Is Z0 Particle Real Without Flavor-Changing Interactions?

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Discussion Overview

The discussion revolves around the existence of the Z0 particle in the context of flavor-changing interactions. Participants explore whether the absence of such interactions affects the ability to confirm the particle's existence, considering both theoretical and experimental perspectives.

Discussion Character

  • Debate/contested, Technical explanation, Experimental/applied

Main Points Raised

  • One participant questions how the lack of flavor-changing Z0 interactions could allow for the confirmation of the particle's existence, suggesting that particle decay is essential for identification.
  • Another participant argues that the absence of flavor-changing interactions does not preclude knowledge of the Z0's existence, as decays into particle-antiparticle pairs can still be observed.
  • A participant notes that the cleanest production method for the Z0 is through electron-positron collisions at the Z0 resonance.
  • There is a discussion about charge conservation in Z0 interactions, with a participant confirming that charge is conserved since the Z0 carries no charge.
  • One participant mentions that flavor-changing Z interactions could lead to decays involving different flavors, which are not observed, while flavor-conserving interactions are confirmed through experiments.

Areas of Agreement / Disagreement

Participants express differing views on the implications of flavor-changing interactions for confirming the existence of the Z0 particle. The discussion remains unresolved regarding the necessity of flavor-changing interactions for establishing the particle's existence.

Contextual Notes

Participants reference experimental limits on flavor-changing decays and the production of the Z0 particle, but there are no detailed resolutions to the assumptions or implications of these points.

AdvaitDhingra
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If there are no flavor changing z0 weak interactions, how do we even know that the particle exists? I thought that we could only tell which particle was exchanged by the particles it decays into. Is this wrong?
 
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How would the absence of flavour changing Z0 interactions preclude the knowledge of its existence? You will still see the decays to particle-antiparticle pairs just the same. The cleanest way of producing Z0 is to collide electrons with positrons at the Z0 resonance.
 
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Orodruin said:
How would the absence of flavour changing Z0 interactions preclude the knowledge of its existence? You will still see the decays to particle-antiparticle pairs just the same. The cleanest way of producing Z0 is to collide electrons with positrons at the Z0 resonance.
Oh ok. So a z0 Boson interaction is one where charge is conserved? (since the z0 carries no charge)
 
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Do you see a peak (Z) or not (no Z)?

1618312813823.png
 
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Charge is always conserved.

Flavor-changing Z interactions would allow e.g. electron plus antimuon to Z, or Z to these two particles. We don't observe that decay (experimental upper limit is ~10-6), but of course we see the flavor-conserving electron+positron->Z production (that's what we can actually collide in colliders) and the equally flavor-conserving decays to quark plus matching antiquark.
 
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