Seesaw Mechanism of vMSM and Left Right Symmetric Extension

In summary, the seesaw mechanism is a model used to explain the existence of mass in neutrinos and the small coupling of their Dirac mass and Yukawa coupling compared to other fermions. It requires the existence of right-handed neutrinos, which can either be singlets or doublets depending on the type of seesaw considered. The difference between the seesaw mechanisms in the nuMSM and in Left-Right symmetric extensions of the standard model lies in the type of particles required and the role of the Higgs field. While the nuMSM has a doublet Higgs, Left-Right symmetric extensions may include additional gauge bosons.
  • #1
Trixie Mattel
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I know the seesaw mechanism is a model used to explain both neutrinos having mass and why their dirac mass/yukawa coupling is so much smaller than for the other fermions.

The seesaw mechanism needs the right handed neutrino to exist. How does the seesaw mechanism for the vMSM differ from that of a Left Right Symmetric extension of the standard model considering that in the vMSM the right handed neutrino is a singlet (for SU(2)) whereas in LR symmetric extensions the right handed neutrino is in a doublet with its corresponding flavour lepton

Also does a difference in the two mechanisms lie in the fact that the Higgs is a doublet in vMSM and a multiplet in a Left Right symmetric extension?

Thank you
 
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  • #2
Hmmm... I don't think that the see-saw mechanism predicts new particles apart from the possible extra Higgs' ? While LR models predict the existence of new gauge bosons ([itex]W'_R, Z'_R[/itex])?
 
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Trixie Mattel said:
The seesaw mechanism needs the right handed neutrino to exist.
This depends on which type of seesaw you are considering. In the type-II seesaw there is a doublet scalar and no right-handed neutrinos and in the type-III there are SU(2) triplet fermions.

Trixie Mattel said:
How does the seesaw mechanism for the vMSM differ from that of a Left Right Symmetric extension of the standard model considering that in the vMSM the right handed neutrino is a singlet (for SU(2)) whereas in LR symmetric extensions the right handed neutrino is in a doublet with its corresponding flavour lepton
After the LR symmetry breaking - not at all. Apart from that the nuMSM is a particular implementation that needs particular parameter combinations to be realized.

ChrisVer said:
Hmmm... I don't think that the see-saw mechanism predicts new particles apart from the possible extra Higgs' ?
See above. Type-I: Extra fermion singlets (sterile neutrinos/right-handed neutrinos). Type-II: Triplet scalar. Type-III: Triplet fermions. There is no need for extra higgses (unless in the type-II if you count any scalar as a higgs).
 

1. What is the seesaw mechanism in the context of vMSM and Left Right Symmetric Extension?

The seesaw mechanism is a theoretical framework used to explain the origin of the tiny masses of neutrinos, which are fundamental particles with extremely small masses. In the context of vMSM (vector-like Mirror Standard Model) and Left Right Symmetric Extension, the seesaw mechanism refers to a specific approach to understanding the masses of neutrinos within these theoretical frameworks.

2. How does the seesaw mechanism work in vMSM and Left Right Symmetric Extension?

The seesaw mechanism in vMSM and Left Right Symmetric Extension involves introducing new particles called heavy Majorana neutrinos, which have exceptionally high masses. These heavy Majorana neutrinos then mix with the light neutrinos of the Standard Model, resulting in a seesaw-like effect that explains the small masses of the light neutrinos.

3. What evidence supports the seesaw mechanism in vMSM and Left Right Symmetric Extension?

Currently, there is no direct experimental evidence for the seesaw mechanism in vMSM and Left Right Symmetric Extension. However, the predictions made by this theoretical framework align with certain observations, such as the small masses of neutrinos and the existence of dark matter. Further research and experiments are needed to confirm the seesaw mechanism in these theoretical frameworks.

4. What are the implications of the seesaw mechanism in vMSM and Left Right Symmetric Extension?

The seesaw mechanism has significant implications for our understanding of the fundamental particles and forces in the universe. It could potentially explain the small masses of neutrinos and the existence of dark matter, providing insights into the nature of the universe and its evolution. The confirmation of the seesaw mechanism in vMSM and Left Right Symmetric Extension would also have implications for future research and the development of new theoretical frameworks.

5. How does the seesaw mechanism in vMSM and Left Right Symmetric Extension relate to other theories of neutrino masses?

The seesaw mechanism in vMSM and Left Right Symmetric Extension is just one of several proposed explanations for the masses of neutrinos. It is closely related to other seesaw mechanisms, such as the Type I and Type III seesaw mechanisms, which also involve the introduction of heavy particles to explain the small masses of neutrinos. However, the seesaw mechanism in vMSM and Left Right Symmetric Extension has unique features and predictions that distinguish it from these other theories.

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