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LumiDays 25

10–12 Mar 2025
CERN
Europe/Zurich timezone
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Contribution List

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  1. 1. Welcome – workshop program, goals and scope
    David Stickland (Princeton University (US))
    10/03/2025, 14:00
  2. 2. Overview of ATLAS luminosity determination
    Brian Andrew Cole (Columbia University (US))
    10/03/2025, 14:10

    Overview of ATLAS luminosity-determination methodology in
    Run III, and comparison to Run-II methodology (both pp and HI)
    Introduction to common vdM [avoid duplication in next talk!]
    • Global view of:
    - calibration strategy: vdM, LSC, calibration-transfer / non-
    linearity corrections, instrumental corrections, ...
    - long-term monitoring strategy, conceptual definition of CT +
    LTS...

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  3. 3. Overview of CMS luminosity determination
    Gabriella Pasztor (Eötvös University, Budapest)
    10/03/2025, 14:50

    Overview of CMS luminosity-determination methodology in
    Run III, and comparison to Run-II methodology (both pp and HI)

    • Global view of
    - calibration strategy: vdM, LSC, calibration-transfer / non-
    linearity corrections, instrumental corrections, ...
    - long-term monitoring strategy, conceptual definition of CT +
    LTS systematic uncertainties
    • Description of calibration procedures (vdM...

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  4. 4. HI-specific vdM-calibration issues (ALICE Speaker)
    Martino Gagliardi (Universita e INFN Torino (IT))
    10/03/2025, 16:00

    For instance: fitting procedures with challenging scan shapes;
    dealing with low-statistics in scan tails; BCID-dependent satellite
    corrections; satellite collisions; NF corrections; use of ZDC as
    high-statistics L monitor
    Include HI-specific contributions from All experiments

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  5. 5. ALICE final Run-II luminosity measurements
    Prof. Jesus Guillermo Contreras Nuno (Czech Technical University in Prague (CZ))
    10/03/2025, 16:35
  6. 6. LHCb methods & techniques for luminosity measurements in pp collisions
    Daniele Passaro (SNS & INFN Pisa (IT))
    10/03/2025, 17:00

    • Reminder of what was used in Run II, and main results
    • brief intro to the new LHCb luminometers in Run III
    • possibly some preliminary results for LHCb Run-III luminosity

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  7. 7. Overview of the accelerator issues that impact the absolute luminosity calibrations at the LHC
    Witold Kozanecki (University of Oregon (US))
    11/03/2025, 09:00
  8. 8. Sources & mitigation of non-factorization in the injectors & the LHC
    Foteini Asvesta (CERN)
    11/03/2025, 09:40

    • mechanisms of generating non-factorization in the proton-density
    distributions, and its transport through the injector chain
    • optimized beam preparation for vdM beams — how to optimize
    factorization already before the vdM fill (e.g. scraping
    measurements in LHC at injection to confirm factorization, further
    optimization of beam production schemes in the injectors
    • collimation in the LHC?

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  9. 9. Results of the 2024 Non-factorization MD: accelerator measurements
    Elleanor Lamb
    11/03/2025, 10:10
  10. 10. LHCb non-factorization analyses
    Vladislav Balagura (Centre National de la Recherche Scientifique (FR))
    11/03/2025, 11:00

    • 2-D vdM analysis
    • LHCb BGI results from the NF MD

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  11. 11. CMS non-factorization analyses
    Peter Major (University of Maryland (US))
    11/03/2025, 11:30

    2-D vdM, beam-beam imaging and LRE analyses
    • Including CMS results from the NF MD?

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  12. 12. ATLAS non-factorization analyses
    Tim Barklow (SLAC National Accelerator Laboratory (US))
    11/03/2025, 12:00

    2-D vdM and LRE analyses
    • Including ATLAS results from the NF MD?
    • Include some ALICE LRE results if so requested

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  13. 30. Summary of beam-beam simulation studies during LS2
    Witold Kozanecki (University of Oregon (US))
    11/03/2025, 14:00

    Summary of the beam-beam papers, with the emphasis on
    (i) bb-related vdM uncertainties as currently understood, and
    (ii) pending issues

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  14. 31. Recent developments in beam-beam studies
    Joanna Wanczyk
    11/03/2025, 14:35

    For instance:
    • Results of the 2022 beam-beam MD
    • New simulation results on Lu/L0 ambiguity
    • Interplay between beam-beam & non-factorization biases

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  15. 32. Generalization of parameterized beam-beam corrections to 2-D vdM scans
    Ivan Kralik (Slovak Academy of Sciences (SK))
    11/03/2025, 15:05
  16. 13. Tune measurements in vdM fills, before and during collisions
    Tom Levens (CERN)
    11/03/2025, 16:00
  17. 14. LHC bunch-population measurements in Run III & beyond: a status report
    Alexander Nicholas Jury (University of Liverpool (GB))
    11/03/2025, 16:20

    • DCCT, FBCT, BSRL: performance, issues, new developments.
    • also: BPTX @ IP1 & IP5, w/ applicable functionalities; BQM
    • also: 1-2 slides on planned HL-LHC upgrades of the beam
    instrumentation relevant to bunch-current measurements?

