https://doi.org/10.1140/epjc/s10052-020-7672-9
Regular Article - Theoretical Physics
Beyond 
: learning to search for a broad 
resonance at the LHC
Center for Theoretical Physics, Department of Physics and Astronomy, Seoul National University, 08826, Seoul, South Korea
Received:
2
August
2019
Accepted:
25
January
2020
Published online:
8
February
2020
A resonance peak in the invariant mass spectrum has been the main feature of a particle at collider experiments. However, broad resonances not exhibiting such a sharp peak are generically predicted in new physics models beyond the Standard Model. Without a peak, how do we discover a broad resonance at colliders? We use machine learning technique to explore answers beyond common knowledge. We learn that, by applying deep neural network to the case of a resonance, the invariant mass is still useful, but additional information from off-resonance region, angular correlations, 
, and top jet mass are also significantly important. As a result, the improved LHC sensitivities do not depend strongly on the width. The results may also imply that the additional information can be used to improve narrow-resonance searches too. Further, we also detail how we assess machine-learned information.
© The Author(s) 2020
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