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LHC Lumi Days 2012

chaired by Helmut Burkhardt (CERN), Massimiliano Ferro-Luzzi (CERN), Michelangelo Mangano (CERN), Benedetto Gorini (CERN), Emilio Meschi (CERN)
from to (Europe/Zurich)
at CERN ( 4-3-006 - TH Theory Conference Room )
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.
Go to day
  • Wednesday, 29 February 2012
    • 09:00 - 13:00 Session 1: Theoretical and experimental prospects and challenges 
      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 5'
      • 09:05 Physics potential of precision measurements of the LHC luminosity 25' 
        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)
        Material: Slides pdf file Video in CDS link
      • 09:30 ATLAS 20'
        Speaker: Massimiliano Bellomo (CERN)
        Material: Slides pdf file Video in CDS link
      • 09:50 ALFA 15'
        Speaker: Karlheinz Hiller (Deutsches Elektronen-Synchrotron (DE))
        Material: Slides powerpoint file pdf file Video in CDS link proceedings word file pdf file
      • 10:05 CMS 30'
        Speaker: Hwi Dong Yoo (Purdue University (US))
        Material: Slides pdf file Video in CDS link
      • 10:35 Coffee break 20'
      • 10:55 LHCb 25'
        Speaker: Victor Coco (NIKHEF (NL))
        Material: Slides pdf file Video in CDS link
      • 11:20 TOTEM 25'
        Speaker: Kenneth Osterberg (University of Helsinki)
        Material: Slides pdf file Video in CDS link
      • 11:45 A proposal for the absolute lum-measurement at 1% 25'
        Speaker: Mieczyslaw Krasny (Univ. P. et Marie Curie (Paris VI) (FR))
        Material: Slides pdf file Video in CDS link
    • 13:45 - 18:05 Session 2a: Luminosity Calibration Results 
      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 35'
        Speaker: Massimiliano Ferro-Luzzi (CERN)
        Material: Paper unknown type file Slides powerpoint file pdf file Video in CDS link
      • 14:25 Using the BPTX for relative bunch population measurements 10'
        Speaker: Gabriel Anders (Ruprecht-Karls-Universitaet Heidelberg (DE))
        Material: Slides pdf file Video in CDS link
      • 14:40 Relative bunch population and ghost charge measurements from LHCb beam-gas rates 20'
        Speaker: Jaap Panman (CERN)
        Material: Slides pdf file Video in CDS link
      • 15:05 Ghost and satellites measured with the LHC LDM 20'
        Speaker: Adam Jeff
        Material: Paper word file Slides powerpoint file pdf file Video in CDS link
      • 15:30 Coffee/tea break 20'
      • 15:55 Ghost and satellites measured with ALICE 20'
        Speaker: Martino Gagliardi (Universita e INFN (IT))
        Material: Paper pdf file Slides pdf file Video in CDS link
      • 16:20 Results of the LHC DCCT Calibration Studies 30'
        Speaker: Colin Barschel (Rheinisch-Westfaelische Tech. Hoch. (DE))
        Material: Paper unknown type file pdf file Slides pdf file Video in CDS link
      • 16:55 LHCb luminosity calibration results 30'
        Speaker: Vladislav Balagura (ITEP Institute for Theoretical and Experimental Physics (RU))
        Material: Slides pdf file Video in CDS link
      • 17:30 ALICE luminosity calibration results 30'
        Speakers: Ken Oyama (Ruprecht-Karls-Universitaet Heidelberg (DE)), Martino Gagliardi (Universita e INFN (IT))
        Material: Paper unknown type filedown arrow pdf filedown arrow Slides powerpoint file pdf file Video in CDS link
  • Thursday, 1 March 2012
    • 09:00 - 10:15 Session 2b: Luminosity Calibration Results
      Convener: Massimiliano Ferro-Luzzi (CERN)
      • 09:00 CMS luminosity calibration results 30'
        Speaker: Dr. Jeroen Hegeman (Princeton University (US))
        Material: Slides pdf file Video in CDS link
      • 09:35 ATLAS luminosity calibration results 30'
        Speaker: Mark James Tibbetts (Lawrence Berkeley National Lab. (US))
        Material: Paper unknown type file Slides pdf file Video in CDS link
    • 10:15 - 10:35 Coffee/tea break
    • 10:35 - 12:05 Session 3a
      Convener: Dr. Helmut Burkhardt (CERN)
      • 10:35 Beam Instrumentation of Relevance for Luminosity Determination - Status and Prospects 20' 
        including : longitudinal monitor, emittance, BPMs
        Speaker: Mr. Jean-Jacques Gras (CERN)
        Material: Dynamic Graph unknown type file Slides unknown type file Video in CDS link
      • 11:00 BRAN: Modeling and experimental results at ATLAS and CMS 10'
        Speaker: Alessandro Ratti (Lawrence Berkeley National Lab. (US))
        Material: Slides powerpoint file pdf file Video in CDS link
      • 11:15 Operational aspects 20' 
        luminosity scans, special runs, high-beta
        Speaker: Alick Macpherson (CERN)
        Material: Slides pdf file Video in CDS link
      • 11:40 Energy Calibration 20' 
        knowledge, extrapolation of energy, remarks and lessons learned on special operation
        Speaker: Dr. Jorg Wenninger (CERN)
        Material: Paper unknown type file Slides powerpoint file pdf file Video in CDS link
    • 12:05 - 13:40 Lunch Break ( )
    • 13:40 - 15:40 Session 3b
      Convener: Dr. Helmut Burkhardt (CERN)
      • 13:40 Beam-beam and dynamic beta 20' 
        Beam-beam effects relevant for VdM scans
        Speaker: Werner Herr (CERN)
        Material: Paper unknown type file Slides pdf file Video in CDS link
      • 14:05 Beta measurements 20' 
        global beta, beta*,  amount and location of  quadrupole errors, modeling
        Speaker: Glenn Vanbavinckhove (NIKHEF (NL))
        Material: Slides pdf file Video in CDS link
      • 14:30 Systematic uncertainties 20' 
        magnets, orbit, alignment, beam-beam
        Speaker: Sophie Cavalier (Universite de Paris-Sud 11 (FR))
        Material: Slides pdf filedown arrow Video in CDS link
      • 14:55 Closest approach of roman pots to the beam 20'
        Speaker: Dr. Stefano Redaelli (CERN)
        Material: Slides pdf file Video in CDS link
      • 15:20 High-beta optics plans 20' 
        For 2012  and studies needed for LSS1
        Speaker: Dr. Helmut Burkhardt (CERN)
        Material: Slides pdf file
    • 15:45 - 16:10 Coffee/tea break
    • 16:10 - 17:40 Summary session
      • 16:10 Summary of impressions/wishes/ideas from the experiments / Discussion 40'
        Speaker: Witold Kozanecki (CEA - Centre d'Etudes de Saclay (FR))
        Material: Slides powerpoint file pdf file Video in CDS link
      • 16:55 Short summary and comments on the machine session 15'
        Speaker: Mike Lamont (CERN)
        Material: Slides powerpoint file pdf file Video in CDS link