In particle physics, the hypercharge (a portmanteau of hyperonic and charge) Y of a particle is a quantum number conserved under the strong interaction. The concept of hypercharge provides a single charge operator that accounts for properties of isospin, electric charge, and flavour.

What do you mean by hypercharge?

: a quantum characteristic of a group of subatomic particles governed by the strong force that is related to strangeness and is represented by a number equal to twice the average value of the electric charge of the group.

What is isospin and hypercharge?

The weak isospin of a particle describes how it transforms under SU(2), while its hypercharge describes how it transforms under U(1). The electric charge is computed in a funny way from these two! ... Dividing this by i we get a self-adjoint operator called hypercharge, Y . In short: Y = dρ( 1 3 ).