Discussion Overview
The discussion revolves around the necessity of incorporating Quantum Electrodynamics (QED) corrections into perturbative Quantum Chromodynamics (QCD) when considering high momentum interactions. Participants explore the implications of strong and electromagnetic forces at high energies, as well as related conservation laws in particle physics.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- One participant suggests that at high momentum, the strong interaction becomes asymptotically weak, allowing for the use of perturbative QCD, but questions whether QED corrections should be included due to the increasing electric charge.
- Another participant raises a question about the symmetry associated with lepton and baryon number conservation laws.
- A participant proposes that lepton number conservation corresponds to SU(2)xU(1) symmetry and baryon number conservation corresponds to SU(3) symmetry, suggesting that in many cases, QED corrections may not be necessary in perturbative QCD.
- There is a mention of potential violations of lepton number conservation within the Standard Model and a query about the implications for combining QED and QCD in such cases.
- A later post corrects an earlier statement, clarifying that lepton number conservation is violated within each family of leptons but remains conserved when considering all families collectively.
- Another participant introduces the idea that the discovery of neutrino mass indicates a slight breaking of the Standard Model and a violation of lepton number conservation.
- A participant discusses the nature of collisions between electrons and protons, speculating on the outcomes if quarks were considered chargeless, and describes the sequence of interactions in electron-positron annihilation leading to hadron production.
- There is a question about how to explain the strong force processes that occur during collisions between leptons and hadrons that result in the production of new hadrons.
Areas of Agreement / Disagreement
Participants express differing views on the necessity of QED corrections in perturbative QCD, with some suggesting it may not be needed in certain contexts, while others raise concerns about the implications of lepton number conservation violations. The discussion remains unresolved with multiple competing perspectives.
Contextual Notes
Participants highlight various assumptions regarding the applicability of conservation laws and the interplay between QED and QCD, but these assumptions are not fully explored or settled within the discussion.