Baryon number

Quantum number relating the quantity of quarks and antiquarks in a system

In particle physics, the baryon number (B) is an additive quantum number of a system. It is defined as B = 1 3 ( n q − n q ¯) , {\displaystyle B={\frac {1}{3}}(n_{\text{q}}-n_{\rm {\overline {q}}}),} where ⁠ n q {\displaystyle n_{\rm {q}}} ⁠ is the number of quarks, and ⁠ n q ¯ {\displaystyle n_{\rm {\overline {q}}}} ⁠ is the number of antiquarks. Baryons (three quarks) have B = +1, mesons (one quark, one antiquark) have B = 0, and antibaryons (three antiquarks) have B = −1.

From Wikipedia, under CC BY-SA. More on occurri.