Solutions Manual for Particle Physics at the New Millennium by Byron P. Roe

(J 1 . (J 2) = 1. 52 6. 0152 . 0153. 2. 3. 3 11ass Difference Calculations Mass diff. 1 In Chapter 6, the concept of V-spin was introduced. If the u, d, and s quarks are taken as equivalent, the I-spin operator /+ can be viewed as changing a d quark to a u quark, and the V-spin operator U+ can be viewed as changing an s quark to a d quark. /- and U- change quarks in the opposite direction from /+ and U+, respectively. , atad, where the operators are understood to be for the same momentum and spin.