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arXiv 1303.6918hep-phhep-ex
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Sphaleron后重子生成和中子-反中子振荡时间上限

Post-Sphaleron Baryogenesis and an Upper Limit on the Neutron-Antineutron Oscillation Time

K. S. Babu, P. S. Bhupal Dev, Elaine C. F. S. Fortes, R. N. Mohapatra

摘要:

本文讨论了最近提出的一种重子生成的方案,称为后球化子重子生成(PSB),它是在多TeV尺度下实现的基于规范对称性SU(2)_LxSU(2)_RxSU(4)_c的夸克-轻子统一框架下进行的.在这个模型中,宇宙的重子不对称性是在电弱相变温度以下,在球对称子与哈勃膨胀退耦之后产生的。这些模型嵌入自然的中微子质量的跷跷板机制,并预测色六重标量粒子在TeV范围内,这可能是访问的LHC实验。这种情况的必然结果是中子-反中子(n- \bar{n})振荡的重子数破坏ΔB=2过程。在本文中,我们表明,PSB的限制,当结合中微子振荡数据和限制从味道改变中性电流介导的有色标量意味着上限的n- \bar{n}振荡时间为5 × 10^{10}秒。不管夸克-轻子统一尺度如何。如果该尺度相对较低,在(200-250)TeV范围内,τ_{n- \bar{n} }被预测为小于10^{10}秒,这对于下一代的实验来说是可行的。

英文摘要:

A recently proposed scenario for baryogenesis, called post--sphaleron baryogenesis (PSB) is discussed within a class of quark--lepton unified framework based on the gauge symmetry SU(2)_L x SU(2)_R x SU(4)_c realized in the multi--TeV scale. The baryon asymmetry of the universe in this model is produced below the electroweak phase transition temperature after the sphalerons have decoupled from the Hubble expansion. These models embed naturally the seesaw mechanism for neutrino masses, and predict color-sextet scalar particles in the TeV range which may be accessible to the LHC experiments. A necessary consequence of this scenario is the baryon number violating ΔB=2 process of neutron--antineutron (n-\bar{n}) oscillations. In this paper we show that the constraints of PSB, when combined with the neutrino oscillation data and restrictions from flavor changing neutral currents mediated by the colored scalars imply an upper limit on the n-\bar{n} oscillation time of 5 x 10^{10} sec. regardless of the quark--lepton unification scale. If this scale is relatively low, in the (200-250) TeV range, τ_{n-\bar{n}} is predicted to be less than 10^{10} sec., which is accessible to the next generation of proposed experiments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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