The number of particles per unit area per time, multiplied by the opacity of the target (its impenetrability) to electromagnetic radiation.
Luminosity is measured in barns per second: b-1s-1
Luminosity is an important measure of the performance of a particle accelerator.
The quantity of matter that a body contains, as measured by its acceleration under a given force or by the force exerted on it by a gravitational field. Do not confuse with weight.
"Has mass" – the opposite of "massless". Does not mean "is large".
Though the up quark is a massive particle, it is not very big.
Measure of radiation dose; symbol mSv
See sievert
A subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
The spontaneous process of one fundamental particle transforming into other fundamental particles. During this process, a fundamental particle becomes a different particle with less mass and an intermediate particle is created. For example, a W boson can decay into a tau and a neutrino. The intermediate particle then transforms into other particles.
