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探索最小超对称标准模型中的CP破坏

Exploring CP violation in the MSSM.

作者信息

Arbey Alexandre, Ellis John, Godbole Rohini M, Mahmoudi Farvah

机构信息

Université de Lyon, Université Lyon 1, Centre de Recherche Astrophysique de Lyon, CNRS, UMR 5574, 69561 Saint-Genis Laval Cedex, France ; Ecole Normale Supérieure de Lyon, Lyon, France ; Theory Division, CERN, 1211 Geneva 23, Switzerland.

Theory Division, CERN, 1211 Geneva 23, Switzerland ; Theoretical Particle Physics and Cosmology Group, Department of Physics, King's College London, London, WC2R 2LS UK.

出版信息

Eur Phys J C Part Fields. 2015;75(2):85. doi: 10.1140/epjc/s10052-015-3294-z. Epub 2015 Feb 21.

DOI:10.1140/epjc/s10052-015-3294-z
PMID:25838795
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4376469/
Abstract

We explore the prospects for observing CP violation in the minimal supersymmetric extension of the Standard Model (MSSM) with six CP-violating parameters, three gaugino mass phases and three phases in trilinear soft supersymmetry-breaking parameters, using the CPsuperH code combined with a geometric approach to maximise CP-violating observables subject to the experimental upper bounds on electric dipole moments. We also implement CP-conserving constraints from Higgs physics, flavour physics and the upper limits on the cosmological dark matter density and spin-independent scattering. We study possible values of observables within the constrained MSSM (CMSSM), the non-universal Higgs model (NUHM), the CPX scenario and a variant of the phenomenological MSSM (pMSSM). We find values of the CP-violating asymmetry [Formula: see text] in [Formula: see text] decay that may be as large as 3 %, so future measurements of [Formula: see text] may provide independent information about CP violation in the MSSM. We find that CP-violating MSSM contributions to the [Formula: see text] meson mass mixing term [Formula: see text] are in general below the present upper limit, which is dominated by theoretical uncertainties. If these could be reduced, [Formula: see text] could also provide an interesting and complementary constraint on the six CP-violating MSSM phases, enabling them all to be determined experimentally, in principle. We also find that CP violation in the [Formula: see text] and [Formula: see text] couplings can be quite large, and so may offer interesting prospects for future [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] colliders.

摘要

我们利用CPsuperH代码并结合一种几何方法，在具有六个CP破坏参数（三个规范玻色子质量相位和三线性软超对称破缺参数中的三个相位）的标准模型最小超对称扩展（MSSM）中，探讨观测CP破坏的前景，以在电偶极矩的实验上限约束下最大化CP破坏可观测量。我们还实施了来自希格斯物理、味物理以及宇宙学暗物质密度和自旋无关散射上限的CP守恒约束。我们研究了约束MSSM（CMSSM）、非通用希格斯模型（NUHM）、CPX情景以及唯象MSSM（pMSSM）变体中可观测量的可能值。我们发现在[公式：见原文]衰变中CP破坏不对称性[公式：见原文]的值可能高达3%，因此未来对[公式：见原文]的测量可能会提供关于MSSM中CP破坏的独立信息。我们发现MSSM中CP破坏对[公式：见原文]介子质量混合项[公式：见原文]的贡献通常低于当前上限，该上限主要由理论不确定性主导。如果这些不确定性能够降低，[公式：见原文]也可能对六个MSSM CP破坏相位提供有趣且互补的约束，原则上能够通过实验确定所有这些相位。我们还发现[公式：见原文]和[公式：见原文]耦合中的CP破坏可能相当大，因此可能为未来的[公式：见原文]、[公式：见原文]、[公式：见原文]和[公式：见原文]对撞机提供有趣的前景。

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