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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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Is Higgs mechanism generate mass parameter? Or physical mass?

Is Higgs mechanism generate mass parameter in the Lagrangian? Or physical mass that we can observe in experiment? It is obscure for me how Higgs mechanism produce mass for elementary particle. ...
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How do know that Goldstone Boson actually become the longitude degrees of freedom in W+,W- and Z boson?

In many Quantum Field Theory text books they says these about Spontaneous Breaking and Higgs mechanism like this In unitary gauge, the Goldstone Bosons are eaten by $W^\pm$ and Z and become their ...
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Symmetry breaking with Kinetic term dominating the Potential on a Lagrangian

Suppose a Lagrangian $L$ for a scalar field $\phi$, consists of a kinetic term and a Mexican-hat type potential. I am aware that if the vacuum has symmetry $H \subset G$ while the Lagrangian has ...
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Is the electroweak $SU(2)$ gauge symmetry an exact symmetry in Standard Model before spontaneous symmetry breaking?

In Standard model, components of a $SU(2)$ doublet (for example $u$ and $d$) have different masses. This means there is no $SU(2)$ symmetry, but I think it is okay because the $SU(2)$ symmetry is ...
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Could the Higgs detection have been a mini black hole?

Is it a possibility that the detection of the Higgs boson was in fact a miniature black hole. Given that the decay products of the Higgs boson were two gamma ray photons and that black holes are also ...
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Hierarchy problem and loop quantum gravity

According to https://en.wikipedia.org/wiki/Hierarchy_problem#Finite_Groups. Hierarchy problem can be theoretically solved using symmetry of certain bosonic string theory on the Leech lattice (though ...
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Given the transformation of $SU(2)$ triplet $\vec{\phi}$ how to find the transformation of ${\Phi}\equiv\vec{\phi}\cdot\vec{\tau}$?

Given the transformation of a $SU(2)$ triplet $\vec\phi$ $$\phi\to \exp{(-i\vec{T}\cdot\vec{\theta})}~\vec\phi\tag{1}$$ (in the question here by @physicslover) how does obtain the transformation of $\...
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Counting degrees of freedom in the Higgs mechanism for different gauges

I am wondering how to count the degrees of freedom (dof) for a massive gauge field in different gauges. I've been reading some other answers, but haven't found a solution yet. I am looking at the ...
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Like the Higgs sector of the standard model, is there a SUSY sector which is also such a sector?

This question arose from an application of the virial theorem that showed how Bose-Einstein condensates of astrophysical dimension could arise from condensing clouds of normal phase bosons. If these ...
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How does something start interacting with the Higgs field?

When two high energy photons are smashed together they create a matter-antimatter pair. The photons do not interact with the higgs field, but when they convert into matter-antimatter pair, they start ...
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What are significant applications of the Higgs Boson itself in the standard model?

I understand that the Higgs Field grants mass to all the matter in the universe, and is equally distributed in all parts of it, but it was the Higgs Boson that was discovered at the LHC, and ...
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Rest frame of massive photon in Meissner–Ochsenfeld effect

The Meissner–Ochsenfeld effect together with spontaneous symmetry breaking and the London Equation yields $(\Box+M^2)A^\mu=0$ and gives photon an effective mass $q\sqrt{\frac{n_c}{m_c}}$ Which is ...
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Interacting Quantum Fields in Curved Spacetime

I was thinking this night that how would the fields interaction or the vacuum expectation value of Higgs field changes when spacetime is not flat? e.g., the higgs field interact with the electron ...
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If the Higgs field was densified a little more, can the physical constants such as Planck Values be changed?

According to theory, the Higgs field is at everywhere in the space. So that, the mass is existing by interaction of energy (in some way) with this field. And according to this the space vacuum has an ...
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Higgs field interactions [duplicate]

Where does the Higgs field get the energy which it transfers when some particles interact with it? And how do these interactions give mass to other bodies?
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Has quantum mechanics been able to define the centre of a black hole? [closed]

It is said that quantum mechanics has defined everything we observed everything so far, but did it predict the existence of the Higgs Boson beforehand and has it been able to define the Singularity?
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Higgs field can stop interaction with fermions?

