在IceCube中寻找大气中微子的洛伦兹破坏恒星信号
Search for a Lorentz-violating sidereal signal with atmospheric neutrinos in IceCube
摘要:
对冰立方中大气μ介子中微子通量的恒星调制进行了研究。这样的信号可能是洛伦兹违反物理学的指示。从标准模型的扩展推导出的中微子振荡模型,允许依赖于中微子传播方向的中微子振荡。用离散傅里叶变换方法对其中一个模型中的Lorentz和CPT破坏系数进行了约束。由于冰立方独特的高能量范围,相对于其他实验设定的限制,可以将某些违反洛伦兹振荡的限制提高三个数量级。
英文摘要:
A search for sidereal modulation in the flux of atmospheric muon neutrinos in IceCube was performed. Such a signal could be an indication of Lorentz-violating physics. Neutrino oscillation models, derivable from extensions to the Standard Model, allow for neutrino oscillations that depend on the neutrino's direction of propagation. No such direction-dependent variation was found. A discrete Fourier transform method was used to constrain the Lorentz and CPT-violating coefficients in one of these models. Due to the unique high energy reach of IceCube, it was possible to improve constraints on certain Lorentz-violating oscillations by three orders of magnitude with respect to limits set by other experiments.
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