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arxiv: 1906.11332 · v1 · pith:5W6FWXGVnew · submitted 2019-06-26 · ✦ hep-ph · hep-ex

VBSCan Thessaloniki 2018 Workshop Summary

Pith reviewed 2026-05-25 15:17 UTC · model grok-4.3

classification ✦ hep-ph hep-ex
keywords vector-boson scatteringVBSCanCOST Actioncollider phenomenologyhigh-energy physicsworkshop summaryLHC physics
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The pith

The VBSCan network coordinates studies of vector-boson scattering to best exploit data from existing and future colliders.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This document summarizes the first year of the VBSCan COST Action through talks and discussions at the 2018 Thessaloniki workshop. The action pursues a consistent approach to vector-boson scattering that joins phenomenological modeling with experimental measurements. Coordinated work is presented as the route to extracting the most value from collider data now and ahead. A reader would care because vector-boson scattering offers a direct window on possible new physics once measurements are aligned across groups.

Core claim

The VBSCan COST action is aiming at a consistent and coordinated study of vector-boson scattering from the phenomenological and experimental point of view, for the best exploitation of the data that will be delivered by existing and future particle colliders, as reported in the first year of activity through the talks and discussions at the VBSCan Thessaloniki 2018 workshop.

What carries the argument

The VBSCan COST Action network, which organizes joint phenomenological and experimental work on vector-boson scattering.

If this is right

  • Aligned theoretical predictions and experimental strategies for vector-boson scattering measurements.
  • More efficient extraction of physics results from LHC data and from data expected at future colliders.
  • Clearer identification of open questions that require further joint theoretical and experimental attention.
  • Preparation of analysis tools and methods that multiple groups can apply in a shared framework.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The workshop format may be repeated to track progress on specific open problems in scattering processes.
  • Coordination efforts like this one could reduce duplication in how different collaborations handle similar observables.
  • Lessons from aligning vector-boson scattering work might apply to other processes where theory and experiment must meet at high precision.

Load-bearing premise

The talks and discussions from this single 2018 workshop supply a sufficient foundation for consistent and coordinated study across the wider community.

What would settle it

Publication of mutually inconsistent phenomenological interpretations or experimental analyses of vector-boson scattering after the network began its coordination efforts.

Figures

Figures reproduced from arXiv: 1906.11332 by Alessandro Tarabini, Alexander Karlberg, Alexandros Marantis, Andrzej Siodmok, Ang Li, Anna Mascellani, Antonios Leisos, Apostolos Tsirigotis, Aysel Kayis Topaksu, Borut Kersevan, Carsten Bittrich, Chariclia Petridou, Christian Quaggio, Claude Charlot, Connor Innes Thorburn, Damir Lelas, Daniela Rebuzzi, Dario Mapelli, Davide Valsecchi, Despoina Sampsonidou, Diogo Buarque Franzosi, Duje Giljanovic, Eirini Kasimi, Giacomo Boldrini, Giacomo Ortona, Giovanni Pelliccioli, Giulia Gonella, Hannes Mildner, Henning Kirschenmann, Ilaria Brivio, Ioannis Maznas, Jakob Beyer, Jakob Novak, Jan Kalinowski, Joany Manjarres, J\"urgen Reuter, Kadri Ozdemir, Kimmo Kallonen, Konstantinos Kordas, Kristin Lohwasser, Lilly Wuest, Lucrezia Stella Bruni, Magdalena Slawinska, Marco Zaro, Mathieu Pellen, Matteo Marchegiani, Matthias Ulrich Mozer, Max Neukum, Michael Kobel, Michael Rauch, Micha{\l} Szleper, Michele Grossi, Narei Lorenzo-Martinez, Philippe Gras, Piergiulio Lenzi, Pietro Govoni, Riccardo Bellan, Roberto Covarelli, Simon Pl\"atzer, Spyridon E. Tzamarias, Stefanie Todt, Steven Schramm, Tim Herrmann, Vitaliano Ciulli.

