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Search for new phenomena in two-body invariant mass distributions using unsupervised machine learning for anomaly detection at √s =13TeV with the ATLAS detector

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Searches for new resonances are performed using an unsupervised anomaly-detection technique. Events with at least one electron or muon are selected from 140 fb−1 of 𝑝⁢𝑝 collisions at √𝑠=13 TeV recorded by ATLAS at the Large Hadron Collider. The approach involves training an autoencoder on data, and...

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Main Authors: Aad, Georges (Author) , Baltes, Lisa Marie (Author) , Bartels, Falk (Author) , Czurylo, Marta (Author) , Dittmeier, Sebastian (Author) , Dunford, Monica (Author) , Franchino, Silvia (Author) , Junkermann, Thomas (Author) , Klassen, Martin (Author) , Mkrtchyan, Tigran (Author) , Ott, Philipp (Author) , Rassloff, Damir Fabrice (Author) , Rodriguez Bosca, Sergi (Author) , Sauer, Christof (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Sothilingam, Varsiha (Author) , Stamen, Rainer (Author) , Starovoitov, Pavel (Author) , Vigani, Luigi (Author) , Weber, Sebastian (Author) , Wessels, Martin (Author) , Zinßer, Joachim (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 23 February 2024
In: Physical review letters
Year: 2024, Volume: 132, Issue: 8, Pages: 1-23
ISSN:1079-7114
DOI:10.1103/PhysRevLett.132.081801
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevLett.132.081801
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.132.081801
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Author Notes:G. Aad et al.* (ATLAS Collaboration)
Description
Summary:Searches for new resonances are performed using an unsupervised anomaly-detection technique. Events with at least one electron or muon are selected from 140 fb−1 of 𝑝⁢𝑝 collisions at √𝑠=13 TeV recorded by ATLAS at the Large Hadron Collider. The approach involves training an autoencoder on data, and subsequently defining anomalous regions based on the reconstruction loss of the decoder. Studies focus on nine invariant mass spectra that contain pairs of objects consisting of one light jet or 𝑏 jet and either one lepton (𝑒,𝜇), photon, or second light jet or 𝑏 jet in the anomalous regions. No significant deviations from the background hypotheses are observed. Limits on contributions from generic Gaussian signals with various widths of the resonance mass are obtained for nine invariant masses in the anomalous regions.
Item Description:ATLAS Collaboration: G. Aad, L.M. Baltes, F. Bartels, M.M. Czurylo, F. Del Rio, S.J. Dittmeier, M. Dunford, S. Franchino, T. Junkermann, M. Klassen, T. Mkrtchyan, P.S. Ott, D.F. Rassloff, S. Rodriguez Bosca, C. Sauer, A. Schoening, H-C. Schultz-Coulon, V. Sothilingam, R. Stamen, P. Starovoitov, L. Vigani, S.M. Weber, M. Wessels, J. Zinsser [und viele weitere]
Gesehen am 23.10.2024
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.132.081801

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