6 votes

How can I understand neutrino mixing and the difference between flavour and mass eigenstates?

Another source that could help you is the video from minute physics: https://www.youtube.com/watch?v=7fgKBJDMO54. He distinguishes the types of neutrinos in interaction (flavor eigenstates) and ...
Léo Vacher's user avatar
4 votes
Accepted

What particles are described by the Klein-Gordon Equation?

A real (hermitean) Klein-Gordon field describes chargeless spin $0$ bosons. Examples: $\pi^0$, Higgs. A complex (non-hermitean) Klein-Gordon field describes charged spin $0$ bosons, where the "...
Hyperon's user avatar
  • 4,592
3 votes
Accepted

What is the difference between a meson and quarkonium?

Mesons consist of quark-antiquark pairs, so inherit their flavor from those, additively. From WP, you learn that The third component of isospin $I_3$, 1/2 for the up quark and -1/2 for the down ...
Cosmas Zachos's user avatar
2 votes
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Kinematics in the pion decay

Of course charged pion decays involve the exchange of virtual Ws, like all low-energy weak interactions. As you may have learned in your introductory HEP course, charged pions are the longest-lived ...
Cosmas Zachos's user avatar
2 votes

Why do negative charge parity exchanges couple differently to proton and antiproton?

The interactions are strong, interactions that preserve C. So the "target" vertex parts of the exchange diagram in the two reactions must differ by a sign, $$C|p\rangle = |\bar p \rangle ,...
Cosmas Zachos's user avatar
1 vote

What particles are described by the Klein-Gordon Equation?

The Klein-Gordon equation is the field version of the special relativistic energy momentum relation. When one abandons the restriction that it should only be used for scalar fields it becomes clear ...
my2cts's user avatar
  • 23.8k
1 vote

Do all antiquarks carry and anti-color charge, or can they carry RGB color charges as well?

Antiquarks always carry anti-color charges, not the RGB color charges associated with quarks. Therefore, list one is correct: Quarks have RGB color charges with electric charges of +2/3 or -1/3. ...
cconsta1's user avatar
  • 285
1 vote

Understanding the Mixing Parameters in the PMNS Matrix

With Wikipedia, let me skip the 4th matrix, diag$(e^{i\eta_1}, e^{i\eta_2},1)$, factor of the full 3×3 PMNS matrix (14.33) of the PDG review, so consider the CKM-like matrix as though the neutrinos ...
Cosmas Zachos's user avatar
1 vote

How can I understand neutrino mixing and the difference between flavour and mass eigenstates?

Good morning. I am unaware of the exact prior level of knowledge possessed by your listeners, but I would proceed as follows: Before discussing self-state and oscillation itself, I would focus on the ...
Gorga's user avatar
  • 65
1 vote
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Imaginary Contribution to Diagrams with one $\gamma^5$ Vertex

the matrix element squared must be a real number No, it doesn't, but the modulus of the matrix element squared, $|\mathcal{M}|^2 = \mathcal{M}^\dagger\mathcal{M}$, does :)
mdi's user avatar
  • 353

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