Journal of Physics G: Nuclear and Particle Physics ( IF 3.5 ) Pub Date : 2021-05-20 , DOI: 10.1088/1361-6471/abd83f Subhasmita Mishra 1 , Shivaramakrishna Singirala 2 , Suchismita Sahoo 3
We investigate the phenomenology of singlet scalar dark matter (DM) in a simple U(1) B−L gauge extension of the standard model, made anomaly-free with four exotic fermions. The enriched scalar sector and the new gauge boson Z′, associated with U(1) gauge extension, connect the dark sector to the visible sector. We compute relic density, consistent with Planck limit and a Z′ mediated DM-nucleon cross section, compatible with PandaX bound. The mass of Z′ and the corresponding gauge coupling are constrained from LEP-II and LHC dilepton searches. We also briefly scrutinize the tree-level neutrino mass with a dimension five operator. Furthermore, resonant leptogenesis phenomena is discussed with TeV-scale exotic fermions to produce the observed baryon asymmetry of the Universe. Further, we briefly explain the impact of flavor in leptogenesis and we also project the combined constraints on Yukawa, consistent with oscillation data and observed baryon asymmetry. Additionally, we restrict the new gauge parameters by using the existing data on branching ratios of rare B(τ) decay modes. We see that the constraints from the dark sector are much more stringent from the flavor sector.
中文翻译:
U(1) B - L模型中的标量暗物质、中微子质量和轻质发生
我们在标准模型的简单 U(1) B - L规范扩展中研究单线态标量暗物质 (DM) 的现象学,使用四个奇异费米子使其无异常。丰富的标量扇区和与 U(1) 规范扩展相关的新规范玻色子Z ' 将暗扇区连接到可见扇区。我们计算遗迹密度,与普朗克极限和Z ' 介导的 DM 核子截面一致,与 PandaX 边界兼容。Z的质量 ' 和相应的规范耦合受到 LEP-II 和 LHC 双轻子搜索的约束。我们还使用五维算子简要检查了树级中微子质量。此外,还讨论了与 TeV 尺度的外来费米子共振的轻质发生现象,以产生观察到的宇宙重子不对称性。此外,我们简要解释了风味在瘦身发生中的影响,我们还预测了汤川的综合约束,与振荡数据和观察到的重子不对称性一致。此外,我们通过使用关于稀有B ( τ ) 衰减模式的分支比的现有数据来限制新的规范参数。我们看到,来自黑暗部门的限制比风味部门要严格得多。