Left Right Symmetric Extension of SM and vMSM

In summary, the Left Right Symmetric Extension of the Standard model and the Neutrino Minimal Standard Model are two different extensions of the Standard model that add three right handed neutrinos. The right handed neutrinos in the nuMSM are singlets. Those in the LR SM form right handed doublets together with the right handed charged leptons. The LR model has an extra gauge group and therefore more gauge bosons. The scalar sector is also different. All feemions are placed in either left or right handed doublets. The nuMSM is little more than just adding the right handed singlets a la seesaw type I and finding values of masses and mixing that can fit several
  • #1
Trixie Mattel
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Hello.

Im trying to learn more about different extensions of the standard model.

Are the Left Right Symmetric Extension of the Standard model and the Neutrino Minimal Standard Model different extensions?

I know both add 3 right handed neutrinos. Do these neutrinos differ in any way, also are there other differences between the models.

I know the LR symmetric extension is based on the gauge group SU(2)l x SU(2)r x U(1) b-l.
Is the vMSM based on a gauge group and if so which one?
 
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  • #2
Trixie Mattel said:
Are the Left Right Symmetric Extension of the Standard model and the Neutrino Minimal Standard Model different extensions?
No. However, you might be able to accommodate the nuMSM in the LR SM (it would work based on content - not sure about the phenomenological status).

Trixie Mattel said:
I know both add 3 right handed neutrinos. Do these neutrinos differ in any way, also are there other differences between the models.
The right handed neutrinos in the nuMSM are singlets. Those in the LR SM form right handed doublets together with the right handed charged leptons.

The LR model has an extra gauge group and therefore more gauge bosons. The scalar sector is also different. All feemions are placed in either left or right handed doublets.

The nuMSM is little more than just adding the right handed singlets a la seesaw type I and finding values of masses and mixing that can fit several phenomena.
 
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Likes Trixie Mattel
  • #3
Orodruin said:
No. However, you might be able to accommodate the nuMSM in the LR SM (it would work based on content - not sure about the phenomenological status).The right handed neutrinos in the nuMSM are singlets. Those in the LR SM form right handed doublets together with the right handed charged leptons.

The LR model has an extra gauge group and therefore more gauge bosons. The scalar sector is also different. All feemions are placed in either left or right handed doublets.

The nuMSM is little more than just adding the right handed singlets a la seesaw type I and finding values of masses and mixing that can fit several phenomena.
So they are two different extensions??

Do the right handed neutrinos only get their mass from the seesaw mechanism in the vMSM?? How are they given mass in the L-R symmetric extension?

Do you have any suggestions where I may be able to read up more about these two extensions?

Thank you
 

1. What is the Left Right Symmetric Extension of SM and vMSM?

The Left Right Symmetric Extension of SM (Standard Model) and vMSM (vector-like Minimal Supersymmetric Model) is a theoretical framework that extends the existing Standard Model of particle physics by adding a new symmetry between left-handed and right-handed particles.

2. What is the motivation behind developing this extension?

The Left Right Symmetric Extension of SM and vMSM is motivated by the desire to address several limitations of the Standard Model, such as the absence of right-handed neutrinos and the inability to explain the observed matter-antimatter asymmetry in the universe. It also aims to provide a more unified and symmetric description of fundamental particles and their interactions.

3. How does this extension affect the predictions of the Standard Model?

The Left Right Symmetric Extension of SM and vMSM introduces new particles and interactions, which can lead to new predictions that differ from those of the Standard Model. For example, it predicts the existence of right-handed neutrinos and new interactions between particles that can affect their decay rates and other observable properties.

4. Are there any experimental results that support this extension?

While there is currently no direct experimental evidence for the Left Right Symmetric Extension of SM and vMSM, some of its predictions have been indirectly supported by observations. For instance, the observed neutrino oscillations provide evidence for right-handed neutrinos, which are a key component of this extension.

5. What are some potential implications of the Left Right Symmetric Extension of SM and vMSM?

If this extension is confirmed by future experiments, it could have significant implications for our understanding of the universe and its fundamental particles. It could also provide new insights into phenomena such as dark matter and the matter-antimatter asymmetry, and potentially open up new avenues for technological advancements in areas such as energy production and medical imaging.

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