Baryon number is the number of baryons minus the number of antibiotic
The barium number is a preserved quantity. If two protons collide at high energies, that may lead to, for example, three protons and one proton (barium number remains two) but never up to two protons and a neutron (baryon number two goes into baryon number three). The barium number before and after the reaction remains the same. Because baryons consist of three quarks, it can be said that the baryon number for a quark is 1/3. For an antiquark it is -1/3.
Mesons have a barium number of 0 because they consist of a quark and an anti-quark.
It has never been observed that the barium number changes. If the lightest baryon, the proton, expires, this means that the baryngetal can change. The proton half-life is in any case longer than 10 years. By comparison, the age of the universe is at one percent after 1.37 × 10 years.
The universe barium number is estimated at 10.
The preservation of the baryon number was proposed by Ernest Stueckelberg in 1938 as a greatness that is always maintained in particle interactions. This explains why the proton can not expire. Externe link
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