Weinberg angle
Angle characterizing electroweak symmetry breaking / From Wikipedia, the free encyclopedia
The weak mixing angle or Weinberg angle[2] is a parameter in the Weinberg–Salam theory of the electroweak interaction, part of the Standard Model of particle physics, and is usually denoted as θW. It is the angle by which spontaneous symmetry breaking rotates the original
W0
and
B0
vector boson plane, producing as a result the
Z0
boson, and the photon.[3] Its measured value is slightly below 30°, but also varies, very slightly increasing, depending on how high the relative momentum of the particles involved in the interaction is that the angle is used for.[4]