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arXiv 0711.2121hep-ph
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低能超对称模型中的辐射中子产生

Radiative Neutralino Production in Low Energy Supersymmetric Models

Rahul Basu, P. N. Pandita, Chandradew Sharma

摘要:

在国际直线对撞机低能超对称模型下,研究了辐射过程$e^+e^- \to \tildeχ^0_1 \tildeχ^0_1γ$中最轻中性伴子的产生。这包括最小超对称标准模型以及它的扩展与额外的手征希格斯单线态超场,非最小超对称标准模型。我们比较和对比的信号截面的最小和非最小超对称标准模型的中性伴子部门的参数的依赖。我们还考虑了这个过程的背景来自标准模型过程$e^+e^- \to ν\barνγ$,以及来自中微子(sneutrinos)的标量伙伴(sneutrinos)$e^+e^- \to \tildeν\tildeν^\ast γ$的辐射产生,当sneutrinos不可见地衰变时,它可以是辐射中性伴子产生的背景。在低能超对称模型中,最轻的中性伴子的辐射产生可能是在线性对撞机的第一级研究标准模型粒子的超对称伙伴的唯一渠道,因为较重的中性伴子、电荷伴子和slepton可能太重而不能在带有$\sqrt{s} =500\GeV$的$e^+ e^-$机器上成对产生。

英文摘要:

We study the production of the lightest neutralinos in the radiative process $e^+e^- \to \tildeχ^0_1 \tildeχ^0_1γ$ in low energy supersymmetric models for the International Linear Collider energies. This includes the minimal supersymmetric standard model as well as its extension with an additional chiral Higgs singlet superfield, the nonminimal supersymmetric standard model. We compare and contrast the dependence of the signal cross section on the parameters of the neutralino sector of the minimal and nonminimal supersymmetric standard model. We also consider the background to this process coming from the Standard Model process $e^+e^- \to ν\barνγ$, as well as from the radiative production of the scalar partners of the neutrinos (sneutrinos) $e^+e^- \to \tildeν\tildeν^\ast γ$, which can be a background to the radiative neutralino production when the sneutrinos decay invisibly. In low energy supersymmetric models radiative production of the lightest neutralinos may be the only channel to study supersymmetric partners of the Standard Model particles at the first stage of a linear collider, since heavier neutralinos, charginos and sleptons may be too heavy to be pair-produced at a $e^+ e^-$ machine with $\sqrt{s} =500\GeV$.

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