Abstract
We present the full one-loop radiative corrections to pair production of neutralinos in e+e− collisions within the Minimal Supersymmetric Standard Model. Particular attention is paid to the definition of weak and QED corrections. The non-universal QED corrections are extracted by subtracting the initial state radiation. We give numerical results for two different SUSY scenarios for e+e−→χ̃01χ̃02 and e+e−→χ̃02χ̃02. The weak and QED corrections are up to several percent or even larger and need to be taken into account at future linear collider experiments.
Highlights
In the Minimal Supersymmetric Standard Model (MSSM) [1], one has two charginos χ±1 and χ±2, which are the fermion mass eigenstates of the supersymmetric partners of the W ± and the charged Higgs states H1±,2
There are four neutralinos χ01-χ04, which are the fermion mass eigenstates of the supersymmetric partners of the photon, the Z0 boson, and the neutral Higgs bosons H10,2. Their mass matrix depends on the parameters M, M′, μ, and tan β, where M and M′ are the SU(2) and U(1) gauge mass parameter, and tan β v2 v1 with v1,2 the vacuum expectation values of the two neutral
In the MSSM the neutralino sector is specified by the gaugino mass parameters M and M′, the higgsino mass parameter μ and the Higgs mixing angle tan β, all appearing in the neutralino mass matrix
Summary
In the Minimal Supersymmetric Standard Model (MSSM) [1], one has two charginos χ±1 and χ±2 , which are the fermion mass eigenstates of the supersymmetric partners of the W ± and the charged Higgs states H1±,2. At a linear e+e− collider, it will be possible to perform measurements with high precision [2, 3] It has been shown in [2] that the masses of charginos and neutralinos can be measured within an accuracy of ∆mχ±,0 = 0.1 − 1 GeV. To decays, the qχ±k , k = 1, 2, full one-loop corrections in [8], and for the decays wAe0re→cafl1cfu ̄2l,atfe2d→forf1qAi 0→inqχ[90i],, i = 1 − 4, where A0 is the pseudoscalar Higgs particle All these calculations have shown that the corrections are important for precise predictions of cross sections, branching ratios and asymmetries. Starting from the tree-level, we outline the calculation of the one-loop corrections in section 3 discussing the renormalization both of the SUSY and SM parameters.
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