Neutrino masses from the top down

Paul Langacker

Research output: Contribution to journalReview articlepeer-review

13 Scopus citations


General classes of mechanisms for generating small neutrino masses are surveyed from a top-down (superstring) perspective. In particular, string constructions have motivated various possibilities involving higher-dimensional operators, string instantons, and wave-function overlaps in large or warped extra dimensions. These constructions may yield small Dirac masses, Majorana masses via the Weinberg operator, or Majorana masses from a seesaw mechanism, although the last typically differ in detail from the more conventional Grand Unified Theory models. Possibilities for mixing between light, active neutrinos and sterile neutrinos are surveyed.

Original languageEnglish (US)
Pages (from-to)215-235
Number of pages21
JournalAnnual Review of Nuclear and Particle Science
StatePublished - 2012

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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