A dark photon is a hypothetical particle that arises in certain extensions of the Standard Model of particle physics, particularly in theories involving dark matter and hidden sectors. Essentially, a dark photon is a massive vector boson similar to the ordinary photon, but it interacts very weakly with ordinary matter and only couples to the so-called "dark sector" particles. ### Key Features: 1. **Mass**: Unlike the ordinary photon, which is massless, dark photons can have a small mass.
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