LHC Lumi Days 2012

Europe/Zurich
TH Theory Conference Room (CERN)

TH Theory Conference Room

CERN

Benedetto Gorini (CERN), Emilio Meschi (CERN), Helmut Burkhardt (CERN), Massimiliano Ferro-Luzzi (CERN), Michelangelo Mangano (CERN)
Description

Following the successful 2011 meeting, and in view of the progress made in 2011 both in the determination of the LHC luminosity, and in successfully exploiting this increased accuracy in physics analysis, we propose a new edition of LHC lumidays.

A list of useful references and documents of relevance for the workshop can be found here, and the proceedings of the first edition are available from
http://cdsweb.cern.ch/record/1347440

To subscribe to the workshop mailing list, go to

https://simba3.web.cern.ch/simba3/SelfSubscription.aspx

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

Proceedings
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, no pdf files) are to be uploaded directly the indico timetable by 2nd of April at the latest.


Participants
  • Albert De Roeck
  • Alessandro Ratti
  • ALIRADI Rachid
  • Andrej Gorisek
  • Andrzej Zuranski
  • Antonello Di Mauro
  • Boštjan Maček
  • Chandra Bhat
  • Colin Barschel
  • David Berge
  • DAVID Yu
  • Eva Barbara Holzer
  • Federico Alessio
  • federico roncarolo
  • fulvio piccinini
  • Gabriel Anders
  • Giacinto De Cataldo
  • Gianluca Valentino
  • Gilda Scioli
  • Helmut Burkhardt
  • Howard Matis
  • Humberto Maury Cuna
  • Ivan Kralik
  • Jaap Panman
  • Jeremy Werner
  • Jeroen Hegeman
  • Jiri Prochazka
  • John Jowett
  • Jorg Wenninger
  • Juan Rojo
  • Kenneth Osterberg
  • Krzysztof Piotrzkowski
  • Mark Tibbetts
  • Martino Gagliardi
  • Massimiliano FERRO-LUZZI
  • Massimo Placidi
  • Matthieu Heller
  • Michael Albrow
  • Mika Huhtinen
  • NITESH SONI
  • Oyama Ken
  • Patrick PUZO
  • Reyes Alemany Fernandez
  • Samah Abdel Khalek
  • Saman Moradian Jahoudbejari
  • Samir Arfaoui
  • Sophie Cavalier
  • Stefan Maettig
  • Sune Jakobsen
  • Terry Wyatt
  • Thilo Pauly
  • Valeri Khoze
  • Valerie Halyo
  • Versteegen Reine
  • Victor Coco
  • Vladislav Balagura
  • Werner Herr
  • Witold Kozanecki
  • Wednesday, 29 February
    • 09:00 13:00
      Session 1: Theoretical and experimental prospects and challenges TH Theory Conference Room

      TH Theory Conference Room

      CERN

      1) assessment of the impact of the 2011 luminosity determinations on the physics programme: (a) W/Z/top cross sections, (b) total cross sections
      2) status of indirect measurements of luminosity: (a) lum-independent total Xsection, (b) pp->pp lept lept
      3) prospects for 2012: physics-driven requirements for further improvements in the absolute luminosity measurement, experimental and PDF systematics for the precise determination/prediction of cross setion ratios at 8 and 7 tev
      4) status, needs and interest in luminosity determinations for the p Pb and PbPb runs