I heard that, at super high energy, the Higgs field stops interacting with the weak force and that is the reason the electromagnetic and weak force become one (and similarly with the strong force). ...
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What happened to particles travelling at light speed at the instant the Higgs ocean formed?

Reading the Fabric of the Cosmos (Brian Greene) where he mentions, during the big bang, the Higgs field was undergoing fluctuations at a temperature too high to form the Higgs ocean. It implies that ...
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Higgs Doublet Transformations

If we consider two complex Higgs doublets with $SU(3)_{c} ⊗ SU(2)_L ⊗ U(1)_Y$ quantum numbers $\phi_{A,B}$ ∼ (1,2,1), such that $\phi_A = \begin{pmatrix} \phi_{A}^{\dagger}\\ \dfrac{1}{\sqrt2} (Re \...
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What dictates how the Higgs boson will decay?

As far as I know the higgs boson has been observed to dacay into gamma ray photons, the Tau, b quark and maybe top quarks. But what are the factors that govern what particles it will decay to? And are ...
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Mass of the electron

In the classical limit, three quarters of the mass-energy of the electron come from the energy of the electromagnetic field of its charge (see Electromagnetic Mass). Intuitively one would expect that ...
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What is the educational path to properly understanding the Higgs Boson? [duplicate]

I want to understand the Higgs Boson. Not in terms of analogies and metaphors, but in terms of hard math. Assume I have a solid background in pre-university maths and physics. (I have many bits and ...
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Why are fermion masses considered free parameters of the standard model rather than Yukawa coupling constants?

From what I understand, fermion masses in the standard model are due to Yukawa couplings to the Higgs field. Nevertheless, when listing free parameters of the standard model it is the fermion masses ...
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Does the Higgs field also bend in gravitational space-time fields?

I hope I'm formulating this correctly: if the Higgs field is responsible for generating particle mass by interaction, does it bend in/around the gravitational space-time of amassed particles "given" ...
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Does Higgs field exert pressure which contributes to the stress-energy tensor causing gravity?

First of all, I have never studied quantum field theory. Since Higgs field is a scalar field, does Higgs field also exert positive/negative pressure which contributes to the stress-energy tensor ...
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How did the three quarks ($u, d, s$) acquire different masses?

If the three quarks $u, d, s$ had the same mass, they would have an $SU(3)$ flavor symmetry ($u, d, s$). This symmetry is broken because these three quarks have acquired different masses through ...
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Dynamics in Higgs mechanism

In "everyday" particle physics, we assume the $ SU(2)_L \times U(1)_Y $ is spontaneously broken to $ U(1)_{EM} $. But in high enough energies the symmetry is restored, otherwise as far as I understand ...
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How are computed Branching decay modes (for Higgs boson and from a general point of view)

I would like to know how are computed the branching decay diagram, like for example with Higgs boson represented below (source): It seems there are 5 ways of decays for Higgs boson. I suppose there ...
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Velocity and mass and particles

If mass increases as velocity increases how can I associate this with the fact that some particles such as neutrinos which barely have no mass, go faster when they have less mass or less interaction ...
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Higgs Mechanism and Wave-Particle Duality

According to Higgs Mechanism a particle acquires mass when it couples to the higgs field. Now consider Wave-Particle Duality. Suppose I am doing a Young's Double Slit Experiment using electrons. When ...
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Are elementary particles with inertial mass actually composite particles?

In the standard model, electrons, muons and taus are elementary particles i.e. they aren't composed of more fundamental particles. But after watching this YouTube video animated by an actual scientist,...
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Why does the covariant derivative not affect the vacuum expectation value of the Higgs field?

Consider the following Lagrangian density: $$ \mathcal{L}_{1} = (\partial_{\mu}\phi^{*})(\partial^{\mu}\phi)-m^{2}\phi^{*}\phi-h(\phi^{*}\phi)^{2} $$ for the complex scalar field $\phi$ with $h>0$. ...
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Higgs wave experiment?

