Neutrino Definition and 390 Threads

Hi all! This question concerns flavour changing oscillations. Let's narrow it down to the neutrino case, where we have additionally the violation of lepton numbers. So electron and muon neutrinos naturally follow the relativistic Dirac equation: (p\!\!\!/ + m_e ) \nu_e = 0 and (p\!\!\!/ +...

What are the lowest energy transmutation caused by a neutrino and an antineutrino respectively?

All the Feynman diagrams I have seen so far for a neutron colliding with a neutrino have a w+ with an arrow from the neutrino to the neutron. Would it not also be possible with a W- leaving the neutron taking away negative charge for it to become a positive proton or is there some quantum rule...

Is there something like a "neutrino spectrum"?. Would it be analog to light spectrum?. Sorry for the ignorance, just curious. AGZ

Greetings, The IceCube neutrino detector array in the antartic is a cubic kilometer and has deceted about 28 neutrinos from outside the solar system. So the resolution is almost nothing. I am wondering how large a detector array would have to be to serve as a telescope to observe what I am...

If a neutrino beam passes through an optics lens in principle does the matter in the lens focus the neutrino beam granted it may be ridiculously small amount? If the lens were instead made of compressed matter of nuclear densities would the answer change much? Thanks for any help!

I'm currently doing a report on 'Neutrino Oscillations and mass'. I have spent today just trying to raise my understanding of Neutrinos/leptons and terminology to do with them. I'm still quite confused and still not entirely sure what in particular about a neutrino is oscillating. Is it the...

Hello, I'm currently in my last year of high school and I'm doing a project about the higgs particle decaying to two photons. I am using HYPATIA to analyse ATLAS events. When a higgs boson decays into two photons, you can see activity in the electromagnetic calorimeter without seeing a track...

Hi people, I have the following question: First, here is a concise statement of the major neutrino speed measurements: http://en.wikipedia.org/wiki/Measurements_of_neutrino_speed As you can see all of them show that the speed of neutrino is within the speed of light, when taken into...

Hi everyone, I am doing a final project on the title " fundamentals of neutrino physics". I wanted to raise some issues with neutrino which makes it the possible way to the physics beyond standard model. I am myself doing some research on these topics but at some points the math bugs me out...

Homework Statement (a) Consider that decay when the pion is at rest. Find the speed β of the muon and the energy E_{v} of the neutrino. (Work in general algebraic terms, and set c=1. Plug in numerical values as late as possible! You may find it useful to define a quantity r=m_{\pi}/m_{\mu}...

I can't seem to find the mass of an anti electron neutrino in MeV. I found that in beta radiation one down quark breaks into an up quark, an electron, and an anti electron neutrino. The mass in MeV of a down quark is 4.8, the mass of an up quark is 2.4 MeV, the mass in MeV of an electron is...

Hi, this is probably pretty simple but it's puzzling me... In neutrino oscillation, you produce and detect neutrinos with a specific flavour (e,μ,τ) but they travel as mass eigenstates (1,2,3). The flavour eigenstates are just linear superpositions of mass eigenstates: nu_e = U_e1 nu_1 +...

Hi everyone. I think for grad school I want to do work on neutrinos. Anyone know of any good and up and coming schools with good faculty working on these experiments? My application should be good, but not great with great grades/research but very average GRE and PGRE scores.

I am reading Mohapatra's book: "Massive Neutrinos in Physics and Astrophysics". At the beginning of chapter 7, it is sought expressions where the right neutrino was considered in the Electroweak Standard Model. Everything was fine until I found the expression...

I am reading Mohapatra's book: "Massive Neutrinos in Physics and Astrophysics". At the beginning of chapter 7, it is sought expressions where the right neutrino was considered in the Electroweak Standard Model. Everything was fine until I found the expression...

Homework Statement I need some help understanding the following problem: A distant, advanced civilization wishes to make contact with us using neutrinos rather than photons as the transmitting medium to avoid problems of obscuration along the line of sight. Suppose they use an \bar{\nu_e}...

Hello, I am opening this thread so as to discuss if possible what you believe is the science case of building a neutrino telescope. Being a fanatic in the field , I would like to hear opinions from whoever wants to say about whether it is important to build such a detector and why. Thank you!

In β+ decay a proton releases a positron and an electron neutrino causing the proton to change into a neutron to help balance the nucleus. I am studying advanced PET imaging and trying find a better understanding of the positrons other half. Does it just go on being a normal electron.

I was reading in my QM book that neutrinos are "essentially left handedly polarized." (Townsend on Page 119) If neutrinos can be polarized, what is oscillating? Do other particles with mass exhibit polarization?

1. Problem "Estimate the flux of neutrinos passing through your body per second if the present energy density of neutrinos from the Big Bang is 0.2 MeV/m3. Assume that you are a standard size covering 0.01 m2". Homework Equations nv = Uv(T) / <Ev> The Attempt at a Solution I've assumed that...

If I reach the speed of light which is 300 00 km/s the time will stop! and if I travel faster then light i'll travel to the past (Please Correct me if I'm wrong) I read that the Neutrino is faster then photon (light) so how can be this possible ?! Because if it is really faster than light that...

EDIT: I apologize for not noticing this earlier, but I realize this should be in the HW/Coursework section of the forum. If possible, would someone be able to move it over for me? Again, sorry for my error and any trouble/confusion. I would like some help calculating the flux of neutrinos...

what are standards model limits on decay of K0, Do, B0 meson into a pair of neutrino and anti neutrino. I know that these highly suppressed due to involve FCNC. but if someone can tell me about theoretical limits on these reactions.

problem regarding determining mass of neutrino (urgent) 1. Homework Statement [/b] It is found that the speed v of the neutrinos with 10 MeV of total energy is (1- v/c) < 2x10^(-9) Estimate the mass of the neutrinos in terms of eV, and determine whether the value you find is an upper or lower...

