I When is a right handed neutrino a heavy neutral lepton(HNL)?

  • I
  • Thread starter Thread starter Trixie Mattel
  • Start date Start date
  • Tags Tags
    Neutral Neutrino
Trixie Mattel
Messages
28
Reaction score
0
Hello,

I was just wondering when is a right handed neutrino a heavy neutral lepton?

I know that RH neutrinos show up in a number of extension to the standard model, for example the neutrino minimal standard model (vMSM) and Left-right symmetric extensions.

Ive heard them being referred to as HNL at times and was wondering is it a name that can always be used for RH neutrinos? Or is it only in certain models, or with certain constraints that they can be called heavy neutral leptons?
 
Physics news on Phys.org
I strongly advise that you stop putting the nuMSM at the same level as LR symmetric models. The nuMSM is not a model in the same sense as it is essentially a particular realisation of a type I seesaw where the parameters are chosen in a particular fashion in order to solve a set of SM problems.

Right handed neutrinos are not always heavy. If they are not, they would not be classified as such. However, if they are, they would be heavy neutral fermions.
 

Thread 'Toponium Discovered'

Toponium is a hadron which is the bound state of a valance top quark and a valance antitop quark. Oversimplified presentations often state that top quarks don't form hadrons, because they decay to bottom quarks extremely rapidly after they are created, leaving no time to form a hadron. And, the vast majority of the time, this is true. But, the lifetime of a top quark is only an average lifetime. Sometimes it decays faster and sometimes it decays slower. In the highly improbable case that...
View full post »

Thread 'Dirac-Delta from Normalization of Continuous Eigenfunctions'

I'm following this paper by Kitaev on SL(2,R) representations and I'm having a problem in the normalization of the continuous eigenfunctions (eqs. (67)-(70)), which satisfy \langle f_s | f_{s'} \rangle = \int_{0}^{1} \frac{2}{(1-u)^2} f_s(u)^* f_{s'}(u) \, du. \tag{67} The singular contribution of the integral arises at the endpoint u=1 of the integral, and in the limit u \to 1, the function f_s(u) takes on the form f_s(u) \approx a_s (1-u)^{1/2 + i s} + a_s^* (1-u)^{1/2 - i s}. \tag{70}...
View full post »

Similar threads

I Right Handed Neutrinos/Heavy Neutral Leptons
Replies
1
Views
1K
I What is the electric charge of a neutrino?
Replies
6
Views
2K
I Seesaw Mechanism of vMSM and Left Right Symmetric Extension
Replies
2
Views
1K
I How do the collider experiments measure the mass of the W boson?
Replies
4
Views
4K
I What is the origin of the non-existence of right handed chiral neutrinos?
Replies
13
Views
2K
Neutral Pion and Right-Handed Neutrinos
Replies
6
Views
4K
I Neutrino Mass, Baryogenesis, Dark Matter (Beyond the SM)
Replies
9
Views
3K
Right handed neutrino identity
Replies
4
Views
2K
Some words on neutrino physics?
Replies
4
Views
2K
What is the diference between right handed neutrinos And quarks?
Replies
3
Views
3K

Hot Threads

Recent Insights

Back
Top