@article{b4fad4f8a6444ea395661e5d4189a58d,
title = "Anomaly detection search for new resonances decaying into a Higgs boson and a generic new particle X in hadronic final states using Formula Presented pp collisions with the ATLAS detector",
abstract = "A search is presented for a heavy resonance Formula Presented decaying into a Standard Model Higgs boson Formula Presented and a new particle Formula Presented in a fully hadronic final state. The full Large Hadron Collider run 2 dataset of proton-proton collisions at Formula Presented collected by the ATLAS detector from 2015 to 2018 is used and corresponds to an integrated luminosity of Formula Presented. The search targets the high Formula Presented-mass region, where the Formula Presented and Formula Presented have a significant Lorentz boost in the laboratory frame. A novel application of anomaly detection is used to define a general signal region, where events are selected solely because of their incompatibility with a learned background-only model. It is constructed using a jet-level tagger for signal-model-independent selection of the boosted Formula Presented particle, representing the first application of fully unsupervised machine learning to an ATLAS analysis. Two additional signal regions are implemented to target a benchmark Formula Presented decay into two quarks, covering topologies where the Formula Presented is reconstructed as either a single large-radius jet or two small-radius jets. The analysis selects Higgs boson decays into Formula Presented, and a dedicated neural-network-based tagger provides sensitivity to the boosted heavy-flavor topology. No significant excess of data over the expected background is observed, and the results are presented as upper limits on the production cross section Formula Presented) for signals with Formula Presented between 1.5 and 6 TeV and Formula Presented between 65 and 3000 GeV.",
author = "\{Atlas Collaboration\} and M. Amerl and Filmer, \{E. K.\} and P. Jackson and Kong, \{A. X.Y.\} and H. Potti and Ruggeri, \{T. A.\} and Ting, \{E. X.L.\} and White, \{M. J.\} and Gingrich, \{D. M.\} and Lindon, \{J. H.\} and N. Nishu and Pinfold, \{J. L.\} and O. Cakir and \{Duran Yildiz\}, H. and S. Kuday and \{Turk Cakir\}, I. and S. Sultansoy and \{Adam Bourdarios\}, C. and N. Berger and F. Costanza and M. Delmastro and \{Di Ciaccio\}, L. and C. Goy and T. Guillemin and T. Hryn{\textquoteright}ova and S. J{\'e}z{\'e}quel and I. Koletsou and J. Lev{\^e}que and Lewis, \{D. J.\} and Little, \{J. D.\} and \{Lorenzo Martinez\}, N. and G. Poddar and E. Rossi and \{Sanchez Pineda\}, A. and E. Sauvan and L. Selem and G. Bernardi and M. Bomben and R. Bouquet and \{Di Gregorio\}, G. and A. Li and G. Marchiori and Q. Shen and Y. Zhang and S. Chekanov and S. Darmora and Hopkins, \{W. H.\} and Hooberman, \{B. H.\} and Neubauer, \{M. S.\} and Sickles, \{A. M.\}",
note = "We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; Yerevan Physics Institute (YerPhI), Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; ANID, Chile; CAS, MOST and NSFC, China; Minciencias, Colombia; MEYS CR, Czech Republic; DNRF and Danish Natural Science Council (DNSRC), Denmark; IN2P3-CNRS and CEA-Fundamental Research Division/IRFU = Institute of Research into the Fundamental Laws of the Universe, France; Shota Rustaveli National Science Foundation of Georgia (SRNSFG), Georgia; BMBF, HGF and MPG, Germany; General Secretariat for Research and Innovation (GSRI), Greece; Research Grants Council (RGC) and Hong Kong Special Administrative Region (SAR), China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, Netherlands; Research Council of Norway (RCN), Norway; MEiN, Poland; FCT, Portugal; Ministry of National Education (MNE)/IFA, Romania; Ministry of Education, Science and Technological Development (MESTD), Serbia; Ministry of Education, Science, Research and Sport (MSSR), Slovakia; ARRS and Ministry of Education, Science and Sport (MIZ{\v S}), Slovenia; DSI/NRF, South Africa; MICINN, Spain; Swedish Research Council (SRC) and Wallenberg Foundation, Sweden; State Secretariat for Education, Research and Innovation (SERI), SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TENMAK, T{\"u}rkiye; STFC, United Kingdom; DOE and NSF, United States of America. In addition, individual groups and members have received support