# Tag Info

Neutrinos and antineutrinos are indistinguishable by most of their qualities, butt not all. One of the quantities that distinguish them is exactly the lepton number, which make them interact with other particles in a different way. For example, a neutrino can take part in the reaction $$n + \nu_e \rightarrow p^+ + e^-$$ but antineutrino can't; on the other ...
This seems to be a rather complicated issue. The earliest source I've been able to find proposed the existence of a muon counterpart to the electron neutrino is Sakata & Inoue's On the Correlations between Mesons and Yukawa Particles, published in English in 1946 but formulated several years prior. They postulated the existence of a charged meson $m^{\pm}... 6 So my real question is, do any of the extension of the SM to add neutrino mass signal new physics? What does even count as new physics? I think it would be something like a fifth force. Not sure what the general agreement is on "new physics". Your question is opinion based, and there is no solid answer to it. Lots of question on this site address ... 3 Since there is no way to tell neutrinos and antineutrinos apart There is. Neutrinos are distinguished from antineutrinos since they have opposite signed lepton number and opposite chirality relative to each other. They were also first detected in 1956 as part of an experiment to first detect neutrinos. does conservation of lepton number make any sense? ... 3 I may have found it. I'm quoting Wiki's article on Schoichi Sakata: Sakata and Inoue proposed their two-meson theory in 1942.[3] At the time, a charged particle discovered in the hard component cosmic rays was misidentified as the Yukawa’s meson ($\pi^\pm$, nuclear force career particle). The misinterpretation led to puzzles in the discovered cosmic ray ... 1 Nobody knows. Like photons and the Z boson, neutrinos could be their own anti-particle. It would be the only fermion[*] to be like that and would be called a Majorana fermion. However, neutrons are not their own anti-particles despite having no electric charge. Anti-neutrons are made of anti-quarks and annihilate with normal neutrons. Neutrinos could be ... 1 Is it possible to calculate how many photons can change their wavelength Photons do not have wavelength , just energy = to h*nu, where nu is the frequency of the classical electromagnetic light, the laser light. Photons can scatter off various particles and if the scattering is inelastic, a new photon goes off. in neutrino - photon interaction if any? ... 1 I am too low on reputation to comment, so I post it as an answer. This is not my field of expertise (at all!) but I came across an idea that seems similar. Also here: Wick rotation connects statistical mechanics to quantum mechanics by replacing inverse temperature$1 / ( k_B T )$with imaginary time$it/\hbar\$." Maybe this can lead someone to an ...