Questions tagged [higgs]
This higgs field breaks electroweak symmetry and provides mass to particles though a process called the higgs mechanism. The excitation of the higgs field is called a higgs boson.
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How did this generalized NJL model from 1993 predict Higgs boson and top quark masses?
Since the Higgs boson was found in 2012, at a mass around 125 GeV, it has often been remarked that this is curiously close to "criticality" or "metastability" or a false vacuum, if ...
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Form of SM hypercharge current and anomalies
I have a doubt regarding the SM hypercharge current associated with the $U(1)_Y$ global symmetry (note: I want to work in the unbroken phase, we have the doublet H and the Yukawas)
$\psi \to e^{i\...
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Would observed limit on resonant double Higgs production the same if the scenario considered is spin $0$ scalar or spin $0$ radion particle?
At LHC, some analyses search for resonant HH production, from an unknown particle labelled $X$. They typically make the limit on cross-section of resonant HH production as a function of the spin of ...
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$γγh$ interaction in the Standard Model
The topology for the lowest order $γγh$ interaction in the Standard Model is given by
where we have an intermediate top quark loop. I am confused with the charge conservation at each vertex. Since ...
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The "survival hypothesis" and supersymmetry
Tidying up my old papers I came across my supersymmetry notes from the late 80s. I thought I'd reread them. They may be out of date now. I find the mathematics somewhat comprehensible but not the ...
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Why on the ATLAS Higgs discovery paper there are uncertanties on the expected cross section upper limits but not on the observed upper limits?
I was reading the ATLAS paper on the Higgs discovery and a question came to my mind. In the plot I attached, there are uncertainty bands on the background only hypothesis upper limits, and not on the ...
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Are there any visually accurate simulations of Higgs interactions?
For various fundamental phenomena, there are visually accurate simulations. For example: electromagnetism or the Schrödinger equation.
All I can find to visualize the Higgs Field is this potential in ...
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Predicting a nonzero mass for the photon
This is a concern I had after I had read the reply for a previous question I had: On the masslessness of the photon
So, I have been told that there are cases in which the gauge symmetry that preserves ...
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What is the current theoretical and experimental understanding of the mass of the photon? [duplicate]
To what extend are we allowed to claim that the photon has some sort of mass, below some threshold. We certainly have no experimental evidence that the photon is completely massless, but, due to the ...
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Reconciling mass due to the Higgs mechanism with a particle being asymptotic
I have a basic understanding of how the Higgs mechanism works, and how it can be used to explain, or perhaps rather accommodate, masses of elementary particles like fermions, without breaking gauge ...
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What force could theoretically redirect the Higgs field? [duplicate]
I’d just like to point out I am by no means a physics expert, or indeed a particularly knowledgable nerd on this subject. I am a minor and a wannabe sci-fi writer who is trying to come up with an idea ...
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Is the higgs metastability dependent on renormalization scheme?
It is said that, in the absence of physics beyond the Standard Model (SM), the higgs potential
$$V_h= -\mu^2 \Phi^\dagger \Phi +\lambda (\Phi^\dagger \Phi)^2$$
becomes metastable (is unbounded from ...
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Taylor expansion of some Lagrangian (Understanding the Blundell's Quantum field theory, Example 26.5)
I am reading the Lancaster, Blundell's Quantum field theory for the Gifted Amateur, p.243, Example 26.5 and I can't understand some sentences and I don't know how to expand some Lagrangian.
I am a ...
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How does the oscillation of the Higgs field contribute to its role as mass-giver?
I read that the Higgs field is a pair of complex numbers at each point of spacetime, and since we know that the Higgs boson has a mass, I'm imagining that these complex numbers oscillate over time at ...
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Physicality of electroweak bosons
The energies achieved at modern particle accelerators are much higher than the all scales relevant to the electroweak unification. I was therefore wondering why what is measured at scattering ...
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