Q-balls and baryogenesis in the MSSM

Enqvist, Kari and McDonald, John (1998) Q-balls and baryogenesis in the MSSM. Physics Letters B, 425 (3-4). pp. 309-321. ISSN 0370-2693

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We show that Q-balls naturally exist in the Minimal Supersymmetric Standard Model (MSSM) with soft SUSY breaking terms of the minimal N = 1 SUGRA type. These are associated with the F-and D-flat directions of the scalar potential once radiative corrections are taken into account. We consider two distinct cases, corresponding to the "HuL" (slepton) direction with L-balls and the "u(c)d(c)d(c)" and "u(c)u(c)d(c)e(c)" (squark) directions with B-balls. The L-ball always has a small charge, typically of the order of 1000, whilst the B-ball can have an arbitrarily large charge, which, when created cosmologically by the collapse of an unstable Affleck-Dine condensate, is likely to be greater than 10(14). The B-balls typically decay at temperatures less than that of the electroweak phase transition, leading to a novel version of Affleck-Dine baryogenesis, in which the B asymmetry comes from Q-ball decay rather than condensate decay. This mechanism can work even in the presence of additional L violating interactions or B-L conservation, which would rule out conventional Affleck-Dine baryogenesis.

Item Type: Journal Article
Journal or Publication Title: Physics Letters B
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100/3106
Departments: Faculty of Science and Technology > Physics
ID Code: 83231
Deposited By: ep_importer_pure
Deposited On: 29 Nov 2016 09:56
Refereed?: Yes
Published?: Published
Last Modified: 11 Feb 2020 09:10
URI: https://eprints.lancs.ac.uk/id/eprint/83231

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