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<a accesskey="3" href="page.php?w=baryon_number&amp;p=2">3.Next</a>
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<p>In <a href="page.php?w=particle_physics">particle physics</a>, the <b>baryon number</b> (B) is an  additive <a href="page.php?w=quantum_number">quantum number</a> of a <a href="page.php?w=Quantum_mechanics">system</a>. It is defined as</p>

<p>where  is the number of <a href="page.php?w=quark">quark</a>s, and  is the number of <a href="page.php?w=antiquark">antiquark</a>s. <a href="page.php?w=Baryon">Baryon</a>s (three quarks) have B = +1, <a href="page.php?w=meson">meson</a>s (one quark, one antiquark) have B = 0, and antibaryons (three antiquarks)</p><p>
<a accesskey="3" href="page.php?w=baryon_number&amp;p=2">3.Next</a>
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