"Figure 4 - bottom right, high pt DeepTau vs jet" of "Identification of hadronic tau lepton decays using a deep neural network"

Efficiency for quark and gluon jets to pass different tau identification discriminators versus the efficiency for genuine tau_h. The upper two plots are obtained with jets from the W+jets simulated sample and the lower two plots with jets from the tt sample. The left two plots include jets and genuine tau_h with pt < 100 GeV, whereas the right two plots include those with pt > 100 GeV. The working points are indicated as full circles. The efficiency for jets from the W+jets event sample, enriched in quark jets, to pass the discriminators is higher compared to jets from the tt event sample, which has a larger fraction of gluon and b-quark jets. The jet efficiency for a given tau_h efficiency is larger for jets and tau_h with pt < 100 GeV than for those with pt > 100 GeV. Compared with the previously used MVA discriminator, the DEEPTAU discriminator reduces the jet efficiency for a given tau_h efficiency by consistently more than a factor of 1.8, and by more at high tau_h efficiency. The additional gain at high pt comes from the inclusion of updated decay modes in the tau_h reconstruction, as illustrated by the curves for the previously used MVA discriminator but including reconstructed tau_h candidates with additional decay modes.

本数据集呈现夸克喷注与胶子喷注通过各类τ粒子识别鉴别器的效率，与真实强子衰变τ轻子（tau_h）识别效率之间的对比关系。上方两幅图基于W+喷注模拟样本中的喷注生成，下方两幅图则基于顶夸克对（tt）样本中的喷注生成。左侧两幅图涵盖横向动量（pt）小于100 GeV的喷注与真实tau_h样本，右侧两幅图则涵盖横向动量大于100 GeV的对应样本。图中工作点以实心圆点标注。
以夸克喷注为主的W+喷注事件样本，其喷注通过鉴别器的效率高于顶夸克对事件样本——后者胶子喷注与b夸克喷注的占比更高。在给定真实tau_h识别效率的前提下，横向动量小于100 GeV的喷注与tau_h对应的喷注误识别效率，高于横向动量大于100 GeV的对应样本。
与此前使用的多变量分析（MVA）鉴别器相比，DEEPTAU鉴别器在给定真实tau_h识别效率下，可持续将喷注误识别效率降低1.8倍以上，且在高tau_h识别效率区间的降幅更为显著。高横向动量区间的额外性能增益，源于tau_h重建过程中纳入了更新后的衰变模式：此前所用MVA鉴别器的曲线（纳入了带有额外衰变模式的重建tau_h候选体）可对此予以佐证。