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arXiv 1012.2343hep-ph
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用低能中微子实验测试SO(10)激发的稀薄发生

Testing SO(10)-inspired leptogenesis with low energy neutrino experiments

Pasquale Di Bari, Antonio Riotto

摘要:

我们扩展了我们以前的分析结果表明,当考虑到重口味和轻口味的影响,成功的最小(I型+热)leptogenesis与SO(10)启发的关系是可能的。除非对参数进行微调,否则这些关系会导致RH中微子质谱的分级,从而导致最后的不对称性,这种不对称性主要由次轻的RH中微子衰变产生(N_2主导的leptogenesis)。给出了低能中微子参数的限制条件。在夸克扇区中,允许狄拉克基和带电轻子基之间有一个小的偏差,允许的区域扩大了,再加热温度的下限放宽到~10^10 GeV。证实了在正常有序(NO)中,最轻中微子质量有两个允许的范围:m_1 \simeq(1 - 5)\times 10 ^-3 eV和m_1 \simeq(0.03 - 0.1)eV。对于m_1 \lesssim 0.01 eV,在theta_13-theta_23平面中的允许区域大约以44 + 3(theta_13 - 9)\lesssim theta_23 \lesssim 48 + 0.4(theta_13 - 5)为界,而无中微子双β衰变的有效中微子质量落在m_ee =(1 - 3)10 ^-3 eV(theta_13 =(6 - 11.5))的范围内。对于m_1 \gtrsim 0.01 eV,具有相当尖锐的m_ee \simeq m_1和上限θ_23 \lesssim 46。这些限制将在未来几年内通过低能中微子实验进行测试。我们还发现,倒序(IO),虽然相当强烈的约束,并没有完全排除。特别地,我们发现大约θ_23 \simeq 43 + 12 log(0.2 eV/m_1),这将通过未来的实验进行充分测试。

英文摘要:

We extend the results of a previous analysis of ours showing that, when both heavy and light flavour effects are taken into account, successful minimal (type I + thermal) leptogenesis with SO(10)-inspired relations is possible. Barring fine tuned choices of the parameters, these relations enforce a hierarchical RH neutrino mass spectrum that results into a final asymmetry dominantly produced by the next-to-lightest RH neutrino decays (N_2 dominated leptogenesis). We present the constraints on the whole set of low energy neutrino parameters. Allowing a small misalignment between the Dirac basis and the charged lepton basis as in the quark sector, the allowed regions enlarge and the lower bound on the reheating temperature gets relaxed to values as low as ~ 10^10 GeV. It is confirmed that for normal ordering (NO) there are two allowed ranges of values for the lightest neutrino mass: m_1 \simeq (1-5)\times 10^-3 eV and m_1\simeq (0.03-0.1) eV. For m_1\lesssim 0.01 eV the allowed region in the plane theta_13-theta_23 is approximately bounded by 44 + 3(theta_13-9) \lesssim theta_23 \lesssim 48 + 0.4 (theta_13-5), while the neutrinoless double beta decay effective neutrino mass falls in the range m_ee=(1-3)10^-3 eV for theta_13=(6 -11.5). For m_1 \gtrsim 0.01 eV, one has quite sharply m_ee\simeq m_1 and an upper bound theta_23 \lesssim 46 . These constraints will be tested by low energy neutrino experiments during next years. We also find that inverted ordering (IO), though quite strongly constrained, is not completely ruled out. In particular, we find approximately theta_23 \simeq 43 +12 log(0.2 eV/m_1), that will be fully tested by future experiments.

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