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An italic capital B, one third per quark.
Also known as: Baryon number, B quantum number, Baryonic charge
Baryon number counts quarks in thirds, so a proton has baryon number one and each of its three quarks has one third. It appears to be conserved in every process ever observed, and the fact that the universe contains any matter at all requires that it was violated at least once.
Denotes baryon number, assigned one third to each quark and minus one third to each antiquark.
Contexts: Laboratory
Is conserved in every interaction so far observed, which is why the proton has never been seen to decay.
Contexts: Laboratory
Must have been violated in the early universe for matter to outnumber antimatter, which is an unresolved problem rather than an established mechanism.
Contexts: Laboratory
An italic capital letter B, a vertical stroke with two stacked bowls to its right.