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arXiv 0806.1449hep-ex
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MiniBooNE的中微子通量预测

The Neutrino Flux prediction at MiniBooNE

MiniBooNE Collaboration

摘要:

助推器中微子实验(MiniBooNE)使用费米国家加速器实验室(FNAL)的助推器同步加速器产生的O(1 GeV)中微子束来搜索numu-to-nue振荡。助推器将具有8 GeV动能(8.89 GeV/c动量)的质子输送到铍靶,从束线中的次级粒子衰变中产生中微子。我们描述了蒙特卡罗模拟的方法来估计中微子的通量从光束线入射到MiniBooNE探测器的两个极性的聚焦喇叭。该模拟使用Geant 4框架来传播粒子,考虑了束线材料中的电磁过程和强子相互作用,以及粒子的衰变。在模拟中,介子和K介子产生的绝对双微分截面已经被调整到与外部测量相匹配,核子和π介子的强子截面也是如此。通过重新加权和重排序技术,通量预报的统计精度得到了提高。通量估计中的系统误差已通过在其不确定性范围内改变参数来确定,并在适当的情况下考虑相关性。

英文摘要:

The Booster Neutrino Experiment (MiniBooNE) searches for numu-to-nue oscillations using the O(1 GeV) neutrino beam produced by the Booster synchrotron at the Fermi National Accelerator Laboratory (FNAL). The Booster delivers protons with 8 GeV kinetic energy (8.89 GeV/c momentum) to a beryllium target, producing neutrinos from the decay of secondary particles in the beam line. We describe the Monte Carlo simulation methods used to estimate the flux of neutrinos from the beamline incident on the MiniBooNE detector for both polarities of the focussing horn. The simulation uses the Geant4 framework for propagating particles, accounting for electromagnetic processes and hadronic interactions in the beamline materials, as well as the decay of particles. The absolute double differential cross sections of pion and kaon production in the simulation have been tuned to match external measurements, as have the hadronic cross sections for nucleons and pions. The statistical precision of the flux predictions is enhanced through reweighting and resampling techniques. Systematic errors in the flux estimation have been determined by varying parameters within their uncertainties, accounting for correlations where appropriate.

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