from BCKDF, CANARIE, Compute Canada and CRC, Canada; PRIMUS 21/SCI/017 and UNCE SCI/013, Czech Republic; European Cooperation in Science and Technology (COST), ERC, ERDF, Horizon 2020 and Marie Sk{\l}odowska-Curie Actions, European Union; Investissements d{\textquoteright}Avenir Labex, Investissements d{\textquoteright}Avenir Idex and ANR, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programs cofinanced by EU-ESF and the Greek National Strategic Reference Framework (NSRF), Greece; Binational Science Foundation - National Science Foundation (BSF-NSF) and MINERVA, Israel; Norwegian Financial Mechanism 2014-2021, Norway; NCN and NAWA, Poland; La Caixa Banking Foundation, CERCA Programme Generalitat de Catalunya and PROMETEO and GenT Programmes Generalitat Valenciana, Spain; G{\"o}ran Gustafssons Stiftelse, Sweden; The Royal Society and Leverhulme Trust, United Kingdom. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN, the ATLAS Tier-1 facilities at TRIUMF (Canada), Nordic Grid Facility (NDGF) (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-National Center for Frame Analysis (CNAF) (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), Rutherford Appleton Laboratory (RAL) (UK) and BNL (USA), the Tier-2 facilities worldwide and large non-WLCG resource providers. Major contributors of computing resources are listed in Ref. . We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; Yerevan Physics Institute (YerPhI), Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; ANID, Chile; CAS, MOST and NSFC, China; Minciencias, Colombia; MEYS CR, Czech Republic; DNRF and Danish Natural Science Council (DNSRC), Denmark; IN2P3-CNRS and CEA-Fundamental Research Division/IRFU = Institute of Research into the Fundamental Laws of the Universe, France; Shota Rustaveli National Science Foundation of Georgia (SRNSFG), Georgia; BMBF, HGF and MPG, Germany; General Secretariat for Research and Innovation (GSRI), Greece; Research Grants Council (RGC) and Hong Kong Special Administrative Region (SAR), China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, Netherlands; Research Council of Norway (RCN), Norway; MEiN, Poland; FCT, Portugal; Ministry of National Education (MNE)/IFA, Romania; Ministry of Education, Science and Technological Development (MESTD), Serbia; Ministry of Education, Science, Research and Sport (MSSR), Slovakia; ARRS and Ministry of Education, Science and Sport (MIZ{\v S}), Slovenia; DSI/NRF, South Africa; MICINN, Spain; Swedish Research Council (SRC) and Wallenberg Foundation, Sweden; State Secretariat for Education, Research and Innovation (SERI), SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TENMAK, T{\"u}rkiye; STFC, United Kingdom; DOE and NSF, United States of America. In addition, individual groups and members have received support from BCKDF, CANARIE, Compute Canada and CRC, Canada; PRIMUS 21/SCI/017 and UNCE SCI/013, Czech Republic; European Cooperation in Science and Technology (COST), ERC, ERDF, Horizon 2020 and Marie Sk{\l}odowska-Curie Actions, European Union; Investissements d{\textquoteright}Avenir Labex, Investissements d{\textquoteright}Avenir Idex and ANR, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programs cofinanced by EU-ESF and the Greek National Strategic Reference Framework (NSRF), Greece; Binational Science Foundation - National Science Foundation (BSF-NSF) and MINERVA, Israel; Norwegian Financial Mechanism 2014-2021, Norway; NCN and NAWA, Poland; La Caixa Banking Foundation, CERCA Programme Generalitat de Catalunya and PROMETEO and GenT Programmes Generalitat Valenciana, Spain; G{\"o}ran Gustafssons Stiftelse, Sweden; The Royal Society and Leverhulme Trust, United Kingdom. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN, the ATLAS Tier-1 facilities at TRIUMF (Canada), Nordic Grid Facility (NDGF) (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-National Center for Frame Analysis (CNAF) (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), Rutherford Appleton Laboratory (RAL) (UK) and BNL (USA), the Tier-2 facilities worldwide and large non-WLCG resource providers. Major contributors of computing resources are listed in Ref. [73].",
year = "2023",
month = sep,
day = "1",
doi = "10.1103/PhysRevD.108.052009",
language = "English (US)",
volume = "108",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "5",
}