Feynman diagrams are a graphical representation of the processes involved in particle physics reactions. This video is the second episode of a series of three that presents what are Feynman diagrams, how to understand and use them, and how to build them. In this episode you will learn what are the elements you need to know to read Feynman diagrams and build your own: space-time diagrams, particle symbolism and vertices. We will use for this a well-known particle physics reaction as support, electron repulsion. We will also have a look at vertices involving the decay of a gluon into a quark and an anti-quark as well as the transformation of a quark and an anti-quark into a weak force boson. Feynman diagrams are an insightful tool that puts to light the wonders of particle physics. The reactions occurring in particle physics are a marvel of processes involving the forces of nature (weak force, strong force and electromagnetic force). Writing these like a chemical reaction does not provide information about the processes involved, just what you start up with, and what you end up with. One can use the Quantum Chromodynamics (QCD) and Quantum Electrodynamics (EOD) to model quite well what is going on, but the mathematics involved is not for everyone! Instead, graphical representation of these reaction, invented by Richard Feynman, allow all to visualize the processes involved easily: Feynman diagrams. He introduced these originally as a graphical aid for visualizing and calculating interactions between electrons and photons. Today, Feynman diagrams are commonly used to depict all types of particle interactions. These videos are intended to help high school students with their physics studies as well as high school physics teachers wondering how to approach the topic with their students. **** Access to the Videos **** Introduction: Content review of the Feynman Diagram mini-series: https://youtu.be/O9ihGuK53Ww Episode 1: What is a Feynman Diagram? (brief overview of Feynman diagrams, using as support a very well-known reaction, beta decay): https://youtu.be/TLBXrMixcu8 Episode 3: Feynman Diagrams, Let’s build some! (Learning how to build Feynman diagrams by example, using particle physics reactions like muon decay, pion decay, Kaon decay etc.: https://youtu.be/vgk2aJRlBcg SUPER USEFUL - The table of particles: https://www.physics-made-easy.com/Standard-Model-of-Particle-Physics If you are not familiar with Particle physics, I recommend you start by viewing the series of videos that deals in detail with particle physics reactions: _ Introduction: https://youtu.be/gy-durcAhJ4 _ Elementary and composite particles of the standard model: https://youtu.be/AJSL39hVVPw _ Quantum numbers of particles: https://youtu.be/3SVMrLmGHWQ _ Conservation laws ... https://www.youtube.com/watch?v=JScJjZ9zW7A

Particles are the Lego bricks of nature. Their interaction with each other constructs all matter that is present in our universe. Particle Physics studies how particles interact with each other . In this lesson, divided into separate 3 videos, you will learn about fundamental particles, about the quantum numbers associated with each of them, and how to predict and write particle physics reactions . In this video (PART 2/3), we get a detailed look at some of the properties of elementary and composite particles, which are expressed as quantum numbers (Baryon number, Electric Charge, Lepton number, Strangeness). - - - - - - - - - - - - - - - Access to the table of particles: https://www.physics-made-easy.com/Standard-Model-of-Particle-Physics This lecture is structured in three sections that follow a general introduction: INTRODUCTION: https://youtu.be/gy-durcAhJ4 SECTION 1: The standard Model of Particle Physics https://youtu.be/AJSL39hVVPw SECTION3: Conservation laws and particle physics reactions https://youtu.be/E4JGzQjBgHg - - - - - - - - - - - - - - - PART 1 is a reminder of the standard model of particle physics. It presents the elementary particles (fermions, like quarks and leptons, and bosons, like the photon or the gluon). It shows how combining quarks lead to composite particles (hadrons like the proton, the neutron, the pion and the kaon). Antimatter is also discussed in this section. This first section is a brief overview, so if you wish to view a lesson on the standard model of particles with more details and at a slower pace head on to these two videos: Elementary particles: https://youtu.be/guYfayO3ESI Composite particles: https://youtu.be/e-oyDDnI348 PART 2 is a detailed look at some of the properties of these particles, which are expressed as quantum numbers (Baryon number, Electric Charge, Lepton number, Strangeness). PART 3: In nature there are some symmetries that need to be respected in all interactions. These lead to the existence of conservation laws (via Noether's theorem). Quantum numbers need to follow these conservation laws. This idea is central. After viewing this section, you will be able to determine if a particle physics reaction is possible or not. For that, we will work on many examples of reactions including Beta decay, muon decay into a positron, and more. This video has a lot of information, it’s a real course in itself. I hope you enjoy it and that it helps in giving you a clearer idea about the reactions between particles. If you are a high school teacher, feel free to use anything you see fit in this video for your own students . - - - - - - - - - - - - - - - This video is produced and presented by Edouard Reny, Ph.D. in solid state chemistry and private tutor in Physics. For access to g ... https://www.youtube.com/watch?v=3SVMrLmGHWQ