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Results tagged with beyond-the-standard-model
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user 66086
Use this tag for questions beyond the standard laws of physics (General Relativity and the Standard Model) if a more specific tag, like "string-theory", "loop-quantum-gravity", "supersymmetry", etc. do not apply.
3
votes
Accepted
Why is the neutrino oscillation probability formula independent of the Majorana phases?
I assume you mean the routine formula, for Greek flavor indices and Latin mass eigenstate indices,
$$
P_{\alpha\rightarrow\beta}=\left|\left\langle \nu_\beta(t)|\nu_\alpha\right\rangle \right|^2=\left …
- 66.3k
2
votes
Accepted
Are so-called "model independent" searches for new physics in particle physics collider actu...
My comment, as per request:
You are victimized by bad language. The "Standard Model" is an established Theory... the name is a mere historical throwback. "Models" are supposed to be conjectural specul …
- 66.3k
2
votes
Accepted
Is any particle allowed within the laws of physics?
I'm not sure I understand what you mean by lower bounds, since there are massless, and also chargeless particles, like the photon. Let's stick to upper bounds.
When it comes to charge, hadronic resona …
- 66.3k
1
vote
Accepted
Why the second-class currents (SCC) are beyond the SM?
Second class currents is a 1958 term introduced by Weinberg for naturally suppressed non-strange G-parity violating effects in the hadronization of the charged weak current coupling to the Ws, not ful …
- 66.3k
0
votes
Accepted
Jarlskog Invariant
There is a large rephasing freedom in the SM formalism for fermions in CP violating amplitudes: these are based on the existence of at least one nonremovable non-vanishing phase in the CKM (and PMNS) …
- 66.3k
2
votes
Accepted
How is $\Delta m^2_{12}$ is identified with the solar mixing angle?
The most important effect in estimating the anticipated production of neutrino types out of the sun is the MSW effect, resonant conversion in matter, and the estimate is a complicated business, but ap …
- 66.3k
1
vote
Accepted
How will the light neutrino mass hierarchy be determined?
Your question is magnificently broad. The outstanding review of the searches by Qian and Vogel 2015 covers all bases and all dozen experiments and alternate pathways/techniques.
Accelerator Neutrino …
- 66.3k
2
votes
Why is a fourth type of active neutrinos not allowed by the invisible width of the $Z$-boson?
Your question is quite obscure, but I'm starting a placeholder answer, to avoid a garland of comments in a clarificatory conversation.
The full width of the Z is about 2.5 GeV, of which the visible le …
- 66.3k
1
vote
Accepted
Fierz identities and Weinberg operator
It is the SU(2) doublet indices being transposed in the Weinberg term, not the spinor indices, of which there are just two (and these two are always saturated with each other, and in no need of redist …
- 66.3k
2
votes
Accepted
Constraints on RH component of fermion triplet under $SU(2)_L$
Well, the triplet representation you wrote is real. There is a term where L and R fermions talk to each other, namely the mass term. For your extreme hypothetical fermions, the mass terms cannot be ga …
- 66.3k
0
votes
Accepted
Lagrangian kinetic term for a Bi-doublet field in $SU(2)\times SU(2)$
It appears that you are misunderstanding the notation. Before descending into covariant derivatives, let's focus on the left-handed leptons, i.e., those with the left-chiral projector on the left, hen …
- 66.3k
1
vote
Why must $U(1)$ matrices commute with $SU(2) \times SU(3)$ matrices in embedding within $SU(...
I'm not quite sure what your question is. The U(1) does not rephase SU(5) quintuplets uniformly: it rephases the doublet direct summand differently from the triplet summand, because these have differe …
- 66.3k
2
votes
Accepted
About Majorana neutrinos and chirality
This review might help. It is impossible to have a chiral (Weyl) Majorana neutrino. An easy mnemonic for the only part of your diagram that is relevant, the virtual $W^-W^-\to e^- e^-$ part, is the …
- 66.3k
1
vote
Accepted
Majorana mass matrix seesaw and renormalizable interactions
Your question is virtually answered in this one.
The SU(2)×U(1) gauge-invariant fermion bilinears corresponding to each term of the matrix have their origins in the terms of dimension [d],
$$
M_L: ~ …
- 66.3k
8
votes
Accepted
Is neutrino mass really physics "beyond the Standard Model"?
So my real question is, do any of the extension of the SM to add neutrino mass signal new physics? What does even count as new physics? I think it would be something like a fifth force. Not sure what …
- 66.3k