论文标题
通过90厘米长的目标,通过光束衰减对生产横截面的测量31 GEV/$ c $质子在碳上的测量
Measurement of the production cross section of 31 GeV/$c$ protons on carbon via beam attenuation in a 90-cm-long target
论文作者
论文摘要
碳上30.92 GEV/$ c $质子的生产横截面是由cern SPS在Cern SPS处的Na61/Shine光谱仪通过横梁衰减在T2K中质振荡实验的90厘米长的副本(副本)中测量的。直接生产横截面估计的使用方法最大程度地减少了弹性和准弹性相互作用的模型校正。获得的生产横截面为$σ_\ MATHRM {prod}〜= 〜227.6〜 \ pm 〜0.8 \ Mathrm {(stat)} 〜_ { - 〜3.2}^{+〜1.9}^{+〜1.9} \ Mathrm {(sys)}它与以前的Na61/Shine结果一致,该碳目标获得了,同时提供了改进的精度,总体不确定性小于2 $ \%$。进行此直接测量是为了减少与重新加权中微子饲养的载体相关率有关的T2K中微子通量预测的不确定性。
The production cross section of 30.92 GeV/$c$ protons on carbon is measured by the NA61/SHINE spectrometer at the CERN SPS by means of beam attenuation in a copy (replica) of the 90-cm-long target of the T2K neutrino oscillation experiment. The employed method for direct production cross-section estimation minimizes model corrections for elastic and quasi-elastic interactions. The obtained production cross section is $σ_\mathrm{prod}~=~227.6~\pm~0.8\mathrm{(stat)}~_{-~3.2}^{+~1.9}\mathrm{(sys)}~{-~0.8}\mathrm{(mod)}$ mb. It is in agreement with previous NA61/SHINE results obtained with a thin carbon target, while providing improved precision with a total fractional uncertainty of less than 2$\%$. This direct measurement is performed to reduce the uncertainty on the T2K neutrino flux prediction associated with the re-weighting of the interaction rate of neutrino-yielding hadrons.