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arXiv 1102.5352hep-phhep-ex
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长程轻子味相互作用与中微子振荡

Long-Range Lepton Flavor Interactions and Neutrino Oscillations

Hooman Davoudiasl, Hye-Sung Lee, William J. Marciano

备注：
Version to appear in PRD
发表信息：
Phys.Rev.D84:013009,2011
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摘要：

MINOS加速器中微子实验的最新结果表明，nu_mu和反nu_mu消失振荡参数之间可能存在差异，这可能归因于作用于中微子的新的长距离势。作为一个具体的例子，我们考虑一个具有规范B-L_e - 2 L_tau数的模型，该模型包含一个极轻的新矢量玻色子m_Z' < 10^-18 eV，极弱的耦合α' < 10^-52。在这种情况下，nu_mu到nu_tau和反nu_mu到反nu_tau振荡之间的差异可能是由于地球和太阳中的中子产生的长程势造成的，该长程势将地球上的nu_mu和nu_tau区分开来，电势差约为6*10^-14 eV，并改变反中微子的符号。我们表明，现有的太阳能，反应堆，加速器，和大气中微子振荡的限制，可以在很大程度上容纳的参数值，有助于解释可能的MINOS异常，这种新的物理，虽然有一些紧张气氛的限制。与当前界限一致的远程相互作用可能会对20-50 GeV范围内的大气中微子消失产生非常显着的影响，这将使用目前正在运行的IceCube DeepCore阵列进行研究，并且可能会对未来的高精度产生显着影响。分别在nu_mu和anti-nu_mu消失中实现+- 1%灵敏度的长基线振荡实验。总之，这些实验可以将新的远距离效应的范围扩大到远远超出目前的范围，并测试它们与上述MINOS异常的相关性。我们还指出，由于地日距离的变化，来自太阳的长程势可能导致中微子数据在百分比水平上的年度调制。类似的现象也适用于其他潜在的新的规范对称性，如L - 3 L_tau和B - 3 L_tau。

英文摘要：

Recent results from the MINOS accelerator neutrino experiment suggest a possible difference between nu_mu and anti-nu_mu disappearance oscillation parameters, which one may ascribe to a new long-distance potential acting on neutrinos. As a specific example, we consider a model with gauged B - L_e - 2 L_tau number that contains an extremely light new vector boson m_Z' < 10^-18 eV and extraordinarily weak coupling alpha' < 10^-52. In that case, differences between nu_mu to nu_tau and anti-nu_mu to anti-nu_tau oscillations can result from a long-range potential due to neutrons in the Earth and the Sun that distinguishes nu_mu and nu_tau on Earth, with a potential difference of ~ 6*10^-14 eV, and changes sign for anti-neutrinos. We show that existing solar, reactor, accelerator, and atmospheric neutrino oscillation constraints can be largely accommodated for values of parameters that help explain the possible MINOS anomaly by this new physics, although there is some tension with atmospheric constraints. A long-range interaction, consistent with current bounds, could have very pronounced effects on atmospheric neutrino disappearance in the 20-50 GeV range that will be studied with the IceCube DeepCore array, currently in operation, and can have a significant effect on future high-precision long-baseline oscillation experiments that aim for +- 1% sensitivity, in nu_mu and anti-nu_mu disappearance, separately. Together, these experiments can extend the reach for new long-distance effects well beyond current bounds and test their relevance to the aforementioned MINOS anomaly. We also point out that long-range potentials originating from the Sun could lead to annual modulations of neutrino data at the percent level, due to the variation of the Earth-Sun distance. A similar phenomenology is shown to apply to other potential new gauge symmetries such as L - 3 L_tau and B - 3 L_tau.

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