Neutron-antineutron oscillations as a probe of baryogenesis

31 Aug 2021, 17:10
Talk in parallel session Cosmology and particle physics Discussion Panel Cosmology 2


Chandan Hati (Technische Universität München)


An observation of Neutron-antineutron ($n-\bar{n}$) oscillations, would directly imply physics beyond the Standard Model violating baryon number by two units $|\Delta B| = 2$ and hence might provide a close link to the mechanism behind the observed baryon asymmetry of the Universe. In this talk, I will discuss the consequences of such a discovery in the near future, e.g. at the Deep Underground Neutrino Experiment or the European Spallation Source, for baryogenesis mechanisms. I will discuss both an effective field theory approach and a more concrete simplified model approach with a source of CP violation and different hierarchies between the scales of new physics. I will also highlight the complementarity of $n-\bar{n}$~oscillation searches with other experimental constraints from dinucleon decay, LHC, and meson oscillations and discuss how an observation of $n-\bar{n}$~oscillation can rule out many potential baryogenesis scenarios and favour only a select few providing an exciting possibility to understand our matter dominated Universe at laboratory.

Reference to paper (DOI or arXiv) 2105.06487

Primary authors

Chandan Hati (Technische Universität München) Julia Harz (Technical University of Municht (TUM)) Kåre Fridell (Technical University of Munich)

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