CERN Accelerating science

Article
Report number	hep-ph/0306240 ; FTPI-MINN-03-14 ; UMN-TH-2203-04 ; CERN-TH-2003-121 ; CERN-TH-2003-121 ; FTPI-MINN-2003-14 ; UMN-TH-2003
Title	CP Violation in Supersymmetric U(1)' Models
Related title	CHARGE PARITY
Author(s)	Demir, Durmus A. (Minnesota U., Theor. Phys. Inst.) ; Everett, L.L. (CERN)
Affiliation	(CERN)
Publication	2004
Imprint	24 Jun 2003
Number of pages	29
Note	Comments: 29 pp, 3 figs, 2 tables 29 pp, 3 figs, 2 tables
In:	Phys. Rev. D 69 (2004) 015008
DOI	10.1103/PhysRevD.69.015008
Subject category	Particle Physics - Phenomenology
Abstract	The supersymmetric CP problem is studied within superstring-motivated extensions of the MSSM with an additional U(1)' gauge symmetry broken at the TeV scale. This class of models offers an attractive solution to the mu problem of the MSSM, in which U(1)' gauge invariance forbids the bare mu term, but an effective mu parameter is generated by the vacuum expectation value of a Standard Model singlet S which has superpotential coupling of the form SH_uH_d to the electroweak Higgs doublets. The effective mu parameter is thus dynamically determined as a function of the soft supersymmetry breaking parameters, and can be complex if the soft parameters have nontrivial CP-violating phases. We examine the phenomenological constraints on the reparameterization invariant phase combinations within this framework, and find that the supersymmetric CP problem can be greatly alleviated in models in which the phase of the SU(2) gaugino mass parameter is aligned with the soft trilinear scalar mass parameter associated with the SH_uH_d coupling. We also study how the phases filter into the Higgs sector, and find that while the Higgs sector conserves CP at the renormalizable level to all orders of perturbation theory, CP violation can enter at the nonrenormalizable level at one-loop order. In the majority of the parameter space, the lightest Higgs boson remains essentially CP even but the heavier Higgs bosons can exhibit large CP-violating mixings, similar to the CP-violating MSSM with large mu parameter.

Corresponding record in: Inspire
Email contact: [email protected]