Supernova Neutrinos - Department of Theoretical Physics
Supernova Neutrinos - Department of Theoretical Physics
Supernova Neutrinos - Department of Theoretical Physics
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MIKHEYEV-SMIRNOV-WOLFENSTEIN (MSW) EFFECT<br />
[Wolfenstein, PRD 17, 2369 (1978)]<br />
When neutrinos propagate in a medium they will experience a shift <strong>of</strong> their<br />
energy, similar to photon refraction, due to their coherent interaction with the<br />
medium constituents<br />
n e e ±<br />
n<br />
n e,,<br />
e,,<br />
W ± Z 0<br />
e ± n e<br />
Charged current<br />
f<br />
Neutral current<br />
The difference <strong>of</strong> the interaction energy <strong>of</strong> different flavors gives an<br />
effective potential for electron (anti)neutrinos<br />
f<br />
V( x) = 2G F<br />
N e<br />
net electron density
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