Mitigation of pileup effects at the LHC

Name: Mitigation of pileup effects at the LHC
Start: 2014-05-16T08:00:00+02:00
End: 2014-05-18T18:30:00+02:00
Location: CERN

16 May 2014, 08:00 → 18 May 2014, 18:30 Europe/Zurich

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

4/3-006 - TH Conference Room

CERN

110

Show room on map

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

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

Friday, 16 May
- New PU removal techniques 60/6-015 - Room Georges Charpak (Room F)
  
  60/6-015 - Room Georges Charpak (Room F)
  
  CERN
  
  90
  Show room on map
  
  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
    
    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
- 13:00
  
  Lunch 4/3-006 - TH Conference Room
  
  4/3-006 - TH Conference Room
  
  CERN
  
  110
  Show room on map
- Software introduction 4/3-006 - TH Conference Room
  
  4/3-006 - TH Conference Room
  
  CERN
  
  110
  Show room on map
  
  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
  
  110
  Show room on map
- 19:30
  
  Dinner 4/3-006 - TH Conference Room
  
  4/3-006 - TH Conference Room
  
  CERN
  
  110
  Show room on map
Saturday, 17 May
- PU suppression techniques 4/3-006 - TH Conference Room
  
  4/3-006 - TH Conference Room
  
  CERN
  
  110
  Show room on map
  
  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
    
    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
  
  110
  Show room on map
- 13:00
  
  Lunch 4/3-006 - TH Conference Room
  
  4/3-006 - TH Conference Room
  
  CERN
  
  110
  Show room on map
- Work time 4/3-006 - TH Conference Room
  
  4/3-006 - TH Conference Room
  
  CERN
  
  110
  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
Sunday, 18 May
- PU mitigation techniques for missing ET 4/3-006 - TH Conference Room
  
  4/3-006 - TH Conference Room
  
  CERN
  
  110
  Show room on map
  
  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
  
  Coffee 4/3-006 - TH Conference Room
  
  4/3-006 - TH Conference Room
  
  CERN
  
  110
  Show room on map
- Work time 4/3-006 - TH Conference Room
  
  4/3-006 - TH Conference Room
  
  CERN
  
  110
  Show room on map
- 13:00
  
  Lunch 4/3-006 - TH Conference Room
  
  4/3-006 - TH Conference Room
  
  CERN
  
  110
  Show room on map
- Work time 4/3-006 - TH Conference Room
  
  4/3-006 - TH Conference Room
  
  CERN
  
  110
  Show room on map
- 15:30
  
  Coffee 4/3-006 - TH Conference Room
  
  4/3-006 - TH Conference Room
  
  CERN
  
  110
  Show room on map
- Working group reports 4/3-006 - TH Conference Room
  
  4/3-006 - TH Conference Room
  
  CERN
  
  110
  Show room on map
  - 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))
    
    Slides
    
    Workhop21_100.pdf
    
    Workhop21.pdf
    
    Workhop32_100.pdf
    
    Workhop32.pdf
  - 18
    report
    
    Speakers: Matthew Low (University of Chicago (US)), Nhan Viet Tran (Fermi National Accelerator Lab. (US)), Philip Coleman Harris (CERN)
    
    Slides
    
    mitigation_mass.pdf
    
    mitigation_pt.pdf
    
    puppi_results.pdf
  - 19
    
    report
    
    Speaker: Pascal Nef (SLAC National Accelerator Laboratory (US))
    
    Slides
  - 20
    
    report
    
    Speaker: Peter Berta (Charles University (CZ))

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Mitigation of pileup effects at the LHC

4/3-006 - TH Conference Room

CERN

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

CERN

4/3-006 - TH Conference Room

CERN

4/3-006 - TH Conference Room

CERN

4/3-006 - TH Conference Room

CERN

4/3-006 - TH Conference Room

CERN

4/3-006 - TH Conference Room

CERN

4/3-006 - TH Conference Room

CERN

4/3-006 - TH Conference Room

CERN

4/3-006 - TH Conference Room

CERN

4/3-006 - TH Conference Room

CERN

4/3-006 - TH Conference Room

CERN

4/3-006 - TH Conference Room

CERN

4/3-006 - TH Conference Room

CERN

4/3-006 - TH Conference Room

CERN

4/3-006 - TH Conference Room

CERN

4/3-006 - TH Conference Room

CERN

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