1. ### I Probability of neutrino switching: more massive, more probable?

In Scientific American, July 2020, the article "The Darkest Particle" by Louis and Van de Water, page 46, discussing the hypothetical sterile neutrino, there is the sentence: "Because sterile neutrinos are likely to be more massive than the regular flavors, however, particles could make the...
2. ### A Neutrino decay before electroweak breaking

Most scientists believe neutrinos don't get their mass from the Higgs field due to their tiny mass compared to the next lightest particle(electron).During the electroweak epoch the rest particles were massless but neutrinos shouldn't be. The neutrinos would then decay to the other massless ( i...
3. ### A N-body simulation with varying neutrino mass

I am trying to find a picture of the N-body simulations that shows the LSS. Particularly I am looking for different neutrino masses without the CDM. For instance pictures likes this But with more varying/different neutrino masses. I am looking for articles
4. ### I Neutrino Helicity and Spin Uncertainty

In the context of non relativistic quantum mechanics, or better, if I consider the neutrino's mass to be zero, the phrase seems to me puzzling. What I know is that if I know the direction of motion, I know the spin projection onto that direction, say ##\hat{z}##-direction. But to not violate...
5. ### Neutrinos and their detection

Assuming that this sphere has a radius of 50kpc, I've converted to m (1.543e21) and plugged into the area equation for a total area of 2.992e43 m^2. From here I've talked myself into circles, and I honestly don't know where to go next. Any help or guidance would be greatly appreciated!
6. ### A Measurements and electroweak gauge invariance/transformations

Most gauge transformations in the standard model are easy to see are measurement invariant. Coordinate transformations, SU(3) quark colours, U(1) phase rotations for charged particles all result in no measurable changes. But how does this work for SU(2) rotations in electroweak theory, where...
7. ### Longitudinal distribution for a neutrino beam

In the center of mass frame of reference i found that ##p^{*}=\frac{[(M^{2}-m_{\nu}^{2}-m_{K}^{2})^{2}-4m_{\nu}^{2}m_{K}^{2})]^{1/2}}{2M}##. I don't know how to find the momentum distribution ##p_{L}(\theta)## considering that i have 2 different mesons with a specific number ratio...

17. ### I Neutrino Oscillation

If we have a beta decay where a solar neutrino is produced: a proton converts into a neutron ,emitting a W. the W decays into an anti electron and a neutrino. So in the end of the chain we have a neutrino that will travel through space and oscillate. Neutrino Oscillation happens because of...
18. ### A Do "thermal neutrinos" exist

Would neutrinos emitted in the distant and early universe be slowed enough to become thermal neutrinos? Could these be detected?
19. ### I Does the Chirality match the helicity?

In trying to understand the Neutrino where it has mass and its chirality is the same as its helicity, I have always had trouble visualizing a particle. I recently ran into this particle. I believe the "the chirality is the same as helicity" as in one direction it would feed things through the...
20. ### What is the kinetic energy of a proton when neutron decays?

Homework Statement What is the kinetic energy given to the proton in the decay of a neutron when: a) The electron has negligibly small kinetic energy b) The neutrino has negligibly small kinetic energy Homework Equations Q = (mn - mp - me - mv ) c2 = .782MeV Where T is kinetic energy, and...
21. ### Pi meson decay (relativistic momentum)

Homework Statement A charged π meson (rest mass = 273me) decays into a neutrino (zero rest mass) and a μ meson (rest mass = 207me). Find the kinetic energies of the neutrino and the mu meson. Homework Equations E = moγc2 K = mo(γ-1)c2 v = pc2/E p = moγv The Attempt at a Solution In the rest...
22. ### I I don't understand this Feynman Diagram

Question: Draw the lowest-order Feynman diagrams for the e+e- --> W+W-process The answer gives three diagrams. I understand the first two, but the third makes no sense to me. Here it is: So this is a t-channel Feynman diagram. As far as I can tell regarding how these types of Feynman...
23. ### A Flavour neutrino masses

Hello everyone! I've a question regarding the neutrino masses. When neutrinos interact they must do so in a specific flavour (e.g. e, μ,τ) and if we go to find out what their flavour is at the interaction we get a specific answer. However, it is not clear to me what we would find out if we...
24. ### Schools University of Hawaii physics PhD-neutrino physics?

Was wondering if anyone could give me some stats about the University of Hawaii. I'm tentatively looking at them for particle astrophysics or neutrino physics. Anyone know what the acceptance rate is/how hard it is to get in? Any reviews of the school? Should ranking concern me? They seem to do...
25. ### Particle Prerequisites for Giunti and Kim's Neutrino Physics

Hi, I'm a physics 2nd yr undergraduate and know some quantum physics, but I haven't been formally introduced to particle physics or QFT yet. What all do I need to learn before I start reading Giunti and Kim's Fundamentals of Neutrino Physics and Astrophysics? And which books should I refer for...
26. ### I How can photons interact if they travel at the speed of ligh

I was listening to a podcast about the solar neutrino problem, and they discussed how we have deduced that neutrinos are not massless due to the fact that they interact with other particles (even if this interaction occurs rarely). I paraphrase: "a particle traveling at the speed of light is...
27. ### A What was the explanation of OPERA superluminal neutrinos?

When I first heard about the OPERA apparent superluminal results on the measurement of neutrinos speed, I tried to locate an explanation using all the possible relativistic effects. All were too small to account for a difference of 18 meters of virtual distance among photons and neutrinos. Then...
28. ### Neutrino flavor conservation

Hello everyone, Are neutrino flavors conserved in interactions other than neutral particle oscillations?
29. ### How Neutrinos Prevent Cavities

They make fluorine, according to a large new study. Link: ScienceNOW
30. ### Neutrino Anti-Particle and Flavor Mass Hierarchy

"Other experiments to test whether the neutrino is, weirdly, its own antiparticle may be feasible only if the hierarchy is inverted." Why? http://news.sciencemag.org/physics/2015/08/u-s-neutrino-experiments-first-result-tantalizes?utm_campaign=email-news-latest&utm_src=email