1 Ocak 2020 Dergi makalesi Açık Erişim

CERN İşbirliği

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{
  "DOI": "10.1140/epjc/s10052-019-7500-2", 
  "abstract": "<p>Electron and photon triggers covering transverse energies from 5   $\\text{GeV}\\phantom{\\rule{0.333333em}{0ex}}$  to several   $\\text{TeV}\\phantom{\\rule{0.333333em}{0ex}}$  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\u2013proton and heavy-ion collisions. To cope with a fourfold increase of peak LHC luminosity from 2015 to 2018 (Run 2), to   $2.1\u00d7{10}^{34}\\phantom{\\rule{0.166667em}{0ex}}{\\text{cm}}^{-2}\\phantom{\\rule{0.333333em}{0ex}}{\\text{s}}^{-1}$ , 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\u2013proton collisions, the single-electron trigger efficiency relative to a single-electron offline selection is at least 75% for an offline electron of 31   $\\text{GeV}\\phantom{\\rule{0.333333em}{0ex}}$ , and rises to 96% at 60   $\\text{GeV}\\phantom{\\rule{0.333333em}{0ex}}$ ; the trigger efficiency of a 25   $\\text{GeV}\\phantom{\\rule{0.333333em}{0ex}}$  leg of the primary diphoton trigger relative to a tight offline photon selection is more than 96% for an offline photon of 30   $\\text{GeV}\\phantom{\\rule{0.333333em}{0ex}}$ . 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   $\\text{GeV}\\phantom{\\rule{0.333333em}{0ex}}$  above the corresponding trigger threshold.</p>", 
  "author": [
    {
      "family": "CERN \u0130\u015fbirli\u011fi"
    }
  ], 
  "container_title": "European Physical Journal C", 
  "id": "105427", 
  "issue": "1", 
  "issued": {
    "date-parts": [
      [
        2020, 
        1, 
        1
      ]
    ]
  }, 
  "title": "Performance of electron and photon triggers in ATLAS during LHC Run 2", 
  "type": "article-journal", 
  "volume": "80"
}