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2019

Effective LHC measurements with matrix elements and machine learning

Brehmer, Johann, Cranmer, Kyle, Espejo, Irina et al.

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One major challenge for the legacy measurements at the LHC is that the likelihood function is not tractable when the collected data is high-dimensional and the detector response has to be modeled.

We review how different analysis strategies solve this issue, including the traditional histogram approach used in most particle physics analyses, the Matrix Element Method, Optimal Observables, and modern techniques based on neural density estimation.
We then discuss powerful new inference methods that use a combination of matrix element information and machine learning to accurately estimate the likelihood function.
The MadMiner package automates all necessary data-processing steps.

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