      • 09:00
        Welcome and introduction 5m
      • 09:05
        Physics potential of precision measurements of the LHC luminosity 25m
        The uncertainty in the determination of the LHC luminosity is rapidly becoming a limiting factor for the analysis and interpretation of many important LHC processes. In this talk first of all we discuss the theoretical accuracy of total cross sections and examine in which cases the luminosity error is or will be dominant. We then review the impact of LHC data in PDF determinations, with enphasis on the effects of the luminosity uncertainty. We explore the requirements for the accuracy of the 2011 luminosity determination from the point of view of standard candle cross section and other important processes. Finally we discuss what we can learn from the accurate measurement of cross section ratios at different center of mass energies for processes like W, ttbar and dijet production.
        Speaker: Juan Rojo Chacon (CERN)
        Slides
        Video in CDS
      • 09:30
        ATLAS 20m
        Speaker: Massimiliano Bellomo (CERN)
        Slides
        Video in CDS
      • 09:50
        ALFA 15m
        Speaker: Karlheinz Hiller (Deutsches Elektronen-Synchrotron (DE))
        proceedings
        Slides
        Video in CDS
      • 10:05
        CMS 30m
        Speaker: Hwi Dong Yoo (Purdue University (US))
        Slides
        Video in CDS
      • 10:35
        Coffee break 20m
      • 10:55
        LHCb 25m
        Speaker: Victor Coco (NIKHEF (NL))
        Slides
        Video in CDS
      • 11:20
        TOTEM 25m
        Speaker: Kenneth Osterberg (University of Helsinki)
        Slides
        Video in CDS
      • 11:45
        A proposal for the absolute lum-measurement at 1% 25m
        Speaker: Mieczyslaw Krasny (Univ. P. et Marie Curie (Paris VI) (FR))
        Slides
        Video in CDS
    • 13:45 18:05
      Session 2a: Luminosity Calibration Results TH Theory Conference Room

      TH Theory Conference Room

      CERN

      Session 2 is organized in two topics:
      1) Progress on the Bunch Current Normalization (BCNWG)
      2) Direct luminosity calibration results of each LHC experiment

      For the second part (luminosity calibration results), each experiment is asked to address the following topics:
      Cover p-p (2.36 & 7 TeV) & Pb-Pb, all scan series since Nov 2010.
      - if not final, present status of analysis
      Address all systematics (except from bunch current) or observations:
      - reproducibility, hysteresis, XY coupling, beam-beam effects, ...
      - pile-up, extrapolation to physics pile-up, ...
      - length scale, VDM curve fit procedure, ...
      General prospects and improvements for 2012
      Expected (estimated) systematic uncertainties for the luminosity calibration ratio of 8TeV vs 7TeV center-of-mass energies.
      En passant, express wishes/ideas/opinions for 2012.
      Also: how precise a measurement is expected if a VDM scan is made in early 2012 in normal physics optics ? (the bunch charge, emittance and spacing are probably negotiable)

      Convener: Massimiliano Ferro-Luzzi (CERN)
      • 13:45
        Overview and relative bunch population measurements 35m
        Speaker: Massimiliano Ferro-Luzzi (CERN)
        Paper
        Slides
        Video in CDS
      • 14:25
        Using the BPTX for relative bunch population measurements 10m
        Speaker: Gabriel Anders (Ruprecht-Karls-Universitaet Heidelberg (DE))
        Slides
        Video in CDS
      • 14:40
        Relative bunch population and ghost charge measurements from LHCb beam-gas rates 20m
        Speaker: Jaap Panman (CERN)
        Slides
        Video in CDS
      • 15:05
        Ghost and satellites measured with the LHC LDM 20m
        Speaker: Adam Jeff
        Paper
        Slides
        Video in CDS
      • 15:30
        Coffee/tea break 20m
      • 15:55
        Ghost and satellites measured with ALICE 20m
        Speaker: Martino Gagliardi (Universita e INFN (IT))
        Paper
        Slides
        Video in CDS
      • 16:20
        Results of the LHC DCCT Calibration Studies 30m
        Speaker: Colin Barschel (Rheinisch-Westfaelische Tech. Hoch. (DE))
        Paper
        Slides
        Video in CDS
      • 16:55
        LHCb luminosity calibration results 30m
        Speaker: Vladislav Balagura (ITEP Institute for Theoretical and Experimental Physics (RU))
        Slides
        Video in CDS
      • 17:30
        ALICE luminosity calibration results 30m
        Speakers: Ken Oyama (Ruprecht-Karls-Universitaet Heidelberg (DE)), Martino Gagliardi (Universita e INFN (IT))
        Paper
        Slides
        Video in CDS
  • Thursday, 1 March
    • 09:00 10:15
      Session 2b: Luminosity Calibration Results TH Theory Conference Room

