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arxiv: 2607.01496 · v1 · pith:GRD5L5CWnew · submitted 2026-07-01 · ⚛️ physics.ins-det · hep-ex

Towards triggerless four-dimensional detectors for High Energy Physics collider experiments

Vladimir V. Gligorov This is my paper

Pith reviewed 2026-07-03 00:28 UTC · model grok-4.3

classification ⚛️ physics.ins-det hep-ex
keywords triggerless detectorspicosecond timingLHC upgradesdata acquisitionHigh Energy Physicsreal-time processing
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The pith

Precision timing combined with high-bandwidth networking may enable future collider detectors to be built triggerless from the start.

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

The paper reviews the planned addition of picosecond timing to the CMS, ATLAS, and LHCb upgrades at the LHC. It argues that this timing, paired with advanced networking, could support detectors that record data without early hardware triggers and instead select events later in software. A sympathetic reader would care because early trigger decisions currently discard most collisions, and removing that step might preserve more potential physics signals.

Core claim

The author claims that the combination of timing and networking technology may enable future detectors to be designed as triggerless from the ground up, and this paradigm shift could bring physics benefits for the field.

What carries the argument

Triggerless detector design that uses picosecond timing for real-time selections instead of dedicated trigger hardware.

If this is right

  • Future detectors could record every collision and perform selections entirely in software.
  • Physics analyses would no longer be limited by the biases or thresholds of early trigger decisions.
  • The same timing information that enables triggerless operation also adds a time dimension to event reconstruction.
  • Data volumes would grow but could be managed through later offline or online filtering.

Where Pith is reading between the lines

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

  • Such designs might scale to detectors at future colliders with even higher data rates.
  • This approach connects to the general problem of managing exponential growth in scientific data across fields.
  • Prototypes could first be tested in smaller experiments or test beams to measure integration challenges.
  • Triggerless operation could change how experiments allocate computing resources between real-time and offline stages.

Load-bearing premise

Advances in picosecond timing and high-bandwidth networking will be sufficient and integrable at the scale required for full collider detectors.

What would settle it

Whether the timing layers now planned for ATLAS and CMS can be integrated with data acquisition networks at full LHC collision rates without requiring a hardware trigger stage.

Figures

Figures reproduced from arXiv: 2607.01496 by Vladimir V. Gligorov.

Figure 1
Figure 1. Figure 1: Instantaneous data rates (bandwidth) of HEP experiments over the past four decades. Data compiled by A. [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: The fraction of LHC bunch crossings which produce a [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Layout of the Mu3e detector, reproduced from Arndt et al. [2021] as permitted by the article’s licence. [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Layout of the NA62 detector, reproduced from Cortina Gil et al. [2017] as permitted by the article’s licence. [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Association of tracks to their origin collision using spatial information. This association is typically based [PITH_FULL_IMAGE:figures/full_fig_p008_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Rate for correct and incorrect assignment of track-times as a function of track [PITH_FULL_IMAGE:figures/full_fig_p009_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Expected performance for charged particle identification in [PITH_FULL_IMAGE:figures/full_fig_p010_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Collision vertex (PV) reconstruction efficiency as a function of track multiplicity for the VELO Upgrade II [PITH_FULL_IMAGE:figures/full_fig_p011_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: LHCb Upgrade II RICH performance to discriminate between pions and kaons, plotted with different time [PITH_FULL_IMAGE:figures/full_fig_p012_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: Material budget inside the tracking volume estimated in units of nuclear interaction lengths of the Phase-2 [PITH_FULL_IMAGE:figures/full_fig_p014_10.png] view at source ↗
read the original abstract

High Energy Physics experiments at flagship colliders produce and process some of the biggest datasets on Earth, with the current generation of flagship experiments at the Large Hadron Collider producing more than a tenth of the world's total internet traffic every second. Moreover the quantities of data produced have increased exponentially over the past decades and this trend shows no sign of slowing down. In parallel, the use of picosecond timing is becoming more common in HEP detectors, enabling qualitatively new approaches to real-time processing and selections. I review the planned introduction of precision timing information into the upcoming upgrades of the CMS, ATLAS, and LHCb experiments. I discuss the ways in which the combination of timing and networking technology may enable future detectors to be designed as triggereless from the ground up, and reflect on the physics benefits of such a paradigm shift for the field.

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 / 3 minor

Summary. The manuscript reviews the planned introduction of precision timing into the CMS, ATLAS, and LHCb upgrades at the LHC. It discusses how the combination of picosecond timing and high-bandwidth networking technologies may enable future collider detectors to be designed as triggerless from the ground up, and reflects on the potential physics benefits of this paradigm shift.

Significance. If the described trends in timing and networking hold, the paper could usefully frame community discussion on 4D detector architectures by synthesizing existing upgrade plans. It receives credit for explicitly hedging its central claim ('may enable', 'could bring') and for focusing on already-planned timing layers rather than claiming new quantitative demonstrations.

minor comments (3)
  1. [Abstract] The abstract states that current LHC experiments produce 'more than a tenth of the world's total internet traffic every second'; a specific citation or data source for this figure would improve verifiability.
  2. The discussion of 'physics benefits' of triggerless designs would benefit from at least one concrete example (e.g., improved acceptance for a specific rare process) even if kept qualitative.
  3. Consider adding a short table or bullet list summarizing the expected timing resolutions and channel counts for the three experiments' timing layers to aid comparison.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the positive assessment of the manuscript, the recognition of its cautious phrasing, and the recommendation for minor revision. No specific major comments were raised in the report.

Circularity Check

0 steps flagged

No significant circularity

full rationale

This is a forward-looking review paper with no equations, derivations, fitted parameters, or mathematical claims. The text discusses existing planned detector upgrades at CMS, ATLAS, and LHCb and speculates on future triggerless designs using hedging language ('may enable', 'could bring'). No load-bearing step reduces to a self-definition, fitted input renamed as prediction, or self-citation chain. The paper is self-contained as a non-quantitative discussion of external technology trends.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The paper draws on established domain knowledge of HEP data rates and timing technology; no free parameters, new axioms, or invented entities are introduced in the abstract.

axioms (1)
  • domain assumption Picosecond timing is becoming more common in HEP detectors
    Presented as background fact in the abstract.

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discussion (0)

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