Mitigation of pileup effects at the LHC

Europe/Zurich
4/3-006 - TH Conference Room (CERN)

4/3-006 - TH Conference Room

CERN

19
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Ariel Gustavo Schwartzman (SLAC National Accelerator Laboratory (US)) , Filip Moortgat (CERN) , Gavin Salam (CERN)
Description
Pileup is one of the limiting factors in many LHC studies and the experiments’ ability to control its adverse effects can even affect decisions on machine running.

The purpose of this workshop is to bring together the community of people with experience in pileup mitigation at the LHC, in order to foster exchanges on a range of new ideas that are currently emerging in the field.

Topics to be covered include
  • generic jet use, i.e. correcting jet transverse momenta and suppression of pileup jets
  • advanced jet use, correcting shapes and masses and groomers/taggers
  • questions such as whether to correct whole jet observables (pt, mass), the particle within a jet, or even attempt event-wide PU correction
  • interplay of these questions with different experimental jet reconstruction methods (detector effects, topoclustering and particle flow, detector noise suppression, etc.)
  • pileup in contexts beyond jets, such as lepton & photon isolation and missing transverse energy measurements
  • how best to perform comparisons between different experiments and with theorists’ studies
The workshop will include ample hands-on sessions for trying out and sharing PU mitigation code and results, using standalone simulations and code.

It will run over a long weekend, from the morning of Friday May 16th until late afternoon on Sunday May 18th.
 
There is a mailing list for follow up work: lpcc-pu-mitigation@cern.ch
 


 

software
Participants
  • Ariel Schwartzman
  • Ben Cooper
  • Bibhuprasad Mahakud
  • Bibhuti Parida
  • Chayanit Asawatangtrakuldee
  • Christopher Young
  • David Lopez Mateos
  • David Sosa
  • Filip Moortgat
  • Frédéric Dreyer
  • Gagan Mohanty
  • Gavin Salam
  • Gregory Soyez
  • Janna Katharina Behr
  • Jeffrey Berryhill
  • Jeffrey Tseng
  • Lily Asquith
  • Luca Brianza
  • Martina Malberti
  • Matteo Cacciari
  • Matthew Low
  • Matthew Schwartz
  • Matthieu Pierre Marionneau
  • Maximilian J Swiatlowski
  • Michael Begel
  • Mikko Voutilainen
  • Nhan Viet Tran
  • Pascal Nef
  • Peter Berta
  • Peter Loch
  • Peter Skands
  • Philip Coleman Harris
  • Raffaele Angelo Gerosa
  • Saranya Samik Ghosh
  • Simone Amoroso
  • Soureek Mitra
  • Walter Hopkins
  • Yue Shi Lai
    • New PU removal techniques 60/6-015 - Room Georges Charpak (Room F)

      60/6-015 - Room Georges Charpak (Room F)

      CERN

      20
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      Conveners: Michael Begel (Brookhaven National Laboratory (US)) , Philip Coleman Harris (CERN)
      • 1
        Introduction
        Speakers: Ariel Gustavo Schwartzman (SLAC National Accelerator Laboratory (US)) , Filip Moortgat (CERN) , Gavin Salam (CERN)
        Slides
      • 2
        Jet-Vertex Tagging and track-based grooming
        Speaker: Pascal Nef (SLAC National Accelerator Laboratory (US))
        Slides
      • 3
        NpC
        Speaker: Matteo Cacciari (LPTHE Paris)
        Slides
      • 10:45 AM
        Coffee
      • 4
        Constituent subtraction
        Speaker: Peter Berta (Charles University (CZ))
        Slides
      • 5
        Puppi
        Speaker: Nhan Viet Tran (Fermi National Accelerator Lab. (US))
        Slides
      • 6
        Soft Killer
        Speaker: Gregory Soyez (CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR))
        Slides
    • 1:00 PM
      Lunch 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      19
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    • Software introduction 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      19
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      Conveners: Gavin Salam (CERN) , Gregory Soyez (CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR)) , Matteo Cacciari (LPTHE Jussieu) , Nhan Viet Tran (Fermi National Accelerator Lab. (US)) , Pascal Nef (SLAC National Accelerator Laboratory (US))
      • 7
        Suggested studies and figures of merit
        Speakers: Ariel Gustavo Schwartzman (SLAC National Accelerator Laboratory (US)) , Gavin Salam (CERN) , Gregory Soyez (CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR)) , Matteo Cacciari (LPTHE Paris)
        Slides
    • Work time 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      19
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    • 7:30 PM
      Dinner 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      19
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    • PU suppression techniques 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      19
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      Conveners: Matteo Cacciari (LPTHE Paris) , Mikko Voutilainen (University of Helsinki (FI)) , Nhan Viet Tran (Fermi National Accelerator Lab. (US))
      • 8
        Topoclustering pileup suppression
        Speaker: Peter Loch (University of Arizona (US))
        Slides
      • 9
        JetID at CMS
        Speaker: Philip Coleman Harris (CERN)
        Slides
      • 10
        Heavy ion PU removal methods
        Speakers: Yue Shi Lai (Massachusetts Inst. of Technology (US)) , Yue Shi Lai (Massachusetts Inst. of Technology (US))
        Slides
      • 10:30 AM
        Coffee
      • 11
        Jet reclustering
        Speaker: Maximilian J Swiatlowski (SLAC National Accelerator Laboratory (US))
        Slides
      • 12
        Cleansing
        Speaker: Matthew Schwartz (Harvard University)
        Slides
    • Work time 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      19
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    • 1:00 PM
      Lunch 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      19
      Show room on map
    • Work time 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      19
      Show room on map
      Conveners: Michael Begel (Brookhaven National Laboratory (US)) , Mikko Voutilainen (University of Helsinki (FI))
      • 13
        ATLAS & CMS Pileup Discussion
        Speakers: Michael Begel (Brookhaven National Laboratory (US)) , Mikko Voutilainen (University of Helsinki (FI))
        Slides
    • PU mitigation techniques for missing ET 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      19
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      Convener: Matthew Schwartz (Harvard University)
      • 14
        Missing ET at ATLAS
        Speaker: Peter Loch (University of Arizona (US))
        Slides
      • 15
        Missing ET at CMS
        Speaker: Matthieu Pierre Marionneau (University of Maryland (US))
        Transparents
    • 10:30 AM
      Coffee 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      19
      Show room on map
    • Work time 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      19
      Show room on map
    • 1:00 PM
      Lunch 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      19
      Show room on map
    • Work time 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      19
      Show room on map
    • 3:30 PM
      Coffee 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      19
      Show room on map
    • Working group reports 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      19
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      • 16
        report
        Speakers: Gavin Salam (CERN) , Gregory Soyez (CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR)) , Matteo Cacciari (LPTHE Paris)
        Slides
      • 17
        report
        Speaker: Maximilian J Swiatlowski (SLAC National Accelerator Laboratory (US))
      • 18
        report
        Speakers: Matthew Low (University of Chicago (US)) , Nhan Viet Tran (Fermi National Accelerator Lab. (US)) , Philip Coleman Harris (CERN)
      • 19
        report
        Speaker: Pascal Nef (SLAC National Accelerator Laboratory (US))
        Slides
      • 20
        report
        Speaker: Peter Berta (Charles University (CZ))