LHC Lumi Days

503-1-001 - Council Chamber (CERN)

503-1-001 - Council Chamber


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Helmut Burkhardt (CERN) , Massimiliano Ferro-Luzzi (CERN) , Michelangelo Mangano (CERN)

The aim of this workshop will be to review the results of the first luminosity calibration measurements at the LHC and to stimulate a discussion on future measurements. A total accuracy of around 5% seems achievable with the current instrumentation, on relatively short term. The need for and the challenges associated with a more precise determination will be debated. The importance of knowing the cross section scale to a given precision will be reviewed. Direct luminosity calibration methods will be compared to indirect methods, including recent experience at other  cyclical colliders. Physics motivations, systematic uncertainties, proposals for optimal running conditions for future luminosity calibration experiments, etc., will be openly discussed.

A list of useful references and documents of relevance for the workshop can be found here

To subscribe to the workshop mailing list, go to


and request to join the mailing list lhc-lumi-days@cern.ch

Information on accommodation, access to CERN and laptop registration is available from http://lpcc.web.cern.ch/LPCC/index.php?page=visit

Scientific Secretary: Alick Macpherson

Notes for Contributions
A Proceedings will be produced and so all speakers are asked to provide a writeup of their talk. As such, we ask all speakers to take note of the following constraints

  • Speakers should write-up their contributions (1 paper per talk, no page limit but recommended length approx. 5 pages) by using the JACoW templates.
  • All papers (format ps and word or LATeX with images,  plus a pdf file of the paper) are to be uploaded directly inthe indico timetable by 1st of March at the latest.

  • The final proceedings will be made available via the web but possible also as a printed report in black and white. Therefore it is recommended to avoid color codes!