Figure 1
Figure 1. Figure 1: Classifier separation ∆ for the five angularities, determined from the various generators at hadron level for an idealized case of e + e − collisions. The first two columns correspond to IRC-unsafe distributions (multiplicity and p D T ), while the last three columns are the IRC-safe angularities. generalized angularities λ κ β [11]: (κ, β) (0, 0) (2, 0) (1, 0.5) (1, 1) (1, 2) λ κ β : multiplicity p D T LH… view at source ↗
Figure 2
Figure 2. Figure 2: “EFT triangles" for fT0 , fT1 and fT2 : regions in the Λ versus f space where a 5σ BSM signal can be observed and the EFT description is applicable. Unitarity limits are shown in blue, black dashed lines denote the lower limits on 5σ signal significance, black dotted lines denote the upper limits on 2σ statistical consistency between the EFT-controlled signal and the total measured signal. Assumed is √ s =… view at source ↗
Figure 3
Figure 3. Figure 3: Differential distributions dσ/dpT ,e+ (left) and dσ/dmeµµ (right) for W +Z → e + νeµ + µ − produc￾tion obtained with MG5_aMC + SMEFTsim and VBFNLO for two benchmark setups: cW = 0 (SM) and cW = (g 3 /4)fWWW /Λ 2 = 1 TeV−2 . These results show good agreement in the SM case, while there is a small tension between the cross sections computed for cW = 1 TeV−2 , which is probably due to insufficient statistics … view at source ↗
Figure 4
Figure 4. Figure 4: Left: Differential distribution dσ/dpT ,e+ for W +W + jj → e + νeµ + νµjj production obtained with MG5_aMC + SMEFTsim and VBFNLO for cW = 0 (SM) and cW = (g 3 /4)fWWW /Λ 2 = 1 TeV−2 . Right: same as left, with the MG5_aMC distribution for cW = 1 TeV−2 decomposed into contributions of different EFT order. -0.002 0 0.002 0.004 0.006 0.008 0.01 0 500 1000 1500 2000 unitarity limit dσ/dme+νeµ+νµ [fb/GeV] me+νe… view at source ↗
Figure 5
Figure 5. Figure 5: Differential distribution dσ/dmeνeµνµ for W +W + jj → e + νeµ + νµjj production obtained with MG5_aMC + SMEFTsim and VBFNLO for cW = 0 (SM) and cW = (g 3 /4)fWWW /Λ 2 = 1 TeV−2 . interference between diagrams with two and zero cW insertions and between two diagrams with one cW insertion, and so on. It should be noted that other effects, that are not included here, such as contributions from d ≥ 8 operators… view at source ↗
Figure 6
Figure 6. Figure 6: MWW and p e − t distributions in W +W + scattering, in the presence of leptonic cuts: unpolarised full (black), unpolarised OSP (grey), longitudinal-longitudinal (red), longitudinal-transverse (light green), transverse￾longitudinal (dark green), transverse-transverse (blue). The sum of the doubly-polarised distributions is shown in orange. In both figures the black and grey curves perfectly overlap. On the… view at source ↗
Figure 7
Figure 7. Figure 7: Doubly-resonant diagrams contributing to the VBS production of four charged leptons. 12 [PITH_FULL_IMAGE:figures/full_fig_p015_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Distributions in cos θe in ZZ scattering, without lepton cuts: unpolarised full (black), unpolarised OSP projected (grey), sum of polarised (violet), longitudinal (red), left (dark blue) and right (dark green), obtained with PHANTOM. The Legendre analysis results of the full distribution are shown in pink for the longitudinal, light blue and light green for left and right respectively. polarisation modes a… view at source ↗
Figure 9
Figure 9. Figure 9: Distributions in cos θe in ZZ scattering, in the presence of lepton cuts: unpolarised full (black), unpolarised OSP projected (grey), sum of polarised (violet), longitudinal (red), left (dark blue) and right (dark green), obtained with PHANTOM. polarisation modes are separated only for the Z boson decaying into e + e − . – When considering the coherent sum of the transverse modes (left and right), rather t… view at source ↗
Figure 10
Figure 10. Figure 10: Distributions in cos θ µ + in W +Z scattering, in the presence of lepton cuts: unpolarised full (black), sum of polarised (violet), WlongitZlongit (red), WlongitZtransv (blue), WtransvZlongit (green) and WtransvZtransv (grey), obtained with PHANTOM. 15 [PITH_FULL_IMAGE:figures/full_fig_p018_10.png] view at source ↗
Figure 12
Figure 12. Figure 12: Fraction of events with p sum t > psum t cut as a function of p sum t , where p sum t is defined as p lepton max t + p leptom min t Black: Unpolarized ( res.), Blue: Longit.-Longit. (res.), Red: Longit-Trans. (res.), Green: Trans.-Longit. (res.), Violet: Trans.-Trans. (res.) and Cyan: Bkg (LT+TL+TT) 55.23%. To conclude, we studied the cross sections for the different polarization combinations for the VBS … view at source ↗
Figure 13
Figure 13. Figure 13: PDF uncertainty bands (left) and αS uncertainty bands (right), along the variable p WW T , calculated with the PDF sets PDF4LHC15_nlo_mc, PDF4LHC15_nlo_30 and PDF4LHC15_nlo_100. The cross-sections without αS variation are normalized to the central PDF of MC PDF set, while the PDFs from αS variation are normalized to the central PDF of their own set. The spikes in the shape of the uncertainty bands are the… view at source ↗
Figure 14
