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Public Heavy Ion Trigger Plots for Collision Data

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2017 XeXe Data

Performance of Level-1 total energy triggers for low-pT diphoton events ATL-COM-DAQ-2018-036 (May 27, 2018)

Distribution of total transverse energy (TE) at Level-1 in minimum-bias events (black circles) and exclusive e+e- event candidates (blue squares) in Xe+Xe data. The minimum-bias events are selected using a logical OR of two triggers, first one requiring Level-1 TE less than 4 GeV and at least one track at HLT and a second one requiring Level-1 TE greater than 4 GeV. The offline event selection is made for the purpose of Level-1 TE trigger efficiency measurement. The exclusive e+e- pairs have a very similar signature to diphoton events that we are interested in, but they have larger production cross-section. The exclusive e+e- event candidates are selected offline by a set of requirements: exactly two oppositely-charged tracks with pT > 1 GeV matched to electromagnetic clusters with ΔR < 0.7 and accompanied by the minor detector activity described by the sum of pT of remaining tracks to be less than 2 GeV. Two tracks are required to be in a back-to-back configuration in the azimuthal angle (acoplanarity < 0.2). The shaded area around the points represents statistical uncertainties. L1TE.png
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Efficiency of total transverse energy (TE) triggers at Level-1: TE4 (full circles) and TE5 (open squares), with optimised Level-1 calorimeter noise settings as a function of the sum of transverse energy of two electromagnetic clusters satisfying the exclusive e+e- event selection in Xe+Xe data. Triggers have 4 GeV and 5 GeV thresholds on TE at Level-1, respectively. The fit represents a Level-1 TE5 trigger efficiency measured in 2015 Pb+Pb data using non-optimised Level-1 calorimeter noise settings. The comparison proves higher trigger efficiency after optimization. The trigger efficiency is measured in minimum-bias events selected by a logical OR of two triggers, first one requiring Level-1 TE less than 4 GeV and at least one track at HLT and a second one requiring Level-1 TE greater than 4 GeV. The exclusive e+e- event candidates are selected offline by a set of requirements: exactly two oppositely-charged tracks with pT > 1 GeV matched to electromagnetic clusters with ΔR < 0.7 and accompanied by the minor detector activity described by the sum of p_T of remaining tracks to be less than 2 GeV. Two tracks are required to be in a back-to-back configuration in the azimuthal angle (acoplanarity < 0.2). ETeff_loose.png
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Correlation between transverse energy of two offline electromagnetic clusters matched to offline tracks satisfying the exclusive e+e- candidate requirements in Xe+Xe data. The exclusive e+e- event candidates are selected offline by a set of requirements: exactly two oppositely-charged tracks with pT > 1 GeV matched to electromagnetic clusters with ΔR < 0.7 and accompanied by the minor detector activity described by the sum of pT of remaining tracks to be less than 2 GeV. Two tracks are required to be in a back-to-back configuration in the azimuthal angle (acoplanarity < 0.2). ET_ETloose.png
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Acoplanarity distribution of two tracks from the exclusive e+e- event candidates in Xe+Xe data. The exclusive e+e- event candidates are selected offline by a set of requirements: exactly two oppositely charged tracks with pT > 1 GeV matched to electromagnetic clusters with ΔR < 0.7 and accompanied by the minor detector activity described by the sum of pT of remaining tracks to be less than 2 GeV. Two tracks are required to be in a back-to-back configuration in the azimuthal angle (acoplanarity < 0.2). ATL_COM_TDAQ_Fig1_Acoplanarity.png
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Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf ATL_COM_DAQ_Fig1_Acoplanarity.pdf r2 r1 manage 24.8 K 2018-05-28 - 01:59 AgnieszkaSmaga 2017 XeXe data, trigger for diphoton events
PNGpng ATL_COM_DAQ_Fig1_Acoplanarity.png r2 r1 manage 16.2 K 2018-05-28 - 01:38 AgnieszkaSmaga 2017 XeXe data, trigger for diphoton events
PDFpdf ATL_COM_DAQ_Fig1_ClusterEnergies2D.pdf r1 manage 54.0 K 2018-05-27 - 08:53 JoergStelzer 2017 XeXe data, trigger for diphoton events
PNGpng ATL_COM_DAQ_Fig1_ClusterEnergies2D.png r1 manage 91.9 K 2018-05-27 - 08:46 JoergStelzer 2017 XeXe data, trigger for diphoton events
PDFpdf ATL_COM_DAQ_Fig1_L1TEMinBiasAndEE.pdf r1 manage 69.0 K 2018-05-27 - 08:53 JoergStelzer 2017 XeXe data, trigger for diphoton events
PNGpng ATL_COM_DAQ_Fig1_L1TEMinBiasAndEE.png r1 manage 121.0 K 2018-05-27 - 08:46 JoergStelzer 2017 XeXe data, trigger for diphoton events
PDFpdf ATL_COM_DAQ_Fig1_L1TETurnOn2015and2017.pdf r1 manage 65.0 K 2018-05-27 - 08:53 JoergStelzer 2017 XeXe data, trigger for diphoton events
PNGpng ATL_COM_DAQ_Fig1_L1TETurnOn2015and2017.png r1 manage 110.4 K 2018-05-27 - 08:46 JoergStelzer 2017 XeXe data, trigger for diphoton events
Unknown file formateps ATL_COM_TDAQ_Fig1_Acoplanarity.eps r1 manage 11.8 K 2018-05-28 - 02:53 AgnieszkaSmaga 2017 XeXe data, trigger fot diphoton events
PDFpdf ATL_COM_TDAQ_Fig1_Acoplanarity.pdf r1 manage 24.8 K 2018-05-28 - 01:14 AgnieszkaSmaga 2017 XeXe data, trigger for diphoton events
PNGpng ATL_COM_TDAQ_Fig1_Acoplanarity.png r1 manage 16.2 K 2018-05-28 - 02:28 AgnieszkaSmaga 2017 XeXe data, trigger for diphoton events
Unknown file formateps ET_ETloose.eps r1 manage 11.2 K 2018-05-28 - 02:53 AgnieszkaSmaga 2017 XeXe data, trigger fot diphoton events
PDFpdf ET_ETloose.pdf r1 manage 14.3 K 2018-05-28 - 02:16 AgnieszkaSmaga 2017 XeXe data, trigger for diphoton events
PNGpng ET_ETloose.png r1 manage 14.9 K 2018-05-28 - 02:16 AgnieszkaSmaga 2017 XeXe data, trigger for diphoton events
Unknown file formateps ETeff_loose.eps r1 manage 11.7 K 2018-05-28 - 02:53 AgnieszkaSmaga 2017 XeXe data, trigger fot diphoton events
PDFpdf ETeff_loose.pdf r1 manage 15.3 K 2018-05-28 - 02:16 AgnieszkaSmaga 2017 XeXe data, trigger for diphoton events
PNGpng ETeff_loose.png r1 manage 19.4 K 2018-05-28 - 02:16 AgnieszkaSmaga 2017 XeXe data, trigger for diphoton events
Unknown file formateps L1TE.eps r1 manage 690.8 K 2018-05-28 - 02:53 AgnieszkaSmaga 2017 XeXe data, trigger fot diphoton events
PDFpdf L1TE.pdf r1 manage 462.3 K 2018-05-28 - 02:16 AgnieszkaSmaga 2017 XeXe data, trigger for diphoton events
PNGpng L1TE.png r1 manage 19.1 K 2018-05-28 - 02:16 AgnieszkaSmaga 2017 XeXe data, trigger for diphoton events
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Topic revision: r2 - 2018-05-28 - AgnieszkaSmaga
 
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