CP violating supersymmetric contributions to the electroweak ρ parameter

Sin Kyu Kang; Jung Dae Kim

doi:10.1103/PhysRevD.62.071901

CP violating supersymmetric contributions to the electroweak ρ parameter

Sin Kyu Kang, Jung Dae Kim

School of Natural Sciences

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

The effects of CP violation on the supersymmetric electroweak correction to the ρ parameter are investigated. To avoid the EDM constraints, we require that arg(μ)<10^-2 and the nonuniversal trilinear couplings A_f=(0,0,A₀) and also assume that gluinos are heavier than 400 GeV. The CP phase φ_t=arg(A₀) leads to a large enhancement of the relative mass splittings between t̃₂ and b̃_L(t̃₁), which in turn reduces the one-loop contribution of the top squark and bottom squark to Δρ. For small tan β, such a CP violating effect is prominent. We also study how much the two-loop gluon and gluino contributions are affected by the CP phase. The possible contributions to the ρ parameter arising from the Higgs sector with CP violation are discussed.

Original language	English
Article number	071901
Pages (from-to)	1-5
Number of pages	5
Journal	Physical Review D
Volume	62
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevD.62.071901
State	Published - 1 Oct 2000

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10.1103/PhysRevD.62.071901

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abstract = "The effects of CP violation on the supersymmetric electroweak correction to the ρ parameter are investigated. To avoid the EDM constraints, we require that arg(μ)<10-2 and the nonuniversal trilinear couplings Af=(0,0,A0) and also assume that gluinos are heavier than 400 GeV. The CP phase φt=arg(A0) leads to a large enhancement of the relative mass splittings between {\~t}2 and {\~b}L({\~t}1), which in turn reduces the one-loop contribution of the top squark and bottom squark to Δρ. For small tan β, such a CP violating effect is prominent. We also study how much the two-loop gluon and gluino contributions are affected by the CP phase. The possible contributions to the ρ parameter arising from the Higgs sector with CP violation are discussed.",

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AB - The effects of CP violation on the supersymmetric electroweak correction to the ρ parameter are investigated. To avoid the EDM constraints, we require that arg(μ)<10-2 and the nonuniversal trilinear couplings Af=(0,0,A0) and also assume that gluinos are heavier than 400 GeV. The CP phase φt=arg(A0) leads to a large enhancement of the relative mass splittings between t̃2 and b̃L(t̃1), which in turn reduces the one-loop contribution of the top squark and bottom squark to Δρ. For small tan β, such a CP violating effect is prominent. We also study how much the two-loop gluon and gluino contributions are affected by the CP phase. The possible contributions to the ρ parameter arising from the Higgs sector with CP violation are discussed.

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CP violating supersymmetric contributions to the electroweak ρ parameter

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