Babu K S, Mohapatra R N, Nasri Salah
Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078, USA.
Phys Rev Lett. 2007 Apr 20;98(16):161301. doi: 10.1103/PhysRevLett.98.161301. Epub 2007 Apr 16.
We present a simple extension of the minimal supersymmetric standard model which provides a unified picture of cosmological baryon asymmetry and dark matter. Our model introduces a gauge singlet field N and a color triplet field X which couple to the right-handed quark fields. The out-of-equilibrium decay of the Majorana fermion N mediated by the exchange of the scalar field X generates adequate baryon asymmetry for MN approximately 100 GeV and MX approximately TeV. The scalar partner of N (denoted N1) is naturally the lightest SUSY particle as it has no gauge interactions and plays the role of dark matter. The model is experimentally testable in (i) neutron-antineutron oscillations with a transition time estimated to be around 10(10)sec, (ii) discovery of colored particles X at LHC with mass of order TeV, and (iii) direct dark matter detection with a predicted cross section in the observable range.
我们提出了最小超对称标准模型的一个简单扩展，它为宇宙重子不对称性和暗物质提供了一个统一的图景。我们的模型引入了一个规范单态场N和一个与右手夸克场耦合的色三重态场X。由标量场X的交换介导的马约拉纳费米子N的非平衡衰变，对于质量约为100 GeV的MN和质量约为TeV的MX产生了足够的重子不对称性。N的标量伙伴（记为N1）自然是最轻的超对称粒子，因为它没有规范相互作用，并扮演暗物质的角色。该模型在以下方面是可通过实验检验的：（i）中子 - 反中子振荡，其转变时间估计约为10(10)秒；（ii）在大型强子对撞机（LHC）上发现质量约为TeV量级的带色粒子X；（iii）直接暗物质探测，其预测的截面在可观测范围内。
