LHC and seeing (simulating) particles

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Discussion Overview

The discussion revolves around how particles are simulated and detected at the Large Hadron Collider (LHC), particularly in relation to the uncertainty principle and the nature of observation in particle physics. Participants explore the methods of visualization and representation of particles, as well as the implications of detecting particles that may not interact with conventional means.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants question how particles are "seen" at the LHC and whether this contradicts the uncertainty principle.
  • It is noted that particles do not actually get seen in the traditional sense; rather, they leave tracks in detectors that are processed into visual representations by computers.
  • A participant explains that seeing involves biological processes and that what is observed is light interacting with objects, not the objects themselves.
  • There is a discussion about tunneling electron microscopes and how they provide averaged representations of atomic structures, raising questions about the nature of observation.
  • Concerns are raised about the existence of particles that do not interact with electric current and whether they could remain unrecognized.
  • Another participant counters that even if certain particles are not directly observed, their effects, such as energy loss, can indicate their presence, citing neutrinos as an example of particles that interact via the weak force.

Areas of Agreement / Disagreement

Participants express varying views on the nature of observation in particle physics, with some agreeing on the limitations of direct observation while others raise concerns about unrecognized particles. The discussion remains unresolved regarding the implications of these observations and the nature of particles that do not interact in conventional ways.

Contextual Notes

Participants highlight the dependence on specific interactions (e.g., electromagnetic and weak forces) for detecting particles, and the limitations of current detection methods in recognizing all types of particles.

TeCNoYoTTa
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Sorry if this question is stupid, but how particles are simulated (seen) in the LHC like this
https://www.youtube.com/watch?v=9SyNttacl4s

does not that contradict with uncertainty principle ?
Can we actually see particles ?
 
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TeCNoYoTTa said:
Sorry if this question is stupid, but how particles are simulated (seen) in the LHC like this
https://www.youtube.com/watch?v=9SyNttacl4s

does not that contradict with uncertainty principle ?
Can we actually see particles ?
No.You don't actually see particles. What happens is the particles leave tracks in detectors and that data is changed into something that can be illustrated with a computer.

Seeing is a biologgical process of photons entering the eye and being processed by the brain. In reallity we only really "see" light. When it is said that we "see" something what we mean is that what we are observing is interacting with light and its the light coming from the object that we see.

Consider a tunneling electron microscope. Current is established through the tip of a needle, the strength of the current being a function of the distance between needle and the sea of electrons which comprise the outer conduction electrons in matter. That current is recorded and then the data displayed on a computer screen the like. What is illustrated by the computer is a representation of the surface of matter. In this way we can "see" the atoms that comprise the surface of the material we are analyzing. But what we're really looking at is an averaged out representation of what is being analyzed.

Make sense?
 
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Phy_Man said:
No.You don't actually see particles. What happens is the particles leave tracks in detectors and that data is changed into something that can be illustrated with a computer.

Seeing is a biologgical process of photons entering the eye and being processed by the brain. In reallity we only really "see" light. When it is said that we "see" something what we mean is that what we are observing is interacting with light and its the light coming from the object that we see.

Consider a tunneling electron microscope. Current is established through the tip of a needle, the strength of the current being a function of the distance between needle and the sea of electrons which comprise the outer conduction electrons in matter. That current is recorded and then the data displayed on a computer screen the like. What is illustrated by the computer is a representation of the surface of matter. In this way we can "see" the atoms that comprise the surface of the material we are analyzing. But what we're really looking at is an averaged out representation of what is being analyzed.

Make sense?

Thanks, It makes sense now.
but what if there are particles out there that does not interact with electric current, is not that possible ? won't these particles be left unrecognized although they are actually there ?
 
TeCNoYoTTa said:
Thanks, It makes sense now.
but what if there are particles out there that does not interact with electric current, is not that possible ? won't these particles be left unrecognized although they are actually there ?

Ah, but if we DON'T see these particles, then we will see a loss of energy and know that such particles exist. That is actually one of the goals of some of the detectors.

And yes, there are already particles that do not interact via the electromagnetic force. They are called neutrinos. They can still be detected because they interact via the weak force and can impart momentum and energy into other particles that also interact via the weak force. You'd basically see a particle somewhere in the detector get hit out of nowhere and then see a trail as that initial particle hits others. Knowing what type of particle got hit, you can calculate the energy of the collision and determine what hit it.
 
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