LSND异常的关键评价
A critical appraisal of the LSND anomaly
摘要：
所谓的“LSND异常”，即反nu_e事件的3.8 σ过量，被解释为起源于反nu_mu ->反nu_e振荡，引起了许多理论推测。MiniBooNE协作报告了这种解释与他们搜索nu_mu -> nu_e振荡的结果不一致。然而，LSND异常的起源从未得到澄清。一个关键问题是用于LSND实验分析的背景反核通量的预测。对于这一点，决定性的输入来自于在与LSND情况非常相似的条件下用HARP大角度光谱仪测量的π介子光谱：具有800 MeV动能的质子束击中水目标。
英文摘要：
The so-called 'LSND anomaly', a 3.8 sigma excess of anti-nu_e events interpreted as originating from anti-nu_mu -> anti-nu_e oscillation, gave rise to many theoretical speculations. The MiniBooNE Collaboration reported inconsistency of this interpretation with the findings from their search for nu_mu -> nu_e oscillations. Yet the origin of the LSND anomaly was never clarified. A critical issue is the prediction of the background anti-nu_e flux that was used in the analysis of the LSND experiment. For this, decisive input comes from pion spectra measured with the HARP large-angle spectrometer under conditions that closely resemble the LSND situation: a proton beam with 800 MeV kinetic energy hitting a water target.
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