The GeV-scale dark matter with B–L asymmetry
The GeV-scale dark matter with B–L asymmetry
复制标题
DOI：
10.1016/j.physletb.2012.01.032
复制
发表时间：
2011-10
影响因子：
4.4
通讯作者：
M. Ibe;S. Matsumoto;T. Yanagida
中科院分区：
文献类型：
--
作者：
M. Ibe;S. Matsumoto;T. Yanagida
暗物质的一个重要性质是它的稳定性。U（1）B-L规范对称性是保证稳定性的最有吸引力的对称性。虽然U（1）B-L的对称性在很高的能量尺度下会被打破，从而通过跷跷板机制解释了微小的中微子质量，但U（1）B-L的剩余离散对称性可以自然地稳定暗物质。我们证明了，当在电弱和U（1）B-L破缺之间的尺度上，有一个新的物理把暗物质的B-L电荷和标准模型粒子联系起来时，暗物质的质量肯定是（5-7）/QDMGeV（QDM是暗物质的B-L电荷），这不仅与新物理的细节无关，而且与它的能量尺度无关.我们还展示了两个有吸引力的例子。第一个是B-L电荷为1/3或2/3的标量暗物质，这与目前的CoGeNT结果非常一致。另一个是具有三分之一B-L电荷的费米暗物质，从模型构建的角度来看，这也是有吸引力的。
One of important properties of dark matter is its stability. The U(1)B–Lgauge symmetry is the most attractive symmetry to guarantee the stability. Though the symmetry is expected to be broken at very high energy scale to account for tiny neutrino masses through the seesaw mechanism, the residual discrete symmetry of U(1)B–Lcan stabilize the dark matter naturally. We prove that, when there is new physics connecting B–L charges of dark matter and standard model particles at the scale between the electroweak and the U(1)B–Lbreaking, the mass of dark matter is definitely predicted to be (5–7)/QDMGeV (QDMis the B–L charge of dark matter) independent not only of details of the new physics but also of its energy scale. We also show two attractive examples. First one is the scalar dark matter with the B–L charge of one or two third, which turns out to be very consistent with current CoGeNT results. Another one is the fermionic dark matter having the B–L charge of one third, which is also attractive from the viewpoint of model building.