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Questions tagged [electroweak]

Electroweak stands for the unification of the electromagnetism and the weak force. The unification energy scale is around 100~200 GeV, the mass scale of the Higgs boson. It is widely accepted to be formulated as a quantum field theory with gauge symmetries of U(1) symmetry in electromagnet forces and SU(2) flavor symmetry in weak forces. See also the [Wiki page](http://en.wikipedia.org/wiki/Electroweak_interaction).

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Vector-like Representation of fermions

In the literature, they often extend the Standard Model by adding a so-called vector-like fermion which is a multiplet invariant under $SU(2)_L\times U(1)$. The left- and right-handed components of ...
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Electroweak Force Capabilities

I understand that Electroweak force is the unification of Weak force and electromagnetism, but that are the actual effects or capabilities of this fundamental force? or at the very lease, what are the ...
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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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Renormalization scale dependence of S, T parameter of Electroweak precision test

In Peskin, Takeuchi(1992) paper(link), oblique parameters S and T, U are defined as (Eqn 3.12) $\alpha S\equiv 4e^2[\Pi'_{33}(0)-\Pi'_{3Q}(0)], \\ \alpha T\equiv \frac{e^2}{s^2c^2m_Z^2}[\Pi_{11}(0)-\...
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Why the rate of Z boson decays produce 3 generations of matter?

I read a tons of article about Z boson, I know it is a carrier of weak force similar to photon except it is much much more massive than an electron and it is extremely short lived. Sadly almost all ...
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Neutral vector boson from renormalizing IVB (intermediate vector boson) theory?

Consider the intermediate vector boson (IVB) theory, with the interaction Lagrangian density $$\mathcal L_I = \sum_l g_W (\overline{\psi}_{\nu_l} \gamma^\alpha(1- \gamma_5)\psi_l ) W_\alpha^\dagger + \...
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Why are the Higgs field and the electroweak field so closely related?

To my understanding, the Higgs field condensed at the same time as the electroweak symmetry was broken. The fields' doublet components merged, while the singlet components became the Higgs boson and ...
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250 views

Why can an electric chargeless Z-particle decay in three photons?

The Z-particle that is supposed to convey the weak force has no electrical charge. So how is it possible the particle can decay in three photons. Because the weak and e.m. force are more or less ...
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Understanding $ee\to h \to ff$ process

can anyone tell me where to find a good reference that talks about $$e^+ e^-\rightarrow H \rightarrow f\bar{f}$$ where this describes an electron-positron annihilation into a Higgs that in term ...
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How to theoretically determine electric charges of $W^{\pm}$ bosons?

I just realised that I don't remember how to conclude theoretically that $W^{\pm}$ bosons have electric charges of $\pm 1$. After some searching I'm quite surprise that I couldn't find a satisfying ...
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375 views

Off-shell corrections to massive vector boson propagator in polarization form

As an exercise for myself, I have been working on rewriting the massive vector boson propagator (unitary gauge). I have run into a problem interpreting some of the terms that stick around when the ...
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What do we mean with spontaneous symmetry breaking $SU(2) \times U(1) \to U(1)$ in particle physics?

I think my problem is with group theory. I understand that within the Standard Model the Lagrangian is invariant under $SU(2)_{L}\times U(1)_{Y}$ symmetry, but I do not understand what we mean (...
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275 views

Invariance under charge conjugation… Or not?

I have read some paper which says that the electroweak Lagrangian includes these terms like $\bar{\psi} \gamma_a\gamma_5\psi$ and $\bar{\psi} \gamma_a \psi$. They violate charge conjugation symmetry. ...