The iron calorimeter (ICAL) at India-based neutrino observatory (INO) is designed to mainly observe the muons produced in the charged current interactions of atmospheric muon neutrinos and antineutrinos. The track of the muon is reconstructed using the hits they produce in the detector. From this track, the charge, the energy and the direction of the muon are estimated, which are used to do oscillation physics analysis. In a large fraction of events, a number of hadrons are also produced in addition to the muons. The charged hadrons also leave hits in the detector which can be utilised to estimate the hadron energy. In this work, we generate atmospheric neutrino events using two different neutrino event generators: NUANCE and GENIE. The generated events are passed through the Geant4 simulator of ICAL. In each case, we study the relation between hadron hits, defined to be the difference between the total number of hits and the muon track hits, and the hadron energy. We find that a non-negligible number of baryons are produced in atmospheric neutrino interactions. For $${E}_\mathrm{had} < 5$$ E had < 5 GeV, almost all the hadron energy is carried by these baryons. Finally, we formulate a procedure by which the hadron energy can be estimated from the number of hadron hits.

中文翻译：

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从大气中微子事件估计强子能量

位于印度的中微子天文台 (INO) 的铁量热仪 (ICAL) 旨在主要观测大气中微子中微子和反中微子在带电电流相互作用中产生的 μ 子。μ子的轨迹是使用它们在探测器中产生的命中来重建的。从这条轨迹上估计出μ子的电荷、能量和方向，用来做振荡物理分析。在大部分事件中，除了 μ 子之外，还会产生许多强子。带电强子还会在探测器中留下撞击，可用于估计强子能量。在这项工作中，我们使用两种不同的中微子事件发生器生成大气中微子事件：NUANCE 和 GENIE。生成的事件通过 ICAL 的 Geant4 模拟器传递。在每种情况下，我们研究了强子命中数与强子能量之间的关系，强子命中数定义为命中总数和介子轨道命中数之间的差异。我们发现在大气中微子相互作用中产生了不可忽视的重子数量。对于 $${E}_\mathrm{had} < 5$$ E has < 5 GeV，几乎所有的强子能量都由这些重子携带。最后，我们制定了一个程序，通过该程序可以从强子命中数估计强子能量。