English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We consider the neutrino (and antineutrino) flavors arriving at Earth forneutrinos produced in the annihilation of weakly interacting massive particles(WIMPs) in the Sun's core. Solar-matter effects on the flavor propagation ofthe resulting $\agt$ GeV neutrinos are studied analytically within adensity-matrix formalism. Matter effects, including mass-state level-crossings,influence the flavor fluxes considerably. The exposition herein is somewhatpedagogical, in that it starts with adiabatic evolution of single flavors fromthe Sun's center, with $\theta_{13}$ set to zero, and progresses to fullyrealistic processing of the flavor ratios expected in WIMP decay, from theSun's core to the Earth. In the fully realistic calculation, non-adiabaticlevel-crossing is included, as are possible nonzero values for $\theta_{13}$and the CP-violating phase $\delta$. Due to resonance enhancement in matter,nonzero values of $\theta_{13}$ even smaller than a degree can noticeablyaffect flavor propagation. Both normal and inverted neutrino-mass hierarchiesare considered. Our main conclusion is that measuring flavor ratios (inaddition to energy spectra) of $\agt$ GeV solar neutrinos can providediscrinination between WIMP models. In particular, we demonstrate the flavordifferences at Earth for neutrinos from the two main classes of WIMP finalstates, namely $W^+ W^-$ and 95% $b \bar{b}$ + 5% $\tau^+\tau^-$. Conversely,if WIMP properties were to be learned from production in future accelerators,then the flavor ratios of $\agt$ GeV solar neutrinos might be useful forinferring $\theta_{13}$ and the mass hierarchy.

Neutrino flavor ratios as diagnostic of solar WIMP annihilation