In particle physics, isoscalar refers to the scalar transformation of a particle or field under the SU(2) group of isospin.
[1] Isoscalars are a singlet state, with total isospin 0 and the third component of isospin 0, much like a singlet state in a 2-particle addition of spin.
Mesons which have all flavor quantum numbers equal to zero, are known as isoscalars.
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