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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What mathematics indicate that the vacuum of the universe is metastable?
As I understand it, the meta stability of the universe's vacuum depends on the electroweak force, which depends on the mass of the top quark and the Higgs boson. But I don't understand this fully. Can ...
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Does electric potential give electron mass as same as higgs field?
Inside negatively charged ball there is constant electric potential. If electron will be placed inside ball with constants potential will it give mass from electric potential as same as higgs field ...
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Higgs Boson and Chirality
I have seen some statements that the Higgs boson is not responsible for particles gaining mass, but rather the Higgs field is. However, as I understand it, the Higgs boson is just an excitation in the ...
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Perturbative calculation of hierarchy problem
I've been trying to understand the origin of the hierarchy problem for the Higgs mass but I've tied myself into some pretty nasty knots and I'm hoping someone can shed some light on this.
So as I see ...
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Is it possible for photons to gain mass and interact with the higgs field? [closed]
If objects gain mass as they approach the speed of light, is it possible that as a photon "attempts" to exceed the speed of light it gains enough mass to interact with the higgs field ...
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Imaginary Contribution to Diagrams with one $\gamma^5$ Vertex
It is possible to write down a Feynman diagram as below for production of a Higgs boson.
I am slightly confused because the fermion-fermion-$Z$ vertex has a factor of $c_V - c_A \gamma^5$, but the $...
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Cosmic Strings as Topological Defects (heuristics)
I have a lot of troubles to understand heuristically the principle behind Kibble's model for genesis of cosmic strings via Kibble mechanism. More precisely I not understand how to interpret following ...
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Doublet-triplet splitting in GUT: how can the "color triplet" have mass?
I'm hopelessly perplexed about the $SU(5)$ doublet-triplet splitting.
I read that the color triplet part of the Higgs quintuplet needs to have extremely high mass compared to the "electroweak&...
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How did the Higgs perturbatively give us the mass of all other particles?
In a recent conversation with my professor, he explained to me a misconception I had, in that given how physicists says that the Higgs "gives" the mass of all other particles, I was under ...
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Why do electrically charged fields necessarily interact with Higgs field? [duplicate]
There are no elementary charged particles without mass. Since elementary particles appear to acquire mass by the Higgs mechanism, the above statement seems to imply that any charged particle must ...
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How Atlas differentiated that the di-photon produced was not by a graviton but instead by a Higgs Boson decay?
The Wikipedia article here, https://en.wikipedia.org/wiki/Higgs_boson#Confirmation_of_existence_and_current_status , confirms (see "zero spin requirement" table row test) that the graviton (...
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Can a massless virtual graviton decay into a Higgs Boson and two γ-photons in the LHC at CERN? [closed]
Τheoretically, is it possible?
G--> H--> γγ
And if not, why?
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Hey there I'm a beginner in particle physics trying to "selfstudy" from online resources. I want to ask how much of what I learned is correct? [closed]
The information I have gained thus far regarding the standard model is;
fermions and how their intrinsic nature.
they have half spin, non zero mass, a charge, a weak hypercharge (for leptons), a ...
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What are the actual interactions between the Higgs field and fermions?
I have done a bunch of research regarding the Higgs field and Higgs boson but I keep running into issues when trying to understand how the interactions between the Higgs field and fermions occur. I ...
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How to derive mass term for fermions in $SU(2)\times U(1)$?
We have a 4 element higgs field representation:
$$\phi=\frac{1}{\sqrt2}\begin{pmatrix}
\phi_1 + i\phi_2\\
\phi_3 + i\phi_4
\end{pmatrix}
$$
it has a certain potential shape. Which looks like a hat. ...
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What would an inertial observer see watching a particle as the local temperature drops below the electroweak unification temperature?
Above about $10^{15} K$ (the electroweak unification temperature), the Higgs field doesn't interact with elementary particles to grant them masses. Above this temperature, they are all massless.
This ...
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Is the Higgs VEV unnatural?
Is there some way to argue that the Higgs VEV is unnatural, without even bringing up the Higgs boson mass? For example, can one show that the Higgs vev receives large corrections from new physics? The ...
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When particles began interacting with the Higgs field, what determined the specific numbers for their masses?
All up quarks and antiup quarks have the exact same mass of 2.3 MeV/c³, just as every instance of each particle also has an exactly set quantum for their mass, according to their kind.
But if the ...
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Why use infinite energy to change a vacuum to the another in usual SSB?
I am reading Strominger's Lecture in the IR triangle, there is a short argument about differences between the usual Higgs case and Large Gauge Symmetry (LGS) one in P38. Strominger says:
In the usual ...
