terminology - What does "$n$-particle reducible diagram" mean ...
2024年9月5日 · A n-particle reducible diagram is a diagram that can be cut into two pieces if one cuts n or less lines. Conversely, a n-particle irreducible (n-PI) diagram cannot be cut into two …
quantum field theory - How to correctly understand these "1 …
2017年7月5日 · In QED, when dealing with the vacuum polarization and the photon propagator, some authors like Peskin & Schroeder introduce the so-called "1-particle irreducible" …
Terminology of 1PI diagram - Physics Stack Exchange
2017年2月15日 · 1. The amputation of lines has nothing to do with the diagrams being 1PI, so I'm not sure what you mean. 2. Questions about the origin/motivation of terminology should go to …
particle physics - How to interpret the Feymann diagram of two …
2018年8月25日 · In the t-channel (scattering), the diagram is not time-ordered. The exchange particle has a space-like four-momentum and the Feynman diagram represents 2 old-school …
Definition of one-particle irreducible diagrams
2018年11月10日 · 2. Textbooks often defines a one-particle irreducible diagram (1PI diagram) as a connected diagram which does not fall into two pieces if you cut one internal line.
What's the difference between $t$-channel and $s$-channel in …
If we substitute for our Mandelstam variables, we see the first diagram has $\mathcal{M}\sim 1/t$ and the second diagram $\mathcal{M}\sim 1/s$. Hence we say the first involves a t-channel …
Answered: •X X OY2 XY 2. The particle diagram… | bartleby
Chemistry. •X X OY2 XY 2. The particle diagram above shows the system represented by the equation 2X (g)+Y2 (g)=2XY (g) . Which of the following explains whether the particle diagram …
quantum field theory - Electron-Positron annihilation Feynman …
5. The positron is the electron going back in time. This is what the arrow means. But you have to remember that in physics, cause and effect are not by the direction of the arrows, but by the …
particle physics - Drawing Feynman diagrams including $\pi^0
2021年1月24日 · This implies that the Feynman diagram you draw is the right tree-level Feynman diagram for the process you are studying D+ → π0e+νe D + → π 0 e + ν e. More complex …
Connection between particle physics and weight diagrams
2020年11月24日 · Connection between particle physics and weight diagrams. I have a hard time combining two topics that are often discussed in physics in a coherent way. In a lot of …