Introduction to Feynman Diagrams

By -

  Table of contents 

INTRODUCTION 

TO 

FEYNMAN DIAGRAMS


View my previous article here -

View the next article here -

-----------------------------------------

Feynman diagrams are diagrams that are used to show the interaction among particles. 

For e.g., if we had to show the beta minus decay using the Feynman diagram -
( In beta minus decay - a neutron decays to proton and in the process, creates an electron and an electron antineutrino.)



Explanation -
  • First, we draw the path of the neutron, which is represented at the bottom left of the image. "u" represents the up quark and "d" represents the down quark.
  • Next, we draw the squiggly line, to show the weak interaction during beta decay. The path shown on the top left shows that of a proton which is a product of beta decay. We also understand that only one of the down quark changes to an up quark.
  • On the top right, we notice an electron emerging, which has been denoted by e-.
  • We also see an electron antineutrino whose direction has been denoted towards the squiggly line since it is "anti".
Similarly, we can draw Feynman diagrams for several such interactions. The squiggly line is used to show the interaction between particles.

Do not miss this article to know more about Feynman diagrams! 

-----------------------------------------

View the next article here -

View my previous article here -

View a more structured order of the articles here -

-----------------------------------------

Feel free to ask/share anything additional in the comments section!

I am still learning Particle physics, but will try my best to answer your questions :)

Kindly let me know about any errors here.

You can also share anything additional for this article here.

View my previous article here -

View the next article here -

View a more structured order of the articles here -

See more articles here -

Solve brain teasers! View my other blog here-

With Warm Wishes,
Lavanya

Comments

Post a Comment

Popular posts from this blog

What are Quarks, Leptons and Bosons?

By -
    Table of contents  WHAT ARE  QUARKS, LEPTONS  AND  BOSONS? View my previous article here - How were Neutrinos Discovered? View the next article here - The Fundamental Forces ----------------------------------------- Here is a brief overview of what are quarks, leptons and bosons - families of particles that make up the Standard Model! (Based on what has been discussed so far).  * ADDITIONAL * -  A fermion is any particle that has an odd half-integer (like 1/2, 3/2, and so forth) spin.  Quarks  and  leptons , as well as most composite particles, like  protons  and  neutrons , are fermions. QUARKS: Quarks are subatomic particles that are found in protons and neutrons in the atomic nucleus. There are 6 quarks .  Up quark and Down quark belong to the first generation. Charm quark and Strange quark belong to the second generation. Top quark and Bottom quark belong to the third generation. The second and third generation particles are more massive and unstable when compared to the
Read more

Particle Physics - Introduction

By -
Table of contents   PARTICLE PHYSICS - INTRODUCTION View the next article here - More on Particle Physics and Why it matters? ----------------------------------------- What is Particle physics? Let me give a hint by telling you what particles are? Everything in our universe is made up of extremely small components known as particles. Now did you get it? Particle Physics is nothing but the study of how our universe was made and what our universe is constituted of. To prove their existence and see how they behave, scientists observe them until the particles leave a sign. Often, instead of waiting for the particles to leave a sign, they make particles by colliding known particles. How? Well, the accelerators speed up the known particles almost to the speed of light. The particles collide and release massive energy, which results in the creation of new particles. This is why Particle physics is also known as High Energy Physics . At present, there are 17 particles that have been identifie
Read more

Gluons

By -
Image
    Table of contents  GLUONS View my previous article here - Introduction to Quantum Electrodynamics and Quantum Chromodynamics View the next article here - Introduction to Feynman Diagrams ----------------------------------------- Just like how electrons carry the electric charge, the quarks also carry the electric charge, but this electric charge is weaker in quarks. Quarks additionally carry a coloured charge , as discussed in the previous article . This coloured charge generates a gluon force field. An accelerating quark creates a vibrating ripple in the gluon field, which is known as gluons. Just like how a photon can create an electron and positron (anti-electron) pair - energetic gluon can create a quark and antiquark pair - While the electromagnetic charge has only one version, the colour charge has 3. But the colour charge never shows up in the hadron quark combinations. (Keep reading to find out about hadrons.) This led to the idea that the three colour charges were red, yel
Read more