@misc{10481/85675,
year = {2023},
month = {8},
url = {https://hdl.handle.net/10481/85675},
abstract = {A search is performed for delayed and nonpointing photons originating from the displaced decay of a
neutral long-lived particle (LLP). The analysis uses the full run 2 dataset of proton-proton collisions
delivered by the LHC at a center-of-mass energy of ffisffiffi
p
¼ 13 TeV between 2015 and 2018 and recorded by
the ATLAS detector, corresponding to an integrated luminosity of 139 fb−1. The capabilities of the ATLAS
electromagnetic calorimeter are exploited to precisely measure the arrival times and trajectories of photons.
The results are interpreted in a scenario where the LLPs are pair produced in exotic decays of the 125 GeV
Higgs boson, and each LLP subsequently decays into a photon and a particle that escapes direct detection,
giving rise to missing transverse momentum. No significant excess is observed above the expectation due
to Standard Model background processes. The results are used to set upper limits on the branching ratio of
the exotic decay of the Higgs boson. A model-independent limit is also set on the production of photons
with large values of displacement and time delay},
organization = {France},
organization = {Federal Ministry of Education & Research (BMBF)},
organization = {Max Planck Society},
organization = {RGC and Hong Kong SAR, China},
organization = {Israel Science Foundation},
organization = {Istituto Nazionale di Fisica Nucleare (INFN)},
organization = {Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)},
organization = {Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)
Japan Society for the Promotion of Science},
organization = {CNRST, Morocco; NWO, Netherlands},
organization = {RCN, Norway},
organization = {MEiN, Poland},
organization = {Fundacao para a Ciencia e a Tecnologia (FCT)},
organization = {MNE/IFA, Romania},
organization = {Ministry of Education, Science & Technological Development, Serbia},
organization = {MSSR, Slovakia},
organization = {Slovenian Research Agency - Slovenia},
organization = {Spanish Government},
organization = {SRC},
organization = {Wallenberg Foundation, Sweden},
organization = {Swiss National Science Foundation (SNSF)},
organization = {Ministry of Science and Technology, Taiwan},
organization = {UK Research & Innovation (UKRI)
Science & Technology Facilities Council (STFC)},
organization = {United States Department of Energy (DOE)},
organization = {National Science Foundation (NSF)},
organization = {BCKDF},
organization = {CANARIE},
organization = {CRC, Canada	UNCE SCI/013},
organization = {Czech Republic Government},
organization = {European Research Council (ERC)},
organization = {European Union (EU)},
organization = {Agence Nationale de la Recherche (ANR)},
organization = {German Research Foundation (DFG)},
organization = {Alexander von Humboldt Foundation},
organization = {European Union (EU)},
organization = {Greek NSRF, Greece},
organization = {BSF-NSF},
organization = {NCN},
organization = {La Caixa Foundation},
organization = {CERCA Programme Generalitat de Catalunya},
organization = {PROMETEO},
organization = {Center for Forestry Research & Experimentation (CIEF)},
organization = {Gran Gustafssons Stiftelse, Sweden},
organization = {Royal Society},
organization = {Leverhulme Trust},
organization = {NDGF (Denmark, Norway, Sweden)},
organization = {KIT/GridKA (Germany)},
organization = {INFN-CNAF (Italy)},
organization = {NL-T1 (Netherlands) , PIC (Spain)},
organization = {ASGC (Taiwan)},
organization = {BNL (USA)},
publisher = {American Physical Society},
title = {Search for displaced photons produced in exotic decays of the Higgs boson using 13 TeV pp collisions with the ATLAS detector},
author = {Atlas Collaboration and Aguilar Saavedra, Juan Antonio and Rodríguez Chala, Mikael},
}