I have read these questions: Is the Higgs Boson like a wave made in the pool? An electron is an excitation of the electron field. So when we observe a higgs boson that means we've excited the ...
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Gauge symmetry and symmetry breaking?

In quantum field theory we say that gauge symmetry is a redundancy, and also, in Xiao-Gang Wen's book, it reads that gauge symmetry is not a symmetry, so it can never be broken. And the Higgs ...
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Decomposition of Higgs Potential into Doublet Components

I am having trouble understanding the following calculation from a textbook on symmetry: There, the Higgs potential is defined as $V(\Phi) = -\rho^2 \Phi^{\dagger}\Phi + \lambda (\Phi^{\dagger}\Phi)^...
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Higgs is neutral but decays into photons-Why?

Higgs is neutral and therefore cannot have electromagnetic interactions. Then how can it decay into a pair of photons? Does it mean that particles need not be charged to have electromagnetic ...
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What will happen to a black hole if the Higgs field at the singularity is turned off?

At high enough temperature the Higgs field VEV becomes zero (around $10^{15}~\rm K$ or so). Suppose the singularity reaches such a temperature, will all the mass vanish? What will happen then? Note ...
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Higgs branching ratios oddity

In reviewing some general articles on theoretical Higgs branching ratios it appears that, other things being equal, more massive decay products are favored over less massive ones. (Bottom quark pair ...
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Higgs couplings and fermion masses

As far as I understand, the Higgs mechanism is a crucial component of the standard model, which is responsible for the weak gauge bosons acquiring mass, otherwise forbidden by renormalizability ...
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What gives mass to dark matter particles?

Assuming that dark matter is not made of WIMPs (weakly interacting massive particles), but interacts only gravitationally, what would be the possible mechanism giving mass to dark matter particles? If ...
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Does an accessible experiment exist that would distinguish QED vs. EW/Higgs originated masses as having different properties for them?

Subject to SM being found inadequate,iIt's well known that some particles gain mass from the Higgs field/mechanism (EW bosons being classic examples) while others gain mass from gluon energy and QED (...
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Why can't the Higgs be produced with a single gluon?

In the PDG there are 4 important production mechanisms listed (page 11). Why is it that for the first and fourth mechanism a second gluon is needed? For the first one, why can't the gluon decay into ...
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Do electrons also gain mass by interacting with the EM field or all of its mass comes from the interaction with the Higgs field?

I'm confused. I thought that the only reason why electrons had mass was that they interacted with the Higgs field, but I've been told that the EM field also contributes to its mass. However, if this ...
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Can Higgs mechanism happen in 1+1D?

How I understand the Higgs mechanism is that, although it is called “spontaneously breaking of the gauge symmetry”, the gauge symmetry is actually not broken in the higgs mechanism and it is the ...
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How would you explain the Higgs Mechanism to a kid? [duplicate]

I am currently studying the Electroweak Symmetry breaking and the Higgs Mechanism and I am wondering how could I explain it to a kid or my grandpa. How would you describe the mechanism and its ...
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What would be the next approximate stable value of Higgs VeV after 246 GeV, assuming that it's metastable?

Based on the top mass, the Higgs boson mass and assuming that there is nothing beyond the standard model, what is the approximate next stable vev of the Higgs field if the field is in a metastable ...
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Higgs measurements at the LHC

The Higgs boson has been measured by CMS and ATLAS at the LHC, but I was wondering wether they used the same decay channel to measure it or not (for me, in the latter case, the measurement would be ...
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Higgs self-coupling and vacuum stability

I am new to this topic, so I do not have much knowledge of these. When discussing vacuum instability in QFT, higgs self-coupling becoming negative at high-energy scale when renormalized is said to ...
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Self-coupling Higgs boson and composite Higgs models

I'm currently doing my Bachelor Thesis about the Higgs boson and I've read that there are new models which describe the Electroweak Symmetry Breaking considering the Higgs boson as a composite ...
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Does vacuum has another meaning from quantum vacuum?

According to QFT. The quantum vacuum is a particular state of quantum fields; it's not a "place" where quantum fields "exist in. No problem with that. But does the word "vacuum" without the quantum ...