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
Asymptotic Freedom Vs Confinement? | Particle Physics | Problems
Problem – How asymptotic freedom is different from confinement?
Solution
Asymptotic Freedom
In QCD, coupling constant
$\alpha_{s}$ > 1 (strong coupling constant)
But $\alpha_{s}$ is a running coupling constant (i.e. not always a constant). It is because $\alpha_{s}$ becomes small as we move toward smaller distances.
And the quarks at a shorter level behave as “free quarks” and we reach to the regime of “asymptotic freedom”.
Confinement
On the other side, when we reach at the level of baryon size coupling constant become stronger and quarks gets confined in colorless mesons and baryons called “quarks confinement or color confinement”.
