论文标题
可行性研究，用于测量$ \ bar {p} p \rightarrowμ^+μ^ - $ \ at $ \ overline {\ textrm {p}} \ textrm {anda} $的可行性研究。
Feasibility studies for the measurement of time-like proton electromagnetic form factors from $\bar{p}p \rightarrow μ^+μ^-$ at $\overline{\textrm{P}}\textrm{ANDA}$ at FAIR
论文作者
论文摘要
本文报告了Monte Carlo模拟结果，以未来测量类似时间的质子电磁形式，$ | g_ {e} | $和$ | g_ {m} | $，使用$ \ bar {p} p} p \rightarrowμ^ $ \ OVILLINE {\ textrm {p}}} \ textrm {anda} $（fair）。电磁形式因子是对黑德子的电和磁性结构进行参数量的基本量。这项工作估算了可以使用Pandaroot软件框架中的模拟数据分析，估计可以在$ \ overline {\ textrm {p}}} \ textrm {anda} $中测量形式因素的统计和总准确性。最关键的背景通道是$ \ bar {p} p \rightArrowπ^{+}π^{ - } $，这是由于检测器中的muons和pions的行为非常相似。在抗蛋白质束动量的不同值下，评估了该和所有其他相关背景通道的抑制因子。信号/背景分离基于使用增强决策树方法的多元分析。基于背景贡献的逼真的角度分布，本研究中包括了预期的背景减法。考虑了系统的不确定性，并提出了形态因子测量的相对总不确定性。
This paper reports on Monte Carlo simulation results for future measurements of time-like proton electromagnetic form factors, $|G_{E}|$ and $|G_{M}|$, using the $\bar{p} p \rightarrow μ^{+} μ^{-}$ reaction at $\overline{\textrm{P}}\textrm{ANDA}$ (FAIR). The electromagnetic form factors are fundamental quantities parameterizing the electric and magnetic structure of hadrons. This work estimates the statistical and total accuracy with which the form factors can be measured at $\overline{\textrm{P}}\textrm{ANDA}$, using an analysis of simulated data within the PandaRoot software framework. The most crucial background channel is $\bar{p} p \rightarrow π^{+} π^{-}$, due to the very similar behavior of muons and pions in the detector. The suppression factors are evaluated for this and all other relevant background channels at different values of antiproton beam momentum. The signal/background separation is based on a multivariate analysis, using the Boosted Decision Trees method. An expected background subtraction is included in this study, based on realistic angular distributions of the background contribution. Systematic uncertainties are considered and the relative total uncertainties of the form factor measurements are presented.