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  18. 15. LHCb ghost-charge measurements
    Niall Thomas Mchugh (University of Glasgow (GB))
    11/03/2025, 16:50

    • Run-III results and performance to date
    • brief mention of plans for further improvements

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  19. 36. Numerical Tools for Studying Beam Dynamics Effects on Luminosity Calibration: COMBI and XSUITE
    Dr Tatiana Pieloni (EPFL)
    11/03/2025, 17:10
    • XSUITE: Overview and Recent Luminosity Developments
    • Benchmarking Luminosity Calculations: COMBI vs. XSUITE (private version)
    • First Studies on Linear Coupling (Local and Global) as an Example Case
    • Potential Uses of XSUITE in Future Studies and Plans (e.g., adding the entire LHC lattice, including errors, long-range beam-beam interactions, etc.)
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  20. 16. Follow-up questions and discussion
    Witold Kozanecki (University of Oregon (US))
    11/03/2025, 17:30
  21. 17. Impact of magnetic non-linearities, BPM performance & x-y coupling on ATLAS length-scale calibrations
    Richard Hawkings (CERN)
    12/03/2025, 09:00

    • including the systematic. uncertainties associated w/ DOROS-
    BPM performance limitations, e.g. non-reproducibility of the
    BPM length scale, their response to beam-beam deflections and
    their apparent out-of-plane coupling

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  22. 18. Status report on LHC beam-position measurements at the experimental IPs
    Dr Marek Gasior (CERN)
    12/03/2025, 09:35

    • DOROS BPMs: improvements since the start of Run III,
    performance, known limitations & issues
    • Brief comments about Arc BPMS in the context of orbit-drift
    monitoring?

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  23. 19. BPM- and BGI-based beam-displacement measurements at IP8
    Vladislav Balagura (Centre National de la Recherche Scientifique (FR))
    12/03/2025, 10:00
  24. 34. Emittance evolution in physics and luminosity-calibration fills: what measurements do we have and what did we learn from them?
    Sofia Kostoglou (CERN)
    12/03/2025, 11:00
  25. 35. Uses of Emittance Scans and Planning for 25-26
    David Stickland (Princeton University (US))
    12/03/2025, 11:30
    • How are LHC experiments and LHC Operations using Emittance scans today
    • Is there a preference for early or late scans
    • How frequently should they be run
    • List improvements that either have been implemented in the analysis since Run II , or are definitely needed (e.g.: BB corrections, all expts), or are being dreamt about (e.g. characterization of long-range BB effects in the scans with trains)
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  26. 22. Long term stability, non-linearity corrections, integration methodologies and systematic uncertainties in CMS
    Francesco Romeo (Vanderbilt University)
    12/03/2025, 11:50
  27. 23. Calibration-transfer and long-term stability in ATLAS: corrections & systematic uncertainties.
    Giulia Ripellino (Uppsala University (SE))
    12/03/2025, 14:00

    Examples of corrections that could be mentioned:
    • LUCID HV adjustments based on Bi calibrations
    • LUCID non-linearity correction using track-counting-based L
    Examples of systematics that could be discussed:
    • CT uncertainty (from TILE/tracks)
    • Anchoring uncertainty
    • Long-term stability & consistency uncertainty

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  28. 24. Use of reference physics processes for long-term relative-stability monitoring
    David Walter (Massachusetts Inst. of Technology (US))
    12/03/2025, 14:30

    For instance:
    • in pp: Z-, but also J/psi- & Upsilon- counting
    • in PbPb: UPC dimuons (CMS)
    • in PbPb: photonuclear signatures in the ZDCs

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  29. 25. New LHCb luminometers in Run III
    Edoardo Franzoso (Universita e INFN, Ferrara (IT))
    12/03/2025, 15:05

    what has LHCB learnt from PLUME (and other luminometers) in
    Run III, and how it informs the LHCb strategy for Run 4

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  30. 27. Looking to Run 4: ATLAS Run-3 experience with LUCID prototypes for HL- LHC
    Vincent Hedberg (Lund University (SE))
    12/03/2025, 16:00
  31. 28. Looking to Run 4 in CMS
    Alexey Shevelev (University of Maryland (US))
    12/03/2025, 16:30

    For instance (under consideration; not an exhaustive list):
    • experience with BCM1F in Run 3, and how it informs the CMS
    strategy for Run 4
    • proposal for very-high µ (µ > 120) fill with a mixture of indivs &
    trains (as done in 2016) for characterizing the BCID-dependent
    response, and the relative µ-dependence, of the CMS
    luminometers (also of interest to ATLAS)
    • scouting
    •...

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  32. 29. Discussion and Closeout
    12/03/2025, 17:00
  33. 33. Emittance evolution in physics and luminosity-calibration fills: what measurements do we have and what did we learn from them?
    Sofia Kostoglou (CERN)
  34. 26. First experience with the ALICE FIT system as an online luminometer
  35. 21. What have the Experiments learnt from emittance scans, and what can we do better?
    David Stickland (Princeton University (US))