SuperK大气中微子实验中轻子事件的理论研究
Theoretical study of lepton events in the atmospheric neutrino experiments at SuperK
摘要：
Super-Kamiokande报告了大气中微子实验中轻子事件的结果。这些结果已提交了一个22.5kT的水基准质量的曝光1489天，事件分为亚GeV，多GeV和PC事件。本文研究了亚GeV能区大气中微子事件中准弹性散射、非相干和相干π介子产生过程的核介质效应，因为它们对该能区的轻子事件贡献最大。我们采用Honda等人给出的大气中微子通量，在局域密度近似下进行了计算。在准弹性反应的情况下，我们考虑了泡利阻塞效应、费米运动、库仑效应、核介质中弱跃迁强度的重整化。通过考虑核介质中$Δ$性质的重正化和出射π介子与剩余核的末态相互作用效应，在$Δ$ -支配模型中计算了导致轻子和π介子产生的非弹性反应.我们提出的轻子事件在我们的模型中得到的结果，有和没有核介质的影响，并将它们与Monte Carlo预测中使用的模拟和实验观察到的事件报告的超级神冈合作。
英文摘要：
Super-Kamiokande has reported the results for the lepton events in the atmospheric neutrino experiment. These results have been presented for a 22.5kT water fiducial mass on an exposure of 1489 days, and the events are divided into sub-GeV, multi-GeV and PC events. We present a study of nuclear medium effects in the sub-GeV energy region of atmospheric neutrino events for the quasielastic scattering, incoherent and coherent pion production processes, as they give the most dominant contribution to the lepton events in this energy region. We have used the atmospheric neutrino flux given by Honda et al. These calculations have been done in the local density approximation. We take into account the effect of Pauli blocking, Fermi motion, Coulomb effect, renormalization of weak transition strengths in the nuclear medium in the case of the quasielastic reactions. The inelastic reactions leading to production of leptons along with pions is calculated in a $Δ$- dominance model by taking into account the renormalization of $Δ$ properties in the nuclear medium and the final state interaction effects of the outgoing pions with the residual nucleus. We present the results for the lepton events obtained in our model with and without nuclear medium effects, and compare them with the Monte Carlo predictions used in the simulation and the experimentally observed events reported by the Super-Kamiokande collaboration.
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