fwXmachina example: Anomaly detection

This dataset provides a ROOT file with three trees: - "background" includes events of all SM processes with final state e+ e- mu+ mu-, dominated by ZZ* - "h2e2mu-1" includes events from the BSM decay H-->a1 a2, for Higgs mass of 70 GeV and Higgs-like scalars a1 [25 GeV] and a2 [30 GeV]. These further decay like a1 --> e+ e-, a2 --> mu+ mu- - "h2e2mu-2" includes events from the BSM decay H-->a1 a2, for Higgs mass of 125 GeV and Higgs-like scalars a1 [10 GeV] and a2 [15 GeV]. These further decay like a1 --> e+ e-, a2 --> mu+ mu- Each tree contains the same variables: pT, eta, and phi for both electrons and both muons, and the m_ee, m_mumu, and m_eemumu invariant masses. Only events with exactly two reconstructed muons and two reconstructed electrons were included. All events were produced with MadGraph. BSM decays and hadronization were performed with Pythia8 with the ATLAS AZ 17 tune. Showering, event reconstruction, and detector simulation was performed with Delphes. Pseudorapidity/phi coordinates were used with eta between -4.9 --> 4.9 and phi between -pi --> pi. Minimum bias pileup with <mu> = 50 was applied using the CMS with pileup card in Delphes. All Higgs production is via the gluon-gluon fusion (ggF) channel. In MadGraph, the Higgs effective field theory (HEFT) model is used for all signal and background production.本数据集提供一份ROOT格式文件，内含三个树结构： - "background"树包含所有标准模型（Standard Model, SM）过程中末态为e+ e- μ+ μ-的事例，其主导贡献来自ZZ*过程。 - "h2e2mu-1"树包含来自超出标准模型（Beyond the Standard Model, BSM）衰变H→a1 a2的事例，对应希格斯玻色子质量为70 GeV，类希格斯标量粒子a1质量为25 GeV、a2质量为30 GeV。此类事例后续衰变模式为a1 → e+ e-、a2 → μ+ μ-。 - "h2e2mu-2"树包含来自BSM衰变H→a1 a2的事例，对应希格斯玻色子质量为125 GeV，类希格斯标量粒子a1质量为10 GeV、a2质量为15 GeV。此类事例后续衰变模式为a1 → e+ e-、a2 → μ+ μ-。 每棵树均包含完全一致的物理变量：对应两个电子与两个μ子的横向动量（transverse momentum, pT）、赝快度（pseudorapidity, η）与方位角φ，以及不变质量m_ee、m_mumu和m_eemumu。仅保留恰好重建出两个μ子与两个电子的事例。 所有事例均通过MadGraph生成。BSM衰变与强子化过程由Pythia8完成，并采用ATLAS AZ 17 tune参数设置。簇射模拟、事例重建与探测器模拟均通过Delphes实现。赝快度与方位角的坐标取值范围为η∈[-4.9, 4.9]、φ∈[-π, π]。通过Delphes内置的CMS叠加事例卡片，应用了平均叠加数<μ> = 50的最小偏置叠加事例。所有希格斯玻色子均通过胶子熔合（gluon-gluon fusion, ggF）道产生。在MadGraph中，所有信号与背景样本的生成均采用希格斯有效场论（Higgs Effective Field Theory, HEFT）模型。