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Decoupling in the Linear Sigma Model
In Schwartz's 'QFT and The Standard Model' the Lagrangian for the linear sigma model is given by:
$$L=\frac{1}{2}(\partial_\mu\sigma)^2+(\sqrt\frac{2m^2}{\lambda}+\frac{1}{\sqrt 2}\sigma(x))^2\frac{1}{...
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Chirality flip in electrons due to Yukawa interaction
This is the Lagrangian density for a fermions interacting with a Higgs field:
$$\mathcal{L}= i \bar{\Psi} {\gamma}_\mu {\partial}_\mu \Psi - (gv) \bar{\Psi} \Psi + \frac{1}{2} {(\partial h)}^{2} - \...
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$SU(2)$ with non-standard matter Supersymmetry
Consider the theory with 1 chiral multiplet $Φ$ of isospin 1 and 2 chiral multiplets $𝑄^I$ of isospin 1/2. The superpotential is $𝑊 = 0$.
I found the dimension of the moduli space as 4 by the Higgs ...
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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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Highest weight generator (HWG) for Higgs branch hilbert series of $U(k)$ gauge group with $N$ flavours
Can anyone help me in calculating the Highest weight generating function for Higgs branch of $U(k)$ with $N$ flavours. I am new to the quiver gauge theory.
I have calculated the Higgs branch Hilbert ...
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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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Classical Higgs Field for $G/H$ symmetry breaking, for $G=GL(4,\mathbb R)$ and $H=\rm Spin(4)$
In this paper https://arxiv.org/abs/hep-th/0510168, the author states on page 4 that if
$G=GL(4,\mathbb R)$ and $H=O(4)$, then the Higgs field is the Riemanian metric.
If $G=GL(4,\mathbb R)$ and $H=\...
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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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Can the low Higgs mass solve the problem of fine tuning of the Fermi constant?
The Standard Model indicates that quantum corrections to the Fermi constant make its value surprisingly large, and that its value could be closer to the Newtonian constant of gravitation unless there ...
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What happened to particles with less energy than their rest mass?
Today, particles like electrons can only be created if there is enough energy that exceed their corresponding rest-mass energy. As far as i understand, all particles were massless before the higgs ...
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Could the low Higgs mass be relevant to the unification of the (weak) nuclear force and gravity?
I found in a paragraph in a research paper (although it was talking about something else) the statement: that it is possible to unite the weak nuclear force and gravity, but that requires that:
Both ...
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Spontaneous Symmetry Breaking and gauge symmetry
As mention in David Tong's Lecture note:
Gauge symmetry is, in many ways, an odd foundation on which to build our best theories of physics. It is not a property of Nature, but rather a property of ...
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Some questions about Peccei-Quinn-Weinberg-Wilczek (PQWW) model
In PQWW model,we have two Higgs doublet($\phi_1$,$\phi_2$),and the Yukawa interaction of quarks is:
\begin{equation}
\mathcal{L}_{Y}^q=-f_{i j}^{(u)} \bar{q}_{L j} \phi_{2} u_{R i}-f_{i j}^{(u)} \phi_{...
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When was the Higg's particle created after the Big Bang?
Was the Higg's particle created with the Bag Bang?
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How to update $SU(2)$ Higgs fields with Heat Bath algorithm?
I'm trying to update the Higgs field coupled with a pure gauge $SU(2)$ theory through Heat Bath algorithm. Pure gauge and Higgs configurations should be updated separately. For the pure gauge part the ...
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Is spontaneous symmetry breaking (SSB) a physical process?
When you met the process of spontaneous symmetry breaking (SSB) for first time (in my case during the standard model course) they tell you the example of a (3D) ferromagnetic substance.
In the case ...
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How to couple the Higgs field with $SU(3)$ (and/or $SU(2)$) Yang-Mills theory in numerical simulations?
I'm trying to couple the Higgs field to numerical simulations of pure gauge theory with heatbath and overrelaxation update of link variables. I don't know how to insert the Higgs field into the ...
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It is said that the dual Meissner effect can explain confinement, but where is the Higgs?
It is said that the dual Misner effect can explain confinement. This refers to when the monopole field acquires a v.e.v..
The t'Hooft-Polyakov monopole arises in a theory with a Higgs. So how does the ...
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How did scientists calculate the bounds of mass of Higgs boson without measurement [duplicate]
First of all, let us write out the lagrangian of the Higgs field
$\mathcal{L}=\partial_\mu\bar{\varphi}\partial^\mu\varphi-\lambda(\bar{\varphi}\varphi-\frac{v^2}{2})^2$
This yields $m^2=\lambda v^2$. ...
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