SBND Cross-Section Analysis

对中微子相互作用物理的几个方面的理解仍然是由70‘S和80’S泡沫室时代记录的几百个事件的小样本推动的。这些数据集仍然是独一无二的，因为它们提供了对中微子事件特征的非常详细的观察。即将上线的新的液氩(LAR)时间投影室(TPC)实验具有与气泡室实验相当的中微子事件成像能力，但统计数据要高得多。使用LArTPC探测器的这些新实验的数据可以为中微子研究带来一代人的进步。到本十年末，对中微子相互作用特性的一些最精确的测量将来自SBND实验(一个112吨基准质量的LArTPC实验，距离助推器中微子束目标110米)。SBND实验将于2018年开始采集数据。SBND将在短短一年的时间里收集到100多万个活动的样本。准弹性散射(QE)将是SBND中主要的相互作用机制。在所有的低GeV能区，QE仍然是非常重要的，它在中微子振荡研究中是至关重要的。在单核子上，这一过程在理论上得到了理解，并受到来自电子散射、中子B衰变和中微子对氢和氢的中微子实验的实验信息的较好约束。然而，十多年来，我们一直无法用仅基于单核子相互作用的模型来描述核QE类数据，这揭示了双核子相互作用的重要性。核反应函数的从头计算进一步强调了后者。尽管最近取得了进展，但对双核子电流和集体效应的全面描述仍然缺乏。该项目将涉及利用SBND数据对带电电流QE类散射进行与模型无关的通量积分微分截面测量。利用SBND类QE测量，以及来自其他实验的测量和最近在Genie中微子蒙特卡罗模拟中实施的理论工作，将围绕QE峰对理论模型进行全面的表征。实验测量和模型表征将为开发新的全球精灵模拟做出实质性贡献，旨在为早期沙丘物理开发计划改进Argon中的中微子相互作用模型。该项目还将在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