Figure 14. Figure 14: PDF uncertainty bands (left) and αS uncertainty bands (right), along the variable ∆yjj , calculated with the PDF sets PDF4LHC15_nlo_mc, PDF4LHC15_nlo_30 and PDF4LHC15_nlo_100. The cross-sections without αS variation are normalized to the central PDF of MC PDF set, while the PDFs from αS variation are normalized to the central PDF of their own set. The spikes in the shape of the uncertainty bands are the c… view at source ↗
Figure 15
Figure 15. Figure 15: PDF uncertainty bands (left) and αS uncertainty bands (right), along the variable mjj , calculated with the PDF sets PDF4LHC15_nlo_mc, PDF4LHC15_nlo_30 and PDF4LHC15_nlo_100. The cross-sections without αS variation are normalized to the central PDF of MC PDF set, while the PDFs from αS variation are normalized to the central PDF of their own set. The spikes in the shape of the uncertainty bands are the co… view at source ↗
Figure 16
Figure 16. Figure 16: Relative error of longitudinal neutrino (p rec νL - p th νL) as a function of one of the event kinematic variables [PITH_FULL_IMAGE:figures/full_fig_p028_16.png] view at source ↗
Figure 17
Figure 17. Figure 17: Reconstruction efficiency of W transverse momentum at simlation level, for the different Selections listed in the text and for their combination. M W1 T = 2(|p µ T ||p1 | − p µ T · p1 ), MW2 T = 2(|p e T||p2 | − p e T · p2 ). The minimum of the function f defines the quantity MT2: MT2 ≡ min p1+p2=p miss T f(p1 , p2 ) = f| p νe 0 T ,p νµ 0 T . (15) Without entering into mathematics details, the exact solut… view at source ↗
Figure 18
Figure 18. Figure 18: Evaluation of MT2 as a result of the maximization problem described, using data coming from detector smearin Introducing the angle ϕ0 - between p miss T and p `` T we obtain a second order equation, in parametric form where the x-axis of coordinate system coincides with the p `` T direction. |p1 | = −g(ϕ) ± q g(ϕ) 2 − 4cf(ϕ) 2f(ϕ) , p2 = p miss T − p1 . Minimum of MT2 on the intersection curve can be foun… view at source ↗
Figure 19
Figure 19. Figure 19: Distribution of cos θ for the longitudinal and the transverse components of the electron using MAOS algorithm, and before and after detector simulation. 2.2 VBS at linear colliders ‡ Surpassing the WW and ZZ threshold at LEP2 in 1996/97 proved the non-Abelian structure of the electroweak theory and offered for the first time the possibility to search for anomalous triple gauge cou￾plings. Future lepton co… view at source ↗
Figure 20
Figure 20. Figure 20: Comparison of the stand-alone (red) and the reweighted (blue) distributions in the di-lepton invariant mass (left) and lepton η (right) distributions. The aQGC parameter points chosen are (α4 , α5 ) = (0.06, 0.00) The baseline point used for the reweighting is depicted for reference: (α4 , α5 ) = (0.10, 0.00) (green) [PITH_FULL_IMAGE:figures/full_fig_p034_20.png] view at source ↗
Figure 21
Figure 21. Figure 21: Comparison of the lepton pT (left) and MC weight (right) distribution different reweighting samples to the aQGC parameter point fT ,0 = cT0 = 1 TeV−4 . The stand-alone prediction is shown in red. One of the baseline points used for reweighting is depicted in dotted black. The corresponding reweighting result is shown in dashed blue. In dotted green and orange, two additional reweighted samples are shown, … view at source ↗
Figure 22
Figure 22. Figure 22: Comparison of a MC sample generated at a nominal value of fS,0 = 8 TeVreweighted to the SM scenario (left) and the yield ratios of discrete parameter values for m`` > 400 GeV in the ssWW channel (right). The reweighting results in discrepancies smaller than 5 % and the quadratic polynomial provides a good model to describe the yield ratios [PITH_FULL_IMAGE:figures/full_fig_p036_22.png] view at source ↗
Figure 23
Figure 23. Figure 23: Scan of 2∆NLL for the coefficient fS,0/Λ 4 using the available information. The blue line shows the observed and the black line the expected distributions. A horizontal line at 2∆NLL = 3.84 is drawn to derive the 95 % C.L. limits. 3.3 Machine learning for jets (reconstruction) ‡ Jets are the experimental signatures of quarks and gluons produced in high-energy processes such as hard scattering of partons i… view at source ↗
Figure 24
Figure 24. Figure 24: (Left) Misidentification probability for c and light-flavour jets versus b jet identification efficiency for various b tagging algorithms applied to jets in tt¯events [114]. (Right) Performance of the DeepCSV (retrained for the Phase 1 detector geometry) and DeepFlavour b jet identification algorithms demonstrating the probability for non-b jets to be misidentified as b jet, as a function of the efficienc… view at source ↗
Figure 25
Figure 25. Figure 25: (Left) a comparison of W-taggers based on simple two-variable cuts or ML classifiers trained using high￾level jet substructure information, showing a moderate improvement when using either BDTs or DNNs [120]. (Right) the uncertainty associated with the W-tagging DNN ML classifier as evaluated in semi-leptonic tt¯ events [120]. When using the same approach to derive uncertainties for the simple two-variabl… view at source ↗
read the original abstract

