The detection of spin in Hadrons and Leptons is done through magnetism, a spin 1/2 particle has two states in a magnetic field, an up particle goes up, a down particle goes down. A spin 1 particle has three states, an up/up goes up, a up/down stays straight and a down/down goes down. A spin 3/2 particle has 4 states, the up/up/up goes up a lot, the up/up/down goes up a bit, the up/down/down goes down a bit, a down/down/down particle goes down a lot. What about the bosons? Wiki says the higgs is a 0 spin particle and the z/w/photon particles are spin 1. Is this just theory or has it been experimentally shown? Photons don't react to a magnetic field so what does it mean experimentally, what do people see? How can people be so sure that a z-particle is spin 1? Are there specific effects that can be measured that show this?