Aug 7, 2016 · According to quantum electrodynamics, the most accurately verified theory in physics, a photon is a single-particle excitation of the free quantum electromagnetic field.

Jan 11, 2012 · What exactly is $p_T$? Is it simply momentum, but with the component parallel to the main beam projected off? Also, why is $p_T$, as opposed to $p$, an important characteristic of a …

Chirality is a fundamental property of a particle; particles which differ in terms of chirality can be viewed as an entirely different type of particle. It refers to how a particle's quantum mechanical wave function …

I know classical physics, quantum mechanics, special relativity, and basic nuclear physics. I would like to get into some particle physics. Where can I find a good introduction? It might be usefu...

In that configuration, the only way to reduce the field energy is to bring the charges closer together, so there is a force in that direction, i.e., of each particle directly toward the other. The energy density of …

Aug 31, 2015 · Why, fundamentally, are particles charged? The answer to this and the similar questions is : because that is what we have observed and defined by measurements with innumerable data. It …

Jun 4, 2017 · A definition of an exchange particle when 2 particles interact bosons are exchanged between the 2 particles creating a force implies that the exchange has to be asymmetrically. Photons …

Dec 21, 2025 · So atoms are formed from protons and neutrons, which are formed from quarks. But where do these quarks come from? What makes them?

Jun 5, 2024 · Spherical shapes in the universe are common because the dominant long range forces like gravity and electromagnetism are central (in that they only depend on the distance between …

Apr 20, 2015 · In a physics of nuclear structure, by the term single particle state is typically understood an excitation, that can be attributed mostly to one proton or one neutron that jumped to a higher orbit.