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An extension of the standard model in which parity is spontaneously broken

Tuesday December 12, 2017
2:00 pm

 Presenter:  Kevin Cahill (UNM)
 Series:  Nuclear, Particle, Astroparticle and Cosmology (NUPAC) Seminars
 Abstract:  To be compatible with general relativity, every fundamental theory should be invariant under general coordinate transformations including spatial reflection. This paper describes a simple extension of the standard model in which the action is invariant under spatial reflection, and the vacuum spontaneously breaks parity by giving a mean value to a pseudoscalar field. This field and the scalar Higgs field make the gauge bosons, the known fermions, and a set of mirror fermions suitably massive while avoiding flavor-changing neutral currents. In this model, there is no strong-CP problem; there are no anomalies; fermion number (F = Q + L) is conserved; and heavy mirror fermions form heavy neutral mirror atoms, which are dark-matter candidates. In many grandly unified extensions of the model, nucleons slowly decay into pions, antileptons, and neutrinos in processes that conserve fermion number.
 Host:  Rouzbeh Allahverdi
 Location:  Room 190, Physics & Astronomy

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