Where Are These Particles Found?

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Where are the following particles found:

Electron neutrino?
Muon neutrino?
Tau neutrino?
Muon?
Tau?
 
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Neutrinos
Muons
Tau
Long explanations about the particles.

Short version:
Neutrino types: Everywhere
Muons: As product of high-energetic collisions, for example in the upper atmosphere, from which muons can reach the surface too. In particle physics experiments, they are produced in large amounts, too.
Tau: As short-living product in high-energetic collisions, and only very close to them (~micrometers to millimeters)
 

Thread 'Toponium Discovered'

Toponium is a hadron which is the bound state of a valance top quark and a valance antitop quark. Oversimplified presentations often state that top quarks don't form hadrons, because they decay to bottom quarks extremely rapidly after they are created, leaving no time to form a hadron. And, the vast majority of the time, this is true. But, the lifetime of a top quark is only an average lifetime. Sometimes it decays faster and sometimes it decays slower. In the highly improbable case that...
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Thread 'Dirac-Delta from Normalization of Continuous Eigenfunctions'

I'm following this paper by Kitaev on SL(2,R) representations and I'm having a problem in the normalization of the continuous eigenfunctions (eqs. (67)-(70)), which satisfy \langle f_s | f_{s'} \rangle = \int_{0}^{1} \frac{2}{(1-u)^2} f_s(u)^* f_{s'}(u) \, du. \tag{67} The singular contribution of the integral arises at the endpoint u=1 of the integral, and in the limit u \to 1, the function f_s(u) takes on the form f_s(u) \approx a_s (1-u)^{1/2 + i s} + a_s^* (1-u)^{1/2 - i s}. \tag{70}...
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