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Dijet Resonance Search with Weak Supervision Using √s = 13 TeV pp Collisions in the ATLAS Detector

Aad, G

Physical review letters, 2020, Vol.125 (13), p.1 [Periódico revisado por pares]

College Park: American Physical Society

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Título:
Dijet Resonance Search with Weak Supervision Using √s = 13 TeV pp Collisions in the ATLAS Detector
Autor: Aad, G
Assuntos: Anomalies ; Anomaly detection ; body weight ; Boron compounds ; boson ; Bosons ; Confidence intervals ; Confidence levels ; Cross-sections ; Fysik ; Germanium compounds ; hadron ; human ; Invariant-mass spectra ; Jets ; Large dataset ; Large Hadron Collider ; Machine learning ; Mass spectrometry ; Natural Sciences ; Naturvetenskap ; Physical Sciences ; Potential signal ; Production cross section ; punishment ; Resonance searches ; Searching ; Signal simulation ; Subatomic Physics ; Subatomär fysik ; Topology ; Turing machines ; Weakly supervised learning
É parte de: Physical review letters, 2020, Vol.125 (13), p.1
Notas: NFR/310713
Descrição: This Letter describes a search for narrowly resonant new physics using a machine-learning anomaly detection procedure that does not rely on signal simulations for developing the analysis selection. Weakly supervised learning is used to train classifiers directly on data to enhance potential signals. The targeted topology is dijet events and the features used for machine learning are the masses of the two jets. The resulting analysis is essentially a three-dimensional search A → BC, for mA ∼ O ( TeV ), mB, mC ∼ O ( 100 GeV ) and B, C are reconstructed as large-radius jets, without paying a penalty associated with a large trials factor in the scan of the masses of the two jets. The full run 2 √s = 13 TeV pp collision dataset of 139 fb−1 recorded by the ATLAS detector at the Large Hadron Collider is used for the search. There is no significant evidence of a localized excess in the dijet invariant mass spectrum between 1.8 and 8.2 TeV. Cross-section limits for narrow-width A, B, and C particles vary with mA, mB, and mC. For example, when m A = 3 TeV and m B ≳ 200 GeV , a production cross section between 1 and 5 fb is excluded at 95% confidence level, depending on m C . For certain masses, these limits are up to 10 times more sensitive than those obtained by the inclusive dijet search. These results are complementary to the dedicated searches for the case that B and C are standard model bosons.
Editor: College Park: American Physical Society
Idioma: Inglês;Norueguês

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Dijet Resonance Search with Weak Supervision Using √s = 13 TeV pp Collisions in the ATLAS Detector

Aad, G

College Park: American Physical Society

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