arXiv 1909.020442019-09hep-phhep-ex

重子不对称性的Higgs三驾马车

Higgs Troika for Baryon Asymmetry

Hooman Davoudiasl, Ian M. Lewis, Matthew Sullivan

备注：: 11 pages, 2 figures. Extended discussion of reheating mechanism, minor revisions
发表信息：: Phys. Rev. D 101, 055010 (2020)
DOI：: 10.1103/PhysRevD.101.055010

摘要：

为了解释宇宙的重子不对称性，我们扩展了标准模型（SM），增加了两个具有小真空期望值的希格斯双重态。额外的希格斯场通过复杂的汤川耦合与SM费米子相互作用，导致新的CP破坏源。我们提出了一个简单的味模型与$\mathcal{O}(1)$或更少的汤川耦合夸克和带电轻子，符合目前的味约束。为了产生中微子质量和重子不对称性，$\sim 0.1-10$ TeV范围内的右手中微子与“希格斯三驾马车”耦合。“新的希格斯二重态质量可能接近TeV尺度，允许不对称衰变为标准模型轻子二重态和右手中微子。轻子双重态的不对称性随后被处理成重子不对称性，类似于轻子生成。由于新场的质量接近TeV尺度，因此可能存在丰富的高能对撞机现象，包括125 GeV希格斯衰变为μ子和τ子的可观察偏差，以及可检测的低能量信号，如电子EDM或$μ\rightarrow eγ$。因此，这在原则上是一个可检验的重子不对称性产生模型，在这方面类似于“电弱重子生成”。"

英文摘要：

To explain the baryon asymmetry of the Universe, we extend the Standard Model (SM) with two additional Higgs doublets with small vacuum expectation values. The additional Higgs fields interact with SM fermions through complex Yukawa couplings, leading to new sources of CP violation. We propose a simple flavor model with $\mathcal{O}(1)$ or less Yukawa couplings for quarks and charged leptons, consistent with current flavor constraints. To generate neutrino masses and the baryon asymmetry, right-handed neutrinos in the $\sim 0.1-10$ TeV range couple to the "Higgs Troika." The new Higgs doublet masses could be near the TeV scale, allowing for asymmetric decays into Standard Model lepton doublets and right-handed neutrinos. The asymmetry in lepton doublets is then processed into a baryon asymmetry, similar to leptogenesis. Since the masses of the new fields are near the TeV scale, there is potentially a rich high energy collider phenomenology, including observable deviations in the 125 GeV Higgs decay into muons and taus, as well as detectable low energy signals such as the electron EDM or $μ\rightarrow eγ$. Hence, this is in principle a testable model for generation of baryon asymmetry, similar in that respect to "electroweak baryogenesis."

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