Talk:Mikheyev-Smirnov-Wolfenstein effect

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[edit] Our expectations for the MSW effect

I would like to raise a concern about the line: "For high energy solar neutrinos the MSW effect is important, and leads us to expect that Pee=sin2θ ≈ 30%". The Standard Model (augmented to accomodate neutrino mass and oscillation) has no expectation for this value. On the contrary, the mixing angle in question ("theta" here, "theta_12" in the neutrino oscillation article) is a completely arbitrary quantity in the SM. In fact, it is the observation of an MSW effect modulated survival probability of close to 35% which has allowed the determination of this angle to be somewhere close to sin^{-1} 1/sqrt(3). So, I propose to modify this sentence, unless others disagree strongly (in which case, we should discuss some more). Paulfharrison 07:44, 29 May 2007 (UTC)

[edit] ν2 eigenstate

The term needs explaining. --Michael C. Price talk 19:29, 24 August 2006 (UTC)

I tried to clarify it. The page is still kind of confusing, though. HEL 21:11, 15 October 2006 (UTC)

[edit] Neutrino Interaction with Matter

I have read that "Neutrinos pass thru 30 light years of matter without interaction". As a matter of fact, I've read it in an introductury brochure of astrophysics.

How come, if neutrinos pass thru matter like nothing, there can be a "MSW resonace effect" within the sun? That's less than 1 million kilometers of matter in the sun! Phr en (talk) 08:05, 28 May 2008 (UTC)