arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 0802.3699hep-phastro-phhep-ex
收藏

大气和长基线中微子的振荡和衰变状态

Status of Oscillation plus Decay of Atmospheric and Long-Baseline Neutrinos

M. C. Gonzalez-Garcia, Michele Maltoni

摘要:

我们研究了大气和长基线中微子实验中中微子振荡和不可见衰变的相互作用。我们在这些情景下对Super-Kamiokande的完整大气数据以及长基线K2 K和MINOS进行了全球分析。我们发现,参数为Δ m32^2 = 2.6e-3eV^2和θ 23 ~ 34度的nu_mu -> nu_tau振荡与重中微子nu_3衰变的混合,其寿命为tau_3/m_3 ~ 2.6e-12 s/eV量级,提供了对大气中微子的合理拟合,尽管一旦包括长基线数据,该解决方案变得更加不利(下降到99%CL)。除此之外,没有证据表明中微子衰变宽度不为零,衰变寿命τ_3/m_3 > 9.3e-11 s/eV的下限为99%CL。在Majoron模型的框架下,这一约束可以转化为Majoron与nu_3的耦合束缚和未混合的极轻无菌态,|g_s3| < 8.6e-3(2.2 eV/m_3)。

英文摘要:

We study the interplay of neutrino oscillation and invisible decay in atmospheric and long-baseline neutrinos experiments. We perform a global analysis of the full atmospheric data from Super-Kamiokande together with long-baseline K2K and MINOS in these scenarios. We find that the admixture of nu_mu -> nu_tau oscillations with parameters Delta_m32^2 = 2.6e-3 eV^2 and theta_23 ~ 34 degrees plus decay of the heavy neutrino, nu_3, with lifetime of the order tau_3/m_3 ~ 2.6e-12 s/eV provides a reasonable fit to atmospheric neutrinos, although this solution becomes more disfavored (dropping to the 99% CL) once long-baseline data are included. Other than this local minimum, the analysis shows no evidence in favor of a non-vanishing neutrino decay width and an lower bound on the decay lifetime tau_3/m_3 > 9.3e-11 s/eV is set at 99% CL. In the framework of Majoron models, this constraint can be translated into a bound on the Majoron coupling to nu_3 and an unmixed very light sterile state, |g_s3| < 8.6e-3 (2.2 eV/m_3).

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。

↑