3 Mayıs 2024 Dergi makalesi Açık Erişim

CERN İşbirliği

Dublin Core

<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>CERN İşbirliği</dc:creator>
  <dc:date>2024-05-03</dc:date>
  <dc:description>Clusters of topologically connected calorimeter cells around cells with large absolute signal-to-noise ratio (topo-clusters) are the basis for calorimeter signal reconstruction in the ATLAS experiment. Topological cell clustering has proven performant in LHC Runs 1 and 2. It is, however, susceptible to out-of-time pile-up of signals from soft collisions outside the 25 ns proton-bunch-crossing window associated with the event's hard collision. To reduce this effect, a calorimeter-cell timing criterion was added to the signal-to-noise ratio requirement in the clustering algorithm. Multiple versions of this criterion were tested by reconstructing hadronic signals in simulated events and Run 2 ATLAS data. The preferred version is found to reduce the out-of-time pile-up jet multiplicity by     $\sim 50%$   for jet     ${p}_{\text{T}}\sim 20$   GeV and by     $\sim 80%$   for jet     ${p}_{\text{T}}\gtrsim 50$   GeV, while not disrupting the reconstruction of hadronic signals of interest, and improving the jet energy resolution by up to 5% for     $20&lt;{p}_{\text{T}}&lt;30$   GeV. Pile-up is also suppressed for other physics objects based on topo-clusters (electrons, photons,     $\tau $  -leptons), reducing the overall event size on disk by about     $6%$   in early Run 3 pile-up conditions. Offline reconstruction for Run 3 includes the timing requirement.</dc:description>
  <dc:identifier>https://aperta.ulakbim.gov.trrecord/275093</dc:identifier>
  <dc:identifier>oai:aperta.ulakbim.gov.tr:275093</dc:identifier>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>http://www.opendefinition.org/licenses/cc-by</dc:rights>
  <dc:source>European Physical Journal C 84(5)</dc:source>
  <dc:title>Improving topological cluster reconstruction using calorimeter cell timing in ATLAS</dc:title>
  <dc:type>info:eu-repo/semantics/article</dc:type>
  <dc:type>publication-article</dc:type>
</oai_dc:dc>