Definition of "isospin" []

• A quantum number related to the number of charge states of a baryon or meson. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Technically, these are referred to as isospin-1 / 2 bosons, but theoretically there is little difference between spin and isospin, "explains RIKEN's Akira Furusaki who, along with Konstantin Matveev from Argonne, built the theory to describe how such particles interact1."
• "We can quantify them without significantly affecting the fermions and isospin quantum numbers."
• "Are the x, y, and z axes only an isospin basis, or do they have actual directions in a physical frame?"