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Summary of the Workshop on Multi-Parton Interactions (MPI@LHC 2012)

H. Abramowicz, P. Bartalini, M. Baehr, N. Cartiglia, R. Ciesielski, E. Dobson, F. Ferro, K. Goulianos, B. Guiot, X. Janssen, H. Jung, Iu. Karpenko, J. Kaspar, J. Katzy, F. Krauss, P. Laycock, E. Levin, M. Mangano, Ch. Mesropian, A. Moraes, M. Myska, D. Moran, R. Muresan, Z. Nagy, T. Pierog, A. Pilkington, M. Poghosyan, T. Rogers, S. Sen, M. H. Seymour, A. Siodmok, M. Strikman, P. Skands, D. Treleani, D. Volyanskyy, K. Werner, P. Wijeratne

TL;DR

The paper documents MPI@LHC 2012, synthesizing experimental results, theory, and MC developments across four working groups focused on MPI, diffraction, small-x, DPS, and MC modeling. It highlights tensions between LHC data and standard MC tunes in diffraction and UE observables, and discusses the DPS formalism as both a background to new physics and a probe of multi-parton correlations via $ ext{σ}_{ ext{eff}}$ and double parton distributions. Theoretical discussions address the nature of DPS, potential 3→4 contributions from perturbative splitting, and the interplay with small-x dynamics, while MC developments showcase advances in EPOS3, color reconnections, and energy-sharing schemes. The report advocates targeted, differential DPS measurements, forward-proton studies, and MC refinements to constrain multi-parton dynamics and improve the understanding of the proton’s multi-parton structure.

Abstract

With short resumes and highlights the discussions in the different working groups of the workshop MPI@LHC 2012 is documented.

Summary of the Workshop on Multi-Parton Interactions (MPI@LHC 2012)

TL;DR

The paper documents MPI@LHC 2012, synthesizing experimental results, theory, and MC developments across four working groups focused on MPI, diffraction, small-x, DPS, and MC modeling. It highlights tensions between LHC data and standard MC tunes in diffraction and UE observables, and discusses the DPS formalism as both a background to new physics and a probe of multi-parton correlations via and double parton distributions. Theoretical discussions address the nature of DPS, potential 3→4 contributions from perturbative splitting, and the interplay with small-x dynamics, while MC developments showcase advances in EPOS3, color reconnections, and energy-sharing schemes. The report advocates targeted, differential DPS measurements, forward-proton studies, and MC refinements to constrain multi-parton dynamics and improve the understanding of the proton’s multi-parton structure.

Abstract

With short resumes and highlights the discussions in the different working groups of the workshop MPI@LHC 2012 is documented.

Paper Structure

This paper contains 22 sections, 8 equations, 2 figures.

Table of Contents

  1. Introduction
  2. MPI and diffraction
  3. Summary of experimental results
  4. Future outlook and outstanding questions
  5. MPI and small-x
  6. MPI and double-parton scattering
  7. Experimental Discussion
  8. State of the art
  9. LHC studies
  10. Conclusions and future steps
  11. Theoretical Discussion
  12. What are the Double Parton Scatterings?
  13. Which are the general features of a DPS process?
  14. Why to study DPS?
  15. MPI and MC development
  16. ...and 7 more sections

Figures (2)

  • Figure 1: $(a.)$ Schematic diagram for multiple scattering. $(b.)$ Scaled pPb cross section with centrality increasing from top to bottom (bottom = most central)
  • Figure 2: New scaling procedure in Epos3