I'm currently reading a cosmology book, the book is 4 years old. I am looking for more recent articles and developments on the subject. This is in the nature of supportive study material.

Marcus suggested that the nuMSM deserves its own thread and I agree. The nuMSM is the context in which the Shaposhnikov-Wetterich prediction of the Higgs mass was made. (PF thread.) A search on "nuMSM" at InspireHEP turns up 29 papers, a lot of them about cosmology. Shaposhnikov in...

Hi, I am writing my (undergraduate) research thesis on accelerator/particle/neutrino physics. I'm planning on writing about the history of this field (HEP) and what such research has tried to accomplish. Currently, I'm looking for some books to read up on the history and such of HEP...

I've read that the experimental results of Z-Boson resonance confirm the theoretical expectations that there are 3-types of Neutrinos, not 2 or 4. How are these theoretical expectations calculated? I.e. how does the number of neutrino varieties affect Z-boson resonance? Thank you

Hello, In experiments such as KamLAND, it is expected to measure neutrinos emitted by Japan's nuclear reactors. Such experiments were built to find evidence for neutrino oscillation. Is there anyone who knows how one can make the difference between the neutrinos from nuclear reactors and...

I mean, the electron neutrino can transform in a muon neutrino after a while. And that surprised the physics community because the electron can't transform to a muon. But 1) can't the electron transform into a W and a W into a muon? 2) So, Why we say that the neutrino oscillate and the...

Can someone please explain what neutrino mixing angles are and how they relate to neutrino mass.

Hi I've been asked to give "A physical explanation of why the Θ-dependence of multi-GeV Monte Carlo data is qualitatively different from the sub-GeV data." i.e why is the monte carlo simulated data peaked around Cos(theta) = 0 for high energy neutrinos but not low energy ones. I'm not sure...

i would like to ask a few questions about Neutrino oscillation 1) How can i calculate/obtain the mass eigenstates and weak eigenstates of neutrino if we can get those, then how come we cannot obtain the mass eigenvalues. 2) why we know the relation between mass eigenstates and weak...

Has anyone come across any "far out there" ideas for neutrino detection? Just looking for some food for thought.

Two questions. 1. Different flavors have different mass. Look at it from the frame where neutrino is at rest. What’s about energy conservation? Are neutrinos oscillating so quickly that uncertainty principle plays role? 2. Why oscillations of neutral Kaons form 2 new “particles” (K-long and...

Please look at equation 3 and 4 of this paper http://arxiv.org/abs/0707.2481v1 I am facing problem to write the matrix Us Can anybody help me to write the complete matrix?

In long baseline neutrino oscillation experiments, it is possible to investigate the extent of any CP violation by looking at the difference between the rate of neutrino oscillating vs. anti-neutrinos oscillating, ie. we take \Delta P = P(\nu_\alpha \rightarrow \nu_\beta) -...

In Superkamiokande, How does one differentiate between muon being produced by neutrinos coming from upward than the muon being produced by the neutrinos coming from downward. http://hep.bu.edu/~superk/atmnu/

If you produce a lot of neutrinos over a short period of time, and then let them travel a distance long enough that their rest mass makes an appreciable difference in their travel time compared to photons emitted at the same time: Will they arrive: 1) At 3 separate periods of time because...

As far as I know, the anihilation of an electron by a positron is an electromagnetic process described by QED. Neutrinos, however, do not participate in the elektromagnetic interaction. Does that mean a Antineutrino will not anihilate a Neutrino of the same kind? Is there an interaction between...

Superluminal Neutrino Breaks SR and GR...? I have reading a lot of articles and editorials about apparent neutrinos that went faster than the speed of light by 60 nanoseconds, I read some that say yes and no, so I'm a bit confused. So is it true?? Are there neutrinos that went faster than the...

Can anyone think of an empirical reason the neutrino could not possibly have a negative mass; that is any of its states?

In reading through all the info that is coming out from today's big announcement, it seems as they still can't peg the mass of the higgs boson as much of their data comes in the form of decay paths that include neutrinos of unknown mass. My question is whether when they peg the exact mass of...

If I'm not mistaken, measuring the \delta_{CP} from the PMNS matrix may be done by comparing P(\nu_{\alpha} \rightarrow \nu_{\beta}) to P(\overline{\nu_{\alpha}} \rightarrow \overline{\nu_{\beta}}) , where P(\nu_{\alpha} \rightarrow \nu_{\beta}) - P(\overline{\nu_{\beta}} \rightarrow...

What is the neutrino field? How much of what we know about neutrinos is adequately explained by theory? Thanks.

Hello, I'm still new to the world of physics... but I'm learning. I am reading a book that talks about the neutrino, and I understand the three neutrinos associated with the electron, muon, and tao particles. If the purpose of the neutrino is to conserve energy and mass when a particle...

In oscillation experiments that use solar neutrinos, it seems that the mixing angle \theta_{12} and the mass squared difference \Delta m_{12}^2 can be determined from comparing measurements of the neutrino flux to theoretical models of what the Sun should be emitting. However, I am...

I was reading up on chameleon particles today, and this lead me to reading more about neutrino oscillations - I noticed that at one point it said for oscillations to occur, neutrinos must have mass, there was no explanation to this, but it goes against the standard model. Since I am only young...

Homework Statement A supernova can produce a neutron star with typical radius 10km. Assume the neutron star matter consists of iron nuclei (A=56), produced by the electron capture reaction: e^{-}+Co\rightarrowFe+\nu_{e} The matter density is \rho=10^{5} tonne mm^{-3} and the neutrino...