CERN Accelerating science

Article
Report number	hep-ph/0112360 ; CERN-TH-2002-002
Title	Standard Model Baryogenesis through Four-fermion Operators in Braneworlds
Related title	BRANE-WORLDS
Author(s)	Chung, Daniel J.H. (CERN) ; Dent, Thomas (Michigan U.)
Affiliation	(CERN) ; (Michigan Univ.)
Publication	2002
Imprint	30 Dec 2001
Number of pages	38
In:	Phys. Rev. D 66 (2002) 023501/1-18
DOI	10.1103/PhysRevD.66.023501
Subject category	Particle Physics - Phenomenology
Abstract	We study a new baryogenesis scenario in a class of braneworld models with low fundamental scale, which typically have difficulty with baryogenesis. The scenario is characterized by its minimal nature: the field content is that of the Standard Model and all interactions consistent with the gauge symmetry are admitted. Baryon number is violated via a dimension-6 proton decay operator, suppressed today by the mechanism of quark-lepton separation in extra dimensions: we assume that this operator was unsuppressed in the early Universe due to a time-dependent quark-lepton separation. The source of CP violation is the CKM matrix, in combination with the dimension-6 operators. We find that almost independently of cosmology, sufficient baryogenesis is nearly impossible in such a scenario if the fundamental scale is above 100 TeV, as required by an unsuppressed neutron-antineutron oscillation operator. The only exception producing sufficient baryon asymmetry is a scenario involving out-of-equilibrium c quarks interacting with equilibrium b quarks.

Corresponding record in: Inspire
Email contact: djchung@maxwell.uchicago.edu