This document reports the first year of activity of the VBSCan COST Action network, as summarised by the talks and discussions happened during the VBSCan Thessaloniki 2018 workshop. The VBSCan COST action is aiming at a consistent and coordinated study of vector-boson scattering from the phenomenological and experimental point of view, for the best exploitation of the data that will be delivered by existing and future particle colliders.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 0 minor

Summary. This manuscript reports the first year of activity of the VBSCan COST Action network, as summarised by the talks and discussions at the VBSCan Thessaloniki 2018 workshop. The VBSCan COST action aims at a consistent and coordinated study of vector-boson scattering from the phenomenological and experimental point of view for the best exploitation of data from existing and future particle colliders.

Significance. As a purely descriptive workshop summary with no derivations, data analysis, or quantitative predictions, the manuscript provides an archival record of the 2018 event and the network's initial activities. If the reporting is accurate, it may aid internal coordination within the VBSCan community but does not advance the field through new results or falsifiable claims.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the careful review and the positive recommendation to accept the manuscript. The document is explicitly intended as a workshop summary reporting the initial activities of the VBSCan COST Action, and we are pleased that this scope is recognized.

Circularity Check

0 steps flagged

No significant circularity

full rationale

This is a workshop summary document whose central claim is descriptive reporting of the first year of VBSCan COST Action activities via the 2018 Thessaloniki talks and discussions. No derivations, data, equations, or quantitative predictions are presented, so no technical assumptions are required for the claim to hold and no load-bearing steps reduce to self-citation or fitted inputs. The document is self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The document introduces no free parameters, axioms, or invented entities because it is a workshop summary report rather than a theoretical or experimental paper.

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Reference graph

Works this paper leans on

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