1303_Physics ProblemsTechnical Physics

1303_Physics ProblemsTechnical Physics - 644 P46.65...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
644 Particle Physics and Cosmology P46.65 (a) The mediator of this weak interaction is a Z bo son 0 . (b) The Feynman diagram shows a down quark and its antiparticle annihilating each other. They can produce a particle carrying energy, momentum, and angular momentum, but zero charge, zero baryon number, and, it may be, no color charge. In this case the product particle is a photon . FIG. P46.65 For conservation of both energy and momentum in the collision we would expect two photons; but momentum need not be strictly conserved, according to the uncertainty principle, if the photon travels a sufficiently short distance before producing another matter- antimatter pair of particles, as shown in Figure P46.65. Depending on the color charges of the d and d quarks, the ephemeral particle could also be a
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Ask a homework question - tutors are online