All Questions
Tagged with standard-model electroweak
218
questions
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51
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What force or field is associated with the weak hypercharge?
So what is the force or field associated with the weak hypercharge in post-SSB?
1
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1
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60
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Does electroweak theory have mass gap (not just Higgs mechanism)?
I am extremely confused by seemingly contradictory statements.
In this PE answer, the electroweak sector in the Standard Model does NOT have a mass gap (or at least not observed). In fact, the gauge ...
- 1,669
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40
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Regarding vanishing of a triangle diagram
Furry's theorem ($C$ symmetry) is very important in calculations in QCD, Electroweak theory. Primarily it says everything about QED (three photon triangle diagram), but can be extended to QCD, and ($Z$...
- 534
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58
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$W$ 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 ${W^+}_\mu$, ${...
- 601
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52
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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 ...
- 47
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48
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Furry's theorem in Electroweak and strong interactions
We can think of Furry's theorem as the consequence of $CP$ invariance of $QED$. For parity, the vector bilinear changes sign, hence, under charge conjugation, it should. The vacuum is $C$-invariant, ...
- 534
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68
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Why are $W$ and $Z$ bosons called 'intermediate' vector bosons?
What does the 'intermediate' part mean? Somehow, I thought an answer would be easy to come across, but I have yet to find one.
- 4,509
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96
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How was the tau lepton predicted?
I know the tau lepton has been predicted before it was discovered – unlike the muon. But how does our theory (SM/electroweak theory) predict the existence of a third lepton generation?
- 11
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56
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$W$ vs $Z$ Boson Interaction
My apologies for the simplicity of this question, but I am learning how to analyze basic particle interactions.
My rationale is the following: The output and the input are both leptons, which means ...
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1
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58
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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 ...
- 454
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217
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Gauge Boson Self-Interactions with covariant derivative
Self-Interactions of the unphysical gauge bosons $W_1, W_2, W_3$ are written within the gauge term
$L_\mathrm{Gauge}=-\frac{1}{4} W_{\mu \nu} W^{\mu \nu}$
with $W_{\mu \nu}= \partial_\mu W_\nu - \...
- 15
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1
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100
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Inverse muon decay on Mandl shaw- Help on $W$ boson propagator
Hello, I cannot understand why here the other term of the propagator of $W$ boson $k^{\alpha} k^{\beta}/m_{W}^{2}$ is not present, and how/if this absence is linked to the fact that we neglect terms ...
- 11
2
votes
1
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58
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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 ...
- 203
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50
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Why is the fermionic sector of Standard Model the way it is? [closed]
"Because it works!" will be considered too broad an answer. I want to precisely know which experiments forced to consider the model construction the way it is. For example, I can see Wu's ...
- 785
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56
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Can two $W$ bosons convert a proton into an antiproton by becoming two $W^+$ bosons?
Would this process have been more or less likely in the high energy conditions around the time of the big bang?
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