{"work":{"id":"c3437fe4-289a-4ebc-a343-507152cd76e2","openalex_id":null,"doi":null,"arxiv_id":"1909.00761","raw_key":null,"title":"Performance of electron and photon triggers in ATLAS during LHC Run 2","authors":null,"authors_text":"ATLAS Collaboration,Performance of electron and photon triggers in ATLAS during LHC Run 2, Eur","year":2019,"venue":"hep-ex","abstract":"Electron and photon triggers covering transverse energies from 5 GeV to several TeV are essential for the ATLAS experiment to record signals for a wide variety of physics: from Standard Model processes to searches for new phenomena in both proton-proton and heavy-ion collisions. To cope with a fourfold increase of peak LHC luminosity from 2015 to 2018 (Run 2), to 2.1$\\times$10$^{34}$cm$^{-2}$s$^{-1}$, and a similar increase in the number of interactions per beam-crossing to about 60, trigger algorithms and selections were optimised to control the rates while retaining a high efficiency for physics analyses. For proton-proton collisions, the single-electron trigger efficiency relative to a single-electron offline selection is at least 75% for an offline electron of 31 GeV, and rises to 96% at 60 GeV; the trigger efficiency of a 25 GeV leg of the primary diphoton trigger relative to a tight offline photon selection is more than 96% for an offline photon of 30 GeV. For heavy-ion collisions, the primary electron and photon trigger efficiencies relative to the corresponding standard offline selections are at least 84% and 95%, respectively, at 5 GeV above the corresponding trigger threshold.","external_url":"https://arxiv.org/abs/1909.00761","cited_by_count":null,"metadata_source":"pith","metadata_fetched_at":"2026-07-08T13:54:58.731869+00:00","pith_arxiv_id":"1909.00761","created_at":"2026-05-14T17:42:31.942273+00:00","updated_at":"2026-07-08T13:54:58.731869+00:00","title_quality_ok":true,"display_title":null,"render_title":"Performance of electron and photon triggers in ATLAS during LHC Run 2"},"hub":{"state":{"work_id":"c3437fe4-289a-4ebc-a343-507152cd76e2","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":20,"external_cited_by_count":null,"distinct_field_count":3,"first_pith_cited_at":"2025-03-21T18:17:17+00:00","last_pith_cited_at":"2026-07-07T12:23:17+00:00","author_build_status":"not_needed","summary_status":"needed","contexts_status":"needed","graph_status":"needed","ask_index_status":"not_needed","reader_status":"not_needed","recognition_status":"not_needed","updated_at":"2026-08-20T01:09:59.969002+00:00","tier_text":"hub"},"tier":"hub","role_counts":[{"context_role":"background","n":5},{"context_role":"method","n":2}],"polarity_counts":[{"context_polarity":"background","n":5},{"context_polarity":"use_method","n":2}],"runs":{},"summary":{},"graph":{},"authors":[]}}