Post-sphaleron baryogenesis and an upper limit on the neutron-antineutron oscillation time

Author(s)

Babu, K. S. ^[1] ; Dev, P. S. Bhupal ^[2] ; Fortes, Elaine C. F. S. ^[3] ; Mohapatra, R. N. ^{[4, 5]}

Affiliation

^[1] Oklahoma State Univ, Dept Phys, Stillwater, OK 74078 - USA

^[2] Univ Manchester, Consortium Fundamental Phys, Sch Phys & Astron, Manchester M13 9PL, Lancs - England

^[3] Univ Estadual Paulista, Inst Fis Teor, BR-01140070 Sao Paulo - Brazil

^[4] Univ Maryland, Maryland Ctr Fundamental Phys, College Pk, MD 20742 - USA

^[5] Univ Maryland, Dept Phys, College Pk, MD 20742 - USA

• Document type: Journal article
• Source: Physical Review D; v. 87, n. 11 JUN 17 2013.
• Web of Science Citations: 31

Abstract

A recently proposed scenario for baryogenesis, called post-sphaleron baryogenesis (PSB), is discussed within a class of quark-lepton unified framework based on the gauge symmetry SU(2)(L) X SU(2)(R) X SU(4)(c) realized in the multi-TeV scale. The baryon asymmetry of the Universe in this model is produced below the electroweak phase transition temperature after the sphalerons have decoupled from the Hubble expansion. These models embed naturally the seesaw mechanism for neutrino masses and predict color-sextet scalar particles in the TeV range which may be accessible to the LHC experiments. A necessary consequence of this scenario is the baryon-number-violating Delta B = 2 process of neutron-antineutron (n - (n) over bar) oscillations. In this paper we show that the constraints of PSB, when combined with the neutrino oscillation data and restrictions from flavor changing neutral currents mediated by the colored scalars, imply an upper limit on the n - (n) over bar oscillation time of 5 X 10(10) sec regardless of the quark-lepton unification scale. If this scale is relatively low, in the (200-250) TeV range, tau(n-(n) over bar) is predicted to be less than 10(10) sec, which is accessible to the next generation of proposed experiments. (AU)

• FAPESP's process: 11/21945-8 - Flavor physics and new physics
• Grantee: Elaine Cristina Ferreira Silva Fortes
• Support Opportunities: Scholarships in Brazil - Post-Doctoral