Search for displaced photons produced in exotic decays of the Higgs boson using 13 TeV $pp$ collisions with the ATLAS detector
| Autor: | ATLAS Collaboration |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
photon: trajectory
p p: scattering radiative decay [neutral particle] transverse momentum: missing-energy trajectory [photon] exotic [decay] 13000 GeV-cms electromagnetic [calorimeter] FOS: Physical sciences branching ratio: upper limit [Higgs particle] channel cross section: upper limit photon: particle identification High Energy Physics - Experiment High Energy Physics - Experiment (hep-ex) neutral particle: pair production neutral particle: long-lived scattering [p p] long-lived [neutral particle] photon: production pair production [neutral particle] upper limit [channel cross section] background production [photon] particle identification [photon] rare decay [Higgs particle] Higgs particle: rare decay ATLAS time delay calorimeter: electromagnetic CERN LHC Coll Higgs particle: branching ratio: upper limit missing-energy [transverse momentum] neutral particle: radiative decay colliding beams [p p] decay: exotic p p: colliding beams Particle Physics - Experiment experimental results |
| DOI: | 10.3204/PUBDB-2022-05077 |
| Popis: | 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 data set of proton-proton collisions delivered by the LHC at a center-of-mass energy of $\sqrt{s}=13$ 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. 29 pages in total, no author list, 11 figures, 2 tables, submitted to Phys. Rev. D. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2019-14 |
| Databáze: | OpenAIRE |
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