During recombination, the Compton scattering rate is given by the product of the free electron fract
During recombination, the Compton scattering rate is given by the product of the free electron fraction, the Thomson cross section, and the total amount of this quantity in the universe. Certain GUTS postulate the existence of X bosons which violate the conservation of this quantity, whose non-conservation is the first of the Sakharov conditions. In the Eightfold Way classification scheme, the hypercharge is formed from the sum of strangeness and this quantity. Multiple grand unification theories predict the occurrence of proton decay, which would violate the symmetry of this quantity's conservation. Every quark carries a value of 1/3 for this quantity, and particles like the proton and neutron have a value of 1 for this quantity. For 10 points, identify this quantum number which is 1 for any three-quark hadron.
During recombination, the Compton scattering rate is given by the product of the free electron fraction, the Thomson cross section, and the total amount of this quantity in the universe.
baryon number 