Will two particles never touch each other?

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Discussion Overview

The discussion revolves around the nature of interactions between particles in the context of quantum mechanics, specifically focusing on the concept of "gaps" or "channels" in particle interactions as represented in Feynman diagrams. Participants explore the implications of these representations in weak decay processes and scattering events.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that there may be a "gap" or "channel" between two particles during interactions in weak decay processes.
  • Another participant argues that Feynman diagrams should not be interpreted as classical representations of particle interactions, emphasizing that particles do not have classical properties such as size or exact position.
  • A further clarification states that a Feynman diagram is not a "position versus time" diagram, reinforcing the non-classical nature of particles.
  • One participant expresses confusion about the absence of a "channel" or "gap" when particles collide, indicating a desire for further understanding.
  • Another participant shares a personal interpretation of the 3-W exchange process, proposing a scenario where particles push each other back or inward depending on the point of collision.
  • Reiteration of the idea that there is no gap in particle interactions, and that rearranging lines in Feynman diagrams does not alter the underlying physics.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the interpretation of "gaps" or "channels" in particle interactions, with multiple competing views expressed regarding the nature of particle collisions and the representation of these interactions in Feynman diagrams.

Contextual Notes

Participants express varying levels of understanding and familiarity with quantum mechanics and Feynman diagrams, indicating a range of assumptions and interpretations that may affect the discussion.

Who May Find This Useful

This discussion may be of interest to individuals exploring quantum mechanics, particle physics, and the interpretation of Feynman diagrams, particularly those new to the concepts or seeking clarification on particle interactions.

Superleopard21
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i found that in the 3 W-W exchange of 4-fermion interaction of weak decay of Neturon beta-decay process and also this happens in scattering process,is there will be a gap or a channel between two particles?

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What do you mean by a "gap"? This is a quantum process and the Feynman diagram is a pictorial representation of a term in a mathematical expansion. It should not be viewed as a pictograph of what is going on in terms of classical particles because particles are not classical at the quantum level.
 
More explicitly: you should not view a Feynman diagram as a "position versus time" diagram.
 
but I Seen from the particle physics textbook,it called the "gap" as a channel.
 
There is no gap. You can rearrange the lines arbitrarily (as long as the connections stay the same) and physics does not change, this is just the most convenient way to graph it.

"Channel" refers to a specific Feynman diagram or a class of Feynman diagrams.

The concept of touching does not make sense for elementary particles. They do not have a size, and they do not have an exact position.
 
thanks for letting me know that there is no"touch" in particles in the classical pysics,otherwise my mind is going to be blowed up,coz I am just a starter and an amtateur,so maybe I will have more questions.But I really get confused why ?there is really no channel or gap between two particles when they collided?
 
my assumption for understanding the 3-W exchange in 4-Fermman inmteraction is that if an particle crashed onto the front of another particle,it will be pushed backwards for some distance,and it will be reflected and remain the same horinzontal level direcrion;but if a particle crashed onto the back (or the inner space)of another particle ,it will be pushed inwards and but goes opposite direction

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actually what is another way to understand this ?the above post is just my own special thinking about 3-w exchnage in 4-fermmann diagram
 
mfb said:
There is no gap. You can rearrange the lines arbitrarily (as long as the connections stay the same) and physics does not change, this is just the most convenient way to graph it.

"Channel" refers to a specific Feynman diagram or a class of Feynman diagrams.

The concept of touching does not make sense for elementary particles. They do not have a size, and they do not have an exact position.
thanks a lot!
 

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