Skip to main content

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.

Filter by
Sorted by
Tagged with
-1 votes
1 answer
42 views

Significance of the phase of the condensate as compared to that of the regular Fermi sea in the Anderson-Higgs mechanism

I do not fully understand how the phase of the charged Cooper pair condensate is different from the phase of e.g. the Fermi liquid in a regular metal. The state of the metal (any quantum state really) ...
Rooky's user avatar
  • 11
1 vote
1 answer
72 views

Superconducting ground-state and Higgs mechanism

I found this article on spontaneous symmetry breaking in superconductors. Using the same arguments as Weinberg, the author demonstrates that the properties of a superconductor are the consequences of ...
Jean's user avatar
  • 162
1 vote
0 answers
52 views

Is the Higgs sector in the Standard Model also asymptotically free?

I have always thought that the Higgs sector, which is $\phi^4$ theory in essence, is not asymptotically free. However, I ran into the following statement from this paper: The standard model is, in ...
Keith's user avatar
  • 1,441
0 votes
1 answer
54 views

$W$ and $B$ bosons when choosing a different minimum of the Higgs doublet

When comparing the experimental phenomenology with the standard model, one usually takes a combination of the $W^a_\mu$ and $B_\mu$ gauge bosons to obtain the physically observable ones ${W^+}_\mu$, ${...
SrJaimito's user avatar
  • 601
1 vote
0 answers
49 views

Why can't other bosons fluctuate up the potential curve and gain mass?

If a Higgs boson is able to gain mass by fluctuating up the Mexican hat potential, what stops other bosons from doing the same thing and gaining mass without the need of the Higgs mechanism?
thingthingthing123's user avatar
1 vote
2 answers
111 views

Confusion about Higgs mechanism

I am trying to understand the mass acquisition of particles in the Standard Model based on the book 'Fundamentals of Neutrino Physics and Astrophysics' by C. Giunti, and several doubts have arisen ...
Gorga's user avatar
  • 161
0 votes
2 answers
113 views

Gauge boson interacting with derivative of the Higgs field

Consider the $\mathrm{SU}(2)\times \mathrm U(1)_Y$ Lagrangian $$ \mathcal L=-\frac{1}{4} (W^a_{\mu\nu})^2 -\frac{1}{4} B_{\mu\nu}^2 + (D_\mu H)^\dagger (D^\mu H) +m^2 H^\dagger H -\lambda (H^\...
Liu Zhiyu's user avatar
1 vote
2 answers
191 views

Why did Peter Higgs, et al. suspect that the $W$ boson(s) had mass? All the way back in 1963, '64?

I cannot understand why so many people (the PRL Symmetry authors) were so sure that the weak interaction particles had mass. The gluon, for instance, and its attendant strong force are also very short ...
Kurt Hikes's user avatar
  • 4,435
0 votes
1 answer
65 views

Custodial symmetry of the standard model symmetry group $SU(2)_L \times SU(2)_R$

I am studying the standard model including the Higgs sector and electroweak interactions. Here, all of my terms have their usual meanings. Therefore my symmetry group is $SU(2)_L \times SU(2)_R \times ...
Chris G's user avatar
  • 51
0 votes
1 answer
48 views

Different representations of the Yukawa interaction

during studying Yukawa sector of the SM, I got confused with different reps of the Yukawa interaction. First, this is what I am familiar with(let me show only electron mass term): $$y_e \bar{L}_e H ...
김승현's user avatar
3 votes
1 answer
74 views

How to find the full global symmetry group of a Lagrangian of $N$ complex scalars?

I have the Lagrangian $$ \mathcal{L} = \frac{1}{2}D_\mu \Phi^\dagger D^\mu \Phi - \frac{m^2}{2} \Phi^\dagger \Phi - \frac{\lambda}{4}(\Phi^\dagger \Phi)^2 - \frac{1}{4}F_{\mu\nu}F^{\mu\nu} $$ where $\...
Niels Slotboom's user avatar
0 votes
0 answers
17 views

How low can the scale of cosmological inflation be?

