All Questions
77
questions
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73
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Is there a Higgs-pole like the $Z$-pole?
Why isn’t there studies of direct Higgs production like for the $Z$ boson?
Looking for future colliders, they all aim for
$$e-e+ -> HZ $$
which for me makes sense for measuring a physical Higgs but ...
2
votes
1
answer
65
views
Field redefinitions in the Higgs mechanism
Consider the Higg's mechanism for a simple $U(1)$ theory. Leaving aside the lagrangian which consists of a kinetic term for the gauge field, a covariant derivative term and the potential term for the ...
- 1,791
1
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0
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53
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?
1
vote
2
answers
122
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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 ...
- 161
0
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1
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146
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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 $...
- 1,410
-1
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1
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135
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Hey there I'm a beginner in particle physics trying to "selfstudy" from online resources. I want to ask how much of what I learned is correct? [closed]
The information I have gained thus far regarding the standard model is;
fermions and how their intrinsic nature.
they have half spin, non zero mass, a charge, a weak hypercharge (for leptons), a ...
4
votes
1
answer
117
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$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 ...
- 1,783
0
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1
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79
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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 ...
- 659
0
votes
2
answers
77
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Scalar field components in unitarity gauge
The Wikipedia article on Unitarity gauge says - "In this gauge, the scalar fields responsible for the Higgs mechanism are transformed into a basis in which their Goldstone boson components are ...
- 343
1
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0
answers
312
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Spontaneous Symmetry Breaking / Explicit Symmetry Breaking [closed]
I'm trying to understand the SSB and explicit symmetry breaking.
If we have a complex scalar field theory with Mexican hat potential,
$$\phi(x)=\frac{\sigma(x)}{\sqrt{2}}e^{i\Pi(x)/v}$$
choice of the ...
- 3,464
1
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137
views
If we had a Higgs triplet with hypercharge $Y=1$, would we get three Higgs bosons?
In the Standard Model, the Higgs field is a doublet of SU(2) and hypercharge $Y=1/2$. We have four real scalar degrees of freedom (since $H$ is a complex doublet); three of these get "eaten" ...
- 61
-2
votes
1
answer
159
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Are the particles in the zero-energy Higgs field real or virtual?
We all know that in particle physics the vacuum state is the state with no real particles. Unless the vacuum has the least energy with particles, because the degenerate vacuum, lowest energy state ...
-1
votes
1
answer
145
views
Does the Higgs field have an energy?
I have many questions about the notion of space. I learned that at the quantum level, energy became quantized and that the infinite sum of energy states can no longer be substitued by integrals (...
- 220
2
votes
0
answers
118
views
Tadpole VEV from a fermion loop?
We have one extra complex scalar $\Phi$ beyond the Standard Model (BSM) protected by an $U(1)$ global symmetry, which is broken by an Yukawa coupling $ y_\Phi \Phi \overline{\chi} \chi$, where $\chi$ ...
- 21
2
votes
1
answer
97
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Higgs particle elementary? [closed]
The Higgs boson was observed in 2012 and is known to be a fundamental particle in the standard model, but it could be that it is not fundamental/or it consists of other particles? So my question is, ...
- 23