On the quark triangle

PHYSICS · Multi-part · Fermi University Physics · Particle Physics & Quantum Fields · Symmetry, groups and the quark model · Symmetry, groups and the quark model

Particle Physics, Ch SU(3) flavour and the hadron multiplets

Problem

On the quark triangle, the

d

quark sits at

(I_3,Y)=(-1/2,1/3)

and the

s

quark sits at

(I_3,Y)=(0,-2/3)

. An antiquark sits at the position obtained by reversing the sign of both coordinates of its quark. A meson's position is the sum of its quark's and antiquark's coordinates. ((a)) Give the position of

\bar s

. ((b)) Build the position of the meson

K^0 = d\bar s

by adding coordinates, and state its

(I_3,Y)

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