Usually, when we think of inflation we think of it happening at high energy scales, close to the bound set by CMB polarization measurements (with a Hubble scale of $H_I\sim 10^{14}$ GeV). However, ...
illa_94's user avatar
  • 11
0 votes
1 answer
40 views

Can we prevent the Higgs field interaction with particles? [closed]

if not why? is it possible in future? Because if it is possible there may be chance of more advance invention
BHAVAN KUMAR P MECH's user avatar
0 votes
0 answers
21 views

Understanding Fermion-Antifermion Transitions through Higgs Field Interaction

I understand that the vacuum expectation value (vev) of the Higgs field has changed, resulting in a nonzero energy value throughout space. It takes the shape of a Mexican hat, with its minima less ...
Julián Oviedo's user avatar
0 votes
2 answers
98 views

Detection of the Higgs-Boson Graph Interpretation

I am reading up on the detection of the Higgs-Boson at the LHC and more specifically at CMS. I found the following graphic: I understand that the peaks correspond to the mass of the Higgs-Boson but I ...
Tuhande's user avatar
  • 11
1 vote
3 answers
177 views

Does most of the Universe's mass come from pions (or 'virtual' pions) rather than gluons and quarks?

After the discovery of the Higgs boson, we were all told that most of a proton's or neutron's mass does not actually come from their three main ('valence') quarks and their interaction with the Higgs, ...
Kurt Hikes's user avatar
  • 4,435
2 votes
0 answers
40 views

$hh \to hh$ scattering

I'm trying to compute the double Higgs scatter in QFT framework. Is it correct if I use the scalar propagator for this process? Also I've found that I've four possible diagrams: the three $s,t,u$ ...
Lip's user avatar
  • 41
4 votes
0 answers
195 views

How does Garrett Lisi's $E_8$ Theory contain the Higgs Boson and Graviton?

How does Garrett Lisi's "Exceptionally Simple Theory of Everything" contain the Higgs Boson and Graviton? Let's say that $E_8$ breaks down like this: $$E_8 \rightarrow E_6 \times SU(3).$$ ...
AdvilDuttay's user avatar
0 votes
1 answer
124 views

$SU(2)$ breakdown to $U(1)$

When we break a lagrangian symmetric with $SU(2)$ with a higgs bosons being the adjoint representation, using the following v.e.v for higgs $\phi$, $$\langle \phi \rangle = (0,0, \rho)^T.$$ Two ...
LSS's user avatar
  • 980
0 votes
0 answers
20 views

What is the difference between density and lowest energy states for Higgs field?

The density of the Higgs field is zero everywhere in the universe despite the fact that the expansion of space is accelerating, and then the lowest energy states on average for the higgs field is non-...
user6760's user avatar
  • 13k
0 votes
1 answer
53 views

Is the weak quark mixing a consequence of electroweak symmetry breaking?

Because of the CKM matrix, the quark doublets that are changed by $W^{+}$ and $W^{-}$ include a linear combination of quark flavours, instead of the pure quark flavours. I was wondering if, before ...
TrentKent6's user avatar
-2 votes
1 answer
106 views

Why do the members of $SU(2)$ doublets gain different masses after spontaneous symmetry breaking?

Before spontaneous symmetry breaking (SSB) elementary particles belonging to the same $SU(2)$ doublets are indistinguishable, which clearly is not the case after SSB. I am comfortable with the idea of ...
TrentKent6's user avatar
0 votes
0 answers
76 views

Anderson Higgs mechanism and superconducting phase fluctuations

In the context of superconductivity, in the Anderson Higgs mechanism (see, for instance, https://doi.org/10.1119/1.5093291 (PDF), or https://doi.org/10.21468/SciPostPhysLectNotes.11 (PDF), the gauge-...
evening silver fox's user avatar
1 vote
0 answers
45 views

Topological current in (2+1)D spinorial electrodynamics

Giving the coupled Dirac equations for $\psi$ and its conjugate $\bar{\psi}$ in 2+1: \begin{align} (i\gamma^\mu\partial_\mu-m)\psi&=qA_\mu\gamma^\mu\psi,\\ \bar{\psi}(i\gamma^\mu\partial_\mu+m)&...
Steven Perez's user avatar
2 votes
1 answer
56 views

