, you get photon/Z interactions as well (not sure how/if they might cancel out).
Pair production at a Z would be... let's call it exotic :D. For the neutron, if the energy is low the quark charges are practically invisible because they cancel out nearly exactly then. MultiGeV photons don't care about the hadronic structure and scatter at the partons. 


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