SBND Cross-Section Analysis

对中微子相互作用物理学的几个方面的理解仍然是由70年代和80年代气泡室时代记录的几百个事件的小样本驱动的。这些数据集仍然是独一无二的，因为它们提供了一个非常详细的中微子事件特征。新的液态氩（LAr）时间投影室（TPC）实验，现在即将上线，中微子事件成像能力与气泡室实验相当，但统计数据要高得多。这些采用LArTPC探测器的新实验数据可以为中微子研究带来一代人的进步。到本十年结束时，一些对中微子相互作用特性的最精确测量将来自SBND实验（一个112吨基准质量的LArTPC实验，距离助推器中微子束靶110米）。SBND实验将于2018年开始收集数据。SBND将在短短一年的时间内收集超过100万个事件的样本。准弹性散射（QE）将是SBND的主要相互作用机制。QE在所有几个GeV的能量区域仍然非常相关，它在中微子振荡研究中至关重要。在单个核子上，这个过程在理论上是可以理解的，并且受到来自电子散射、中子B衰变和氢和氘的中微子实验的实验信息的相对较好的约束。然而，十多年来，我们一直无法用基于单个核子相互作用的模型来描述核QE数据，揭示了两个核子相互作用的重要性。后者已进一步强调从头计算的核响应函数。尽管最近的进展，一个全面的描述双核子电流和集体效应仍然缺失。该项目将涉及使用SBND数据对带电电流类QE散射进行独立于模型的通量积分微分截面测量。使用SBND类QE测量，以及其他实验的测量和GENIE中微子蒙特卡罗模拟中最近的理论工作，将围绕QE峰值进行理论模型的全面表征。实验测量和模型表征将使一个新的全球性的调整的GENIE模拟的发展作出重大贡献，旨在提高中微子相互作用建模在氩的早期DUNE物理开发计划。该项目也将在SBND中发挥重要作用

The understanding of several aspects of neutrino interaction physics is still driven by small samples of just a few hundred events recorded in the bubble chamber era in the 70's and 80's. These data sets are still unique as they afforded a very detailed look at neutrino event characteristics. The new liquid-Argon (LAr) Time Projection Chamber (TPC) experiments, that are now coming online, have neutrino event imaging capabilities comparable to that of bubble chamber experiments but much higher statistics. Data from these new experiments employing LArTPC detectors can bring a generational advance in neutrino studies. By the end of this decade, some of most precise measurements of neutrino interaction characteristics will come from the SBND experiment experiment (a 112-tonne fiducial mass LArTPC experiment, 110 m from the Booster neutrino beam target). The SBND experiment will start taking data in 2018. A sample of more than 1M events would be collected by SBND in just one year of running. Quasielastic scattering (QE) will be the dominant interaction mechanism in SBND. QE remains very relevant through all the few-GeV energy region and it is critically important in neutrino oscillation studies. On single nucleons, this process is theoretically understood and relatively well constrained by experimental information from electron scattering, neutron B decay and neutrino experiments on Hydrogen and Deuterium. However, for more than a decade, we had been unable to describe nuclear QE-like data with models based on interactions on single nucleons alone, revealing the importance of two-nucleon interactions. The latter has been further stressed by ab-initio calculations of nuclear response functions. Despite the recent progress, a comprehensive description of two-nucleon currents and collective effects is still missing. The project will involve the pursuit of model-independent flux-integrated differential cross-section measurements of charged-current QE-like scattering using SBND data. Using the SBND QE-like measurements, as well as measurements from other experiments and recent theoretical work implemented within the GENIE neutrino Monte Carlo simulation, a comprehensive characterisation of theoretical models will be performed around the QE peak. The experimental measurements and model characterisation will enable a substantial contribution to the development of a new global tune of the GENIE simulation aiming specifically to improve neutrino interaction modeling in Argon for the early DUNE physics exploitation programme. This project will also play an important role in the SBND