  • Adam Paul Hunt
  • Albert De Roeck
  • Alessandro Ratti
  • Alick Macpherson
  • Allen Caldwell
  • Andreas Morsch
  • Andrej Gorisek
  • Andrius Juodagalvis
  • Andrzej Zuranski
  • Antonello Di Mauro
  • Antonio Zoccoli
  • Arfaoui Samir
  • Bolek Pietrzyk
  • Bostjan Macek
  • Carolina Gabaldon Ruiz
  • Colin Barschel
  • Daniel Marlow
  • Daniela Macina
  • David Berge
  • David d'Enterria
  • David Peter Stickland
  • Eric Feng
  • Eric Torrence
  • Fabiola Gianotti
  • Federico Alessio
  • Fulvio Piccinini
  • Gabriel Anders
  • Giacinto De Cataldo
  • Hans Dijkstra
  • Heinemann Beate
  • Helmut Burkhardt
  • Jaap Panman
  • James Pinfold
  • Jamie Boyd
  • Jean-Jacques GRAS
  • Jeremy Werner
  • John Jowett
  • Jonathan Anderson
  • Jorg Wenninger
  • Krzysztof Piotrzkowski
  • Lyn Evans
  • Marco Zanetti
  • Maria Chamizo Llatas
  • Marjorie Shapiro
  • Mark James Tibbetts
  • Martin Aleksa
  • Martino Gagliardi
  • Massimiliano Ferro-Luzzi
  • Massimo Giovannozzi
  • Massimo Placidi
  • Matthieu Heller
  • Michael Albrow
  • Michael Dittmar
  • Michael Ludwig
  • Michelangelo Mangano
  • Mieczyslaw Witold Krasny
  • Mika Huhtinen
  • Mike Lamont
  • Nitesh Soni
  • Onel Yasar
  • Paolo Gandini
  • Paolo Martinengo
  • Patrick Michel Puzo
  • Paul Collier
  • Paul Kuijer
  • Pauline Bernat
  • Per Grafstrom
  • Peter Kvasnicka
  • Plamen Hristov Hopchev
  • Rainer Bartoldus
  • Resham Sarkar
  • Rhodri Jones
  • Richard Jacobsson
  • Rossano Giachino
  • Ryoichi Miyamoto
  • Samvel Khalatyan
  • Siegfried Wenig
  • Simon Mathieu White
  • Sophie Cavalier
  • Stefan Maettig
  • Stefano Redaelli
  • Stephen Schnetzer
  • Thilo Pauly
  • Tiziano Camporesi
  • Vaia Papadimitriou
  • Valeri Khoze
  • Valerie Halyo
  • Vincent Hedberg
  • Vladislav Balagura
  • Werner Herr
  • Witold Kozanecki
  • Yngve Inntjore Levinsen
  • Thursday, 13 January 2011
    • 09:00 12:55
      Physics aspects
      • What precision should the experiments aim at?
      • What is the benefit for physics?
      • Relevance of lum measurements at different energies
      • Comparison between the reach of direct and indirect lum determinations
      Convener: Michelangelo Mangano (CERN)
      • 09:00
        Welcome and introduction 5m
        Speaker: Massimiliano Ferro-Luzzi (CERN)
      • 09:05
        Motivations and precision targets for luminosity 20m
        Speaker: Michelangelo Mangano (CERN)
      • 09:30
        Indirect luminosity measurements: theoretical assessment 30m
        Speaker: Valery Khoze (Science Laboratories)
      • 10:05
        TOTEM: prospects for total cross section measurements 20m
        Speaker: Dr. MARIO DEILE (CERN, PH-TOT)
      • 10:30
        LHCb: indirect luminosity measurement 20m
        Speaker: Jonathan Anderson (Universitaet Zuerich)
      • 10:55
        Coffee break 15m
      • 11:10
        Status and prospects of ALFA 15m
        Speaker: Karlheinz Hiller (Deutsches Elektronen Synchrotron (DESY)-Unknown-Unknown)
      • 11:30
        ATLAS: W and Z boson cross sections and prospects for other precision cross section measurements 20m
        Speaker: Matthias Schott (CERN)
      • 11:55
        CMS: W and Z boson cross sections and prospects for other precision cross section measurements 20m
        Speakers: Jeremy Werner (Princeton University) , Jeremy Werner (Princeton University)
      • 12:20
        CMS forward detectors for indirect luminosity measurements 15m
        Speakers: Stephen Schnetzer (CERN) , Steve Schnetzer (Rutgers University)
    • 13:00 14:00
      Lunch Break
    • 14:00 18:30
      First results of direct luminosity calibration and future prospects
      • review results of 2009-2010 luminosity calibration experiments
      • comparison to machine parameters (b*, emittances, ...)
      • ATLAS/CMS cross comparison
      • review systematic uncertainties: current list and future prospects
      • propose optimal conditions for future luminosity calibration experiments
      • requirements for a possible intermediate b* run in 2011?
      Convener: Massimiliano Ferro-Luzzi (CERN)
      • 14:00
        BCTs and BPTX analysis results 15m
        Speaker: Thilo Pauly (CERN)
      • 14:20
        ALICE 2010 luminosity determination 30m
        Speaker: Dr. Ken Oyama (University of Heidelberg)
      • 15:00
        LHCb 2010 luminosity determination 30m
        Speaker: Vladislav Balagura (ITEP Institute for Theoretical and Experimental Physics (ITEP)-U)
      • 15:40
        LHCb beam-gas imaging results 15m
        Speaker: Plamen Hristov Hopchev (LAPP-Laboratoire d'Annecy-le-Vieux de Physique des Particules (L)
      • 16:00
        Coffee/tea break 20m
      • 16:20
        CMS 2010 luminosity determination 30m
        Speaker: Marco Zanetti (MIT)
      • 17:00
        ATLAS 2010 luminosity determination 30m
        Speaker: Mika Huhtinen (CERN)
      • 17:40
        ATLAS/CMS comparison 15m
        Speaker: Dr. Beate Heinemann (LBNL and UC Berkeley)
  • Friday, 14 January 2011
    • 09:00 12:30
      Instrumentation and machine aspects related to luminosity calibration
      • overview/expectations of machine/beam properties
      • review state-of-the art and/or novel technologies for beam current normalisation (for LHC-like beams), including experience from other hadron colliders
      • review methods/possibilites to determine the beam current fraction that does not contribute to luminosity (for LHC-like beams)
      • review intermediate b* options for 2011
      Convener: Dr. Helmut Burkhardt (CERN)
      • 09:00
        Luminosity determination at the TEVATRON 25m

        Covering the instrumentation and machine aspects related to luminosity calibration
        20' + 5' discussion

        Speaker: Vaia Papadimitriou
      • 09:25
        Experience at CERN with luminosity monitoring and calibration, SpbparS, LEP... 25m

        20' + 5' discussion

        Speaker: Rüdiger Schmidt
      • 09:50
        Instrumentation1 : Beam current transformer 25m

        20' + 5' discussion

        Speaker: Jean-Jacques Gras
      • 10:15
        Coffee Break 20m
      • 10:35
        Instrumentation2: Other instruments, ghost/satellite bunch monitoring, halo, emittance, new developments ... 25m

        20' + 5' discussion

        Speaker: Mr. Enrico Bravin (CERN AB-BI)
      • 11:00
        IP positions and angles, knowledge and correction 25m

        20' + 5' discussion

        Speaker: Jörg Wenninger
      • 11:25
        High-beta optics 25m

        Strategy to commission the intermediate 90m optics, running scenario, required knowledge of beam-parameters
        20' + 5' discussion

        Speaker: Helmut Burkhardt
      • 11:50
        Luminosity scans at LHC 25m

        Including machine view on how to perform scans, minimize systematics and future prospects, also covering shortly RHIC
        20' + 5' discussion

        Speaker: Simon White
    • 12:30 14:00
      Lunch break
    • 14:00 17:00
      Summary and Discussion

      Discussion of the next steps forward, goals, needed resources.

      • 14:00
        Status summary and wishes from the experiments / Discussion 30m
        Speaker: Jaap Panman (CERN)
      • 14:40
        Summary as viewed from the machine / Discussion 30m
        Speaker: Paul Collier (CERN)