Nonconservation of hypercharge in Higgs decay

From Wikipedia, Higgs boson has hypercharge of +1 and isospin of -1/2. W bosons have hypercharge 0 and isospin +-1. Now Higgs boson can decay into 2 W bosons of opposite electric charge. No matter how ...
haael's user avatar
  • 203
3 votes
1 answer
131 views

Question about mass of particles given by the Higgs

The higgs basically gives mass, or adds an interaction that looks like a mass, by introducing a term in the hamiltonian of the kind $$L_{int}=gH\psi^2,$$ where $gH$ looks like the mass of the quanta ...
Pato Galmarini's user avatar
0 votes
0 answers
49 views

Identification of $W$ and $Z$ mass terms in SSB and Unitary Gauge

I have two questions, both relating to the SSB of Electroweak Lagrangian. My notes say that after breaking and expanding around the VEV, the masses of $W$ and $Z$ are identified by comparing to the ...
Blazeboy01's user avatar
-1 votes
3 answers
275 views

What is the difference between mass gained from the Higgs field and relativistic mass gain?

I understand the equation for mass gain in special relativity, but what is physically causing the mass increase? In Higgs theory, mass is said to come from the vacuum potential (VEV). I am assuming ...
user avatar
2 votes
0 answers
38 views

Understanding $\mathscr{L}_Y^{\text{down} }=-\sqrt{2}\sum _{a,q}\overline{\psi }_{iL}Y^{\text{down} }_{iq}q'_RH+\text{h.c.} $

Currently reading Bilenky's "Introduction to the Physics of Massive and Mixed Neutrinos." (2nd ed.) On page 56 (Section 3.4 on the Standard model) elaborates "Let us assume that in the ...
Fernando Garcia Cortez's user avatar
1 vote
1 answer
94 views

Spontaneous Symmetry Breaking and/or Higgs Mechanism, WIthout Field Redefinition

In all explainations of spontaneous symmetry breaking that I've seen, the scalar field doing the breaking is redefined around its vacuum expectation value (VEV), and similarly for the higgs mechanism -...
Leuca Patmore's user avatar
0 votes
1 answer
98 views

${}$Higgs mechanism

Is is correct to say that, elementary particles have different masses, because they have different coupling strengths to Higgs field? And if yes. Does it make sense to question, why they have ...
Arjun Bindra's user avatar
0 votes
0 answers
66 views

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 ...
PhysicsNoob's user avatar
1 vote
1 answer
50 views

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 ...
Lexorde's user avatar
  • 119
1 vote
1 answer
108 views

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 ...
18th Shard's user avatar
1 vote
0 answers
41 views

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 ...
J_P's user avatar
  • 233
1 vote
1 answer
51 views

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 ...
Keith Chaney's user avatar
0 votes
1 answer
131 views

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 $...
Tom's user avatar
  • 1,218
2 votes
1 answer
205 views

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 ...
user267839's user avatar
  • 1,375
2 votes
0 answers
54 views

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&...
SgtJohn74's user avatar
2 votes
1 answer
123 views

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 ...
Joseph_Kopp's user avatar
1 vote
0 answers
38 views

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 ...
Davius's user avatar
  • 1,610
-4 votes
2 answers
93 views

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 (...
Markoul11's user avatar
  • 4,099
-5 votes
1 answer
117 views

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?
Markoul11's user avatar
  • 4,099
-1 votes
1 answer
133 views

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 ...
Aditya PDJ's user avatar
0 votes
2 answers
250 views

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 ...
Random34544's user avatar
0 votes
0 answers
59 views

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. ...
secondquark's user avatar
2 votes
0 answers
52 views

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 ...
Logan J. Fisher's user avatar
3 votes
0 answers
83 views

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 ...
Mitchell Porter's user avatar
0 votes
3 answers
106 views

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 ...
blacktopshaman's user avatar
3 votes
2 answers
132 views

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 ...
Lain's user avatar
  • 347

1
2 3 4 5
23