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The minimal seesaw and leptogenesis models.

Zhi-Zhong Xing1, Zhen-Hua Zhao2

  • 1Institute of High Energy Physics and School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

Reports on Progress in Physics. Physical Society (Great Britain)
|March 19, 2021
PubMed
Summary

The minimal seesaw mechanism, a simplified model for neutrino mass, is nearing experimental verification. This review explores its flavor structures and implications for leptogenesis, CP violation, and the universe's matter-antimatter asymmetry.

Keywords:
CP violationflavor mixingleptogenesisminimal seesawneutrino mass

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Area of Science:

  • Particle Physics
  • Cosmology
  • Astroparticle Physics

Background:

  • The minimal seesaw mechanism offers a simplified approach to explaining neutrino masses.
  • This model is increasingly amenable to direct experimental testing.
  • Leptogenesis provides a potential explanation for the observed matter-antimatter asymmetry in the universe.

Purpose of the Study:

  • To provide an updated review of the minimal seesaw mechanism and its associated leptogenesis.
  • To examine phenomenological aspects, focusing on flavor structures.
  • To compare predictions with current neutrino oscillation and cosmological data.

Main Methods:

  • Review of theoretical frameworks for the minimal seesaw and leptogenesis.
  • Analysis of flavor structures within these models.
  • Confrontation of model predictions with experimental and observational data.

Main Results:

  • The minimal seesaw mechanism, with specific flavor structures, can be constrained by current data.
  • Leptogenesis within this framework offers insights into CP violation and lepton number violation.
  • The interplay between neutrino physics and cosmology is highlighted.

Conclusions:

  • The minimal seesaw mechanism is a viable framework for understanding neutrino properties and early universe cosmology.
  • Further investigation into discrete flavor symmetries and lepton flavor violation is warranted.
  • Experimental and cosmological data are crucial for probing these fundamental physics scenarios.