利用双探测器拟合在 MINOS 和 MINOS+中寻找无质量中微子。
Search for Sterile Neutrinos in MINOS and MINOS+ Using a Two-Detector Fit.
机构信息
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.
Argonne National Laboratory, Argonne, Illinois 60439, USA.
出版信息
Phys Rev Lett. 2019 Mar 8;122(9):091803. doi: 10.1103/PhysRevLett.122.091803.
A search for mixing between active neutrinos and light sterile neutrinos has been performed by looking for muon neutrino disappearance in two detectors at baselines of 1.04 and 735 km, using a combined MINOS and MINOS+ exposure of 16.36×10^{20} protons on target. A simultaneous fit to the charged-current muon neutrino and neutral-current neutrino energy spectra in the two detectors yields no evidence for sterile neutrino mixing using a 3+1 model. The most stringent limit to date is set on the mixing parameter sin^{2}θ_{24} for most values of the sterile neutrino mass splitting Δm_{41}^{2}>10^{-4} eV^{2}.
通过在基线为 1.04 和 735km 的两个探测器中寻找μ中微子消失，利用 MINOS 和 MINOS+ 对 16.36×10^{20}个靶质子的联合实验，对活性中微子和轻质量惰性中微子的混合进行了搜索。对两个探测器中带电中微子μ中微子和中性中微子能谱的同时拟合，使用 3+1 模型，没有发现惰性中微子混合的证据。对于大多数质量分裂Δm_{41}^{2}>10^{-4} eV^{2}的惰性中微子，对混合参数 sin^{2}θ_{24}设定了迄今为止最严格的限制。
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