      TH Theory Conference Room

      CERN

      Convener: Massimiliano Ferro-Luzzi (CERN)
      • 09:00
        CMS luminosity calibration results 30m
        Speaker: Dr Jeroen Hegeman (Princeton University (US))
        Slides
        Video in CDS
      • 09:35
        ATLAS luminosity calibration results 30m
        Speaker: Mark James Tibbetts (Lawrence Berkeley National Lab. (US))
        Paper
        Slides
        Video in CDS
    • 10:15 10:35
      Coffee/tea break 20m TH Theory Conference Room

      TH Theory Conference Room

      CERN

    • 10:35 12:05
      Session 3a TH Theory Conference Room

      TH Theory Conference Room

      CERN

      Convener: Dr Helmut Burkhardt (CERN)
      • 10:35
        Beam Instrumentation of Relevance for Luminosity Determination - Status and Prospects 20m
        including : longitudinal monitor, emittance, BPMs
        Speaker: Mr Jean-Jacques Gras (CERN)
        Dynamic Graph
        Slides
        Video in CDS
      • 11:00
        BRAN: Modeling and experimental results at ATLAS and CMS 10m
        Speaker: Alessandro Ratti (Lawrence Berkeley National Lab. (US))
        Slides
        Video in CDS
      • 11:15
        Operational aspects 20m
        luminosity scans, special runs, high-beta
        Speaker: Alick Macpherson (CERN)
        Slides
        Video in CDS
      • 11:40
        Energy Calibration 20m
        knowledge, extrapolation of energy, remarks and lessons learned on special operation
        Speaker: Dr Jorg Wenninger (CERN)
        Paper
        Slides
        Video in CDS
    • 12:05 13:40
      Lunch Break 1h 35m
    • 13:40 15:40
      Session 3b TH Theory Conference Room

      TH Theory Conference Room

      CERN

      Convener: Dr Helmut Burkhardt (CERN)
      • 13:40
        Beam-beam and dynamic beta 20m
        Beam-beam effects relevant for VdM scans
        Speaker: Werner Herr (CERN)
        Paper
        Slides
        Video in CDS
      • 14:05
        Beta measurements 20m
        global beta, beta*, amount and location of quadrupole errors, modeling
        Speaker: Glenn Vanbavinckhove (NIKHEF (NL))
        Slides
        Video in CDS
      • 14:30
        Systematic uncertainties 20m
        magnets, orbit, alignment, beam-beam
        Speaker: Sophie Cavalier (Universite de Paris-Sud 11 (FR))
        Slides
        Video in CDS
      • 14:55
        Closest approach of roman pots to the beam 20m
        Speaker: Dr Stefano Redaelli (CERN)
        Slides
        Video in CDS
      • 15:20
        High-beta optics plans 20m
        For 2012 and studies needed for LSS1
        Speaker: Dr Helmut Burkhardt (CERN)
        Slides
    • 15:45 16:10
      Coffee/tea break 25m TH Theory Conference Room

      TH Theory Conference Room

      CERN

    • 16:10 17:40
      Summary session TH Theory Conference Room

      TH Theory Conference Room

      CERN

      • 16:10
        Summary of impressions/wishes/ideas from the experiments / Discussion 40m
        Speaker: Witold Kozanecki (CEA - Centre d'Etudes de Saclay (FR))
        Slides
        Video in CDS
      • 16:55
        Short summary and comments on the machine session 15m
        Speaker: Mike Lamont (CERN)
        Slides
        Video in CDS