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Kasieczka G, Nachman B, Shih D, Amram O, Andreassen A, Benkendorfer K, Bortolato B, Brooijmans G, Canelli F, Collins JH, Dai B, De Freitas FF, Dillon BM, Dinu IM, Dong Z, Donini J, Duarte J, Faroughy DA, Gonski J, Harris P, Kahn A, Kamenik JF, Khosa CK, Komiske P, Le Pottier L, Martín-Ramiro P, Matevc A, Metodiev E, Mikuni V, Murphy CW, Ochoa I, Park SE, Pierini M, Rankin D, Sanz V, Sarda N, Seljak U, Smolkovic A, Stein G, Suarez CM, Szewc M, Thaler J, Tsan S, Udrescu SM, Vaslin L, Vlimant JR, Williams D, Yunus M. The LHC Olympics 2020 a community challenge for anomaly detection in high energy physics. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2021; 84. [PMID: 34736231 DOI: 10.1088/1361-6633/ac36b9] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2021] [Accepted: 11/04/2021] [Indexed: 05/11/2023]
Abstract
A new paradigm for data-driven, model-agnostic new physics searches at colliders is emerging, and aims to leverage recent breakthroughs in anomaly detection and machine learning. In order to develop and benchmark new anomaly detection methods within this framework, it is essential to have standard datasets. To this end, we have created the LHC Olympics 2020, a community challenge accompanied by a set of simulated collider events. Participants in these Olympics have developed their methods using an R&D dataset and then tested them on black boxes: datasets with an unknown anomaly (or not). Methods made use of modern machine learning tools and were based on unsupervised learning (autoencoders, generative adversarial networks, normalizing flows), weakly supervised learning, and semi-supervised learning. This paper will review the LHC Olympics 2020 challenge, including an overview of the competition, a description of methods deployed in the competition, lessons learned from the experience, and implications for data analyses with future datasets as well as future colliders.
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Affiliation(s)
| | - Benjamin Nachman
- Physics Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
- Berkeley Institute for Data Science, University of California, Berkeley, CA 94720, United States of America
| | - David Shih
- NHETC, Department of Physics & Astronomy, Rutgers University, Piscataway, NJ 08854, United States of America
| | - Oz Amram
- Department of Physics & Astronomy, The Johns Hopkins University, Baltimore, MD 21211, United States of America
| | | | - Kees Benkendorfer
- Physics Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
- Physics Department, Reed College, Portland, OR 97202, United States of America
| | - Blaz Bortolato
- Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
| | - Gustaaf Brooijmans
- Nevis Laboratories, Columbia University, 136 S Broadway, Irvington NY 10533, United States of America
| | - Florencia Canelli
- Physik Institut, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Jack H Collins
- SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94309, United States of America
| | - Biwei Dai
- Berkeley Center for Cosmological Physics, University of California, Berkeley, United States of America
| | - Felipe F De Freitas
- Departamento de Física da Universidade de Aveiro and CIDMA Campus de Santiago, 3810-183 Aveiro, Portugal
| | - Barry M Dillon
- Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
- Institute for Theoretical Physics, University of Heidelberg, Heidelberg, Germany
| | - Ioan-Mihail Dinu
- Laboratoire de Physique de Clermont, Université Clermont Auvergne, France
| | - Zhongtian Dong
- Department of Physics & Astronomy, University of Kansas, 1251 Wescoe Hall Dr, Lawrence, KS 66045, United States of America
| | - Julien Donini
- Laboratoire de Physique de Clermont, Université Clermont Auvergne, France
| | - Javier Duarte
- University of California San Diego, La Jolla, CA 92093, United States of America
| | - D A Faroughy
- Physik Institut, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Julia Gonski
- Nevis Laboratories, Columbia University, 136 S Broadway, Irvington NY 10533, United States of America
| | - Philip Harris
- Laboratory for Nuclear Science, MIT, 77 Massachusetts Ave, Cambridge, MA 02139, United States of America
| | - Alan Kahn
- Nevis Laboratories, Columbia University, 136 S Broadway, Irvington NY 10533, United States of America
| | - Jernej F Kamenik
- Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
- Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia
| | - Charanjit K Khosa
- Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH, United Kingdom
- Department of Physics, University of Genova, Via Dodecaneso 33, 16146 Genova, Italy
| | - Patrick Komiske
- Center for Theoretical Physics, MIT, 77 Massachusetts Ave, Cambridge, MA 02139, United States of America
| | - Luc Le Pottier
- Physics Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
- Physics Department, University of Michigan, Ann Arbor, MI 48109, United States of America
| | - Pablo Martín-Ramiro
- Physics Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
- Instituto de Física Teórica, IFT-UAM/CSIC, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Andrej Matevc
- Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
- Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia
| | - Eric Metodiev
- Center for Theoretical Physics, MIT, 77 Massachusetts Ave, Cambridge, MA 02139, United States of America
| | - Vinicius Mikuni
- Physik Institut, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | | | - Inês Ochoa
- Laboratory of Instrumentation and Experimental Particle Physics, Lisbon, Portugal
| | - Sang Eon Park
- Laboratory for Nuclear Science, MIT, 77 Massachusetts Ave, Cambridge, MA 02139, United States of America
| | - Maurizio Pierini
- European Organization for Nuclear Research (CERN), CH-1211, Geneva 23, Switzerland
| | - Dylan Rankin
- Laboratory for Nuclear Science, MIT, 77 Massachusetts Ave, Cambridge, MA 02139, United States of America
| | - Veronica Sanz
- Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH, United Kingdom
- Instituto de Física Corpuscular (IFIC), Universidad de Valencia-CSIC, E-46980, Valencia, Spain
| | - Nilai Sarda
- CSAIL, Massachusetts Institute of Technology, 32 Vassar Street, Cambridge, MA 02139, United States of America
| | - Urŏ Seljak
- Physics Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
- Berkeley Institute for Data Science, University of California, Berkeley, CA 94720, United States of America
- Berkeley Center for Cosmological Physics, University of California, Berkeley, United States of America
| | | | - George Stein
- Physics Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
- Berkeley Center for Cosmological Physics, University of California, Berkeley, United States of America
| | - Cristina Mantilla Suarez
- Department of Physics & Astronomy, The Johns Hopkins University, Baltimore, MD 21211, United States of America
| | - Manuel Szewc
- International Center for Advanced Studies and CONICET, UNSAM, CP1650, Buenos Aires, Argentina
| | - Jesse Thaler
- Center for Theoretical Physics, MIT, 77 Massachusetts Ave, Cambridge, MA 02139, United States of America
| | - Steven Tsan
- University of California San Diego, La Jolla, CA 92093, United States of America
| | - Silviu-Marian Udrescu
- Laboratory for Nuclear Science, MIT, 77 Massachusetts Ave, Cambridge, MA 02139, United States of America
| | - Louis Vaslin
- Laboratoire de Physique de Clermont, Université Clermont Auvergne, France
| | - Jean-Roch Vlimant
- Division Office Physics, Math and Astronomy, California Institute of Technology, Pasadena, CA 91125, United States of America
| | - Daniel Williams
- Nevis Laboratories, Columbia University, 136 S Broadway, Irvington NY 10533, United States of America
| | - Mikaeel Yunus
- Laboratory for Nuclear Science, MIT, 77 Massachusetts Ave, Cambridge, MA 02139, United States of America
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