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<p>(EWT).</p>

<p>The effective range of the weak force is limited to subatomic distances and is less than the diameter of a proton.</p>

<p><big> Background </big></p>
<p>The <a href="page.php?w=Standard_Model">Standard Model</a> of <a href="page.php?w=particle_physics">particle physics</a> provides a uniform framework for understanding electromagnetic, weak, and strong interactions. An interaction occurs when two particles (typically, but not necessarily, <a href="page.php?w=half-integer">half-integer</a> <a href="page.php?w=Spin_%28physics%29">spin</a> <a href="page.php?w=fermion">fermion</a>s)</p><p>
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