A particle in the Standard Model table meets the photon

PHYSICS · Multi-part · Fermi University Physics · Particle Physics & Quantum Fields · Electroweak theory and the Standard Model · Electroweak theory and the Standard Model

Particle Physics, Ch The Standard Model as a table you can predict from

Problem

A particle in the Standard Model table meets the photon, the

W^\pm

and the

Z

at a vertex but never the gluon; it carries electric charge

-1

, belongs to the third generation of fermions, and has a mass of

1776.9\,\mathrm{MeV}/c^2

. ((a)) Name the particle. ((b)) State whether the two-body decay

X \to e^-\gamma

is permitted by its vertices, and identify the conservation law that decides the answer.

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