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In particle physics, the X charge is a conserved quantum number associated with the SO grand unification theory. It is thought to be conserved in strong, weak, electromagnetic, gravitational, and Higgs interactions. Because the X charge is related to the weak hypercharge, it varies depending on the helicity of a particle. For example, a left-handed quark has an X charge of +1, whereas a right-handed quark can have either an X charge of −1 , or −3.
X is related to the difference between the baryon number B and the lepton number L , and the weak hypercharge YW via the relation:
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