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<p>The Higgs boson plays a unique role in the Standard Model, by explaining why the other elementary particles, except the <a href="page.php?w=photon">photon</a> and <a href="page.php?w=gluon">gluon</a>, are massive. In particular, the Higgs boson explains why the photon has no mass, while the <a href="page.php?w=W_and_Z_bosons">W and Z bosons</a> are very heavy. Elementary-particle masses and the differences between <a href="page.php?w=electromagnetism">electromagnetism</a> (mediated by the photon) and the <a href="page.php?w=weak_force">weak force</a></p><p>
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