Bottom ScienceParticle Physics
Introduction
- Introduction to Particle Physics
- Need of High Energy Physics
- Four Fundamental Forces
- Units in High Energy Physics
- Natural System of Units
- Particle Accelerators & Types
- 1st, 2nd, and 3rd Generation Particles
- Center of Mass Frame vs. Laboratory Frame
- Gravitational vs Nuclear Binding Energy (Mass Defect)
Invariance Principles & Conservation Laws
- Symmetries & Conservation Laws
- Continuous Transformations
- Discrete Transformation
- Parity Transformation
- Wu’s Experiment & Parity Violation
- Feynman Rules for Quantum Electrodynamics (QED)
- Electron-Muon Scattering Amplitude (M) Calculation
- Electron-Positron Scattering Amplitude (M) Calculation
- SU(1), SU(2), SU(3) – Unitary Groups (QCD)
- More topics coming soon…
Problems
Why gluons are massless? | Particle Physics | Problems
Problem – Why gluons are Massless?
Solution
We know, that photons are massless and provide long-range of force, but gluons interact with each other instead of spreading the effect in all directions, gluons tend to stick together and form strings (i.e. 2 quarks stick together by a string).
And, the effect of force between quarks doesn’t weaken with distance but remains constant approximately.
Hence gluons need not to be massive to act as mediator for short-range forces.
