What is the W- boson in beta decay?

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Discussion Overview

The discussion centers around the role of the W- boson in beta decay, specifically its composition, function, and implications for mass and energy conservation. Participants explore theoretical aspects of particle interactions and the nature of gauge bosons.

Discussion Character

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

Main Points Raised

  • Some participants describe the beta decay process as involving a neutron converting into a proton with the emission of a W- boson, which subsequently decays into an electron and an electron anti-neutrino.
  • There is a question regarding the quark composition of the W- boson, with some participants noting that it does not contain quarks and is instead a gauge boson mediating electroweak interactions.
  • One participant expresses confusion about whether the W- boson is a meson, clarifying that it does not have quarks.
  • Another participant asserts that the emission of the W- boson involves a d quark in the neutron transforming into a u quark, raising questions about mass loss during this process.
  • There is a discussion about the implications of the W- boson's mass on energy conservation, with one participant stating that its massive nature leads to a violation of energy preservation that necessitates a rapid decay in accordance with the Heisenberg uncertainty principle.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the nature of the W- boson and its role in beta decay. While some points are clarified, there remains uncertainty about the implications of mass loss and the details of the decay process, indicating that the discussion is not fully resolved.

Contextual Notes

Participants mention the need for further clarification on the relationship between the W- boson and quarks, as well as the implications of its mass on energy conservation, suggesting that these areas may require more detailed exploration.

JJ
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neutron => proton + W- => proton + electron + electron anti-neutrino

What're the quarks composing W-? To convert a neutron to a proton, there would need to be the expulsion of a down anti-up pair. That would mean a tad bit of mass loss, how does this work?
 
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JJ said:
neutron => proton + W- => proton + electron + electron anti-neutrino

What're the quarks composing W-? To convert a neutron to a proton, there would need to be the expulsion of a down anti-up pair. That would mean a tad bit of mass loss, how does this work?

A d quark in the neutron emits the W- and becomes a u quark., but there are no quarks in the W. The W is called a gauge boson, and it mediates electroweak interactions between leptons. It's a distinct type of particle from a quark (which is a lepton).

The photon is another example of such a boson, as are the Z, gluon, and graviton (if it exists).
 
So it isn't a meson (edit: wait, stupid question as it doesn't have quarks)? By mediating the electroweak interaction, do you mean it is emitted from the neutron and then splits into an electron and antineutrino? Is it as simple as that or more complicated? If it is complicated, don't bother yourself with explaining it here.

Thank you.
 
Last edited:
It is as simple as that. In any case you can consider that the W is very massive, thus the emission violates energy preservation and thus it must decay in a very short time, inverse of the mass or so, to meet Heisenberg principle.
 

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