Vol 3 - Landau, Lifshitz - Quantum mechanics - non-relativistic theory (3ed., 1991) · Problem 54.1

Spin

Physics — Landau & Lifshitz · spin-projection-probability

Problem

A particle with spin

\frac{1}{2}

is in a state with a definite value

s_z = \frac{1}{2}

. Determine the probabilities of the possible values of the component of the spin along an axis

z'

at an angle

\theta

to the

z

-axis.