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arxiv: 2601.00068 · v2 · submitted 2025-12-31 · ✦ hep-ph

Recognition: 2 theorem links

· Lean Theorem

Braking protons at the EIC: from invisible meson decay to new physics searches

Reuven Balkin , Ta'el Coren , Alexander Jentsch , Hongkai Liu , Maksym Ovchynnikov , Yotam Soreq , Sokratis Trifinopoulos
Authors on Pith no claims yet

Pith reviewed 2026-05-16 17:56 UTC · model grok-4.3

classification ✦ hep-ph
keywords EICinvisible decayspseudoscalar mesonsaxion-like particleselectroproductionforward protonsnew physics searches
0
0 comments X

The pith

The Electron-Ion Collider can improve bounds on invisible pseudoscalar meson decays by up to four orders of magnitude.

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

The paper examines how coherent exclusive electroproduction at the EIC produces a forward proton with reduced energy and almost no other detector activity as a signature for invisible final states. This signature applies to neutral mesons whose Standard Model invisible decays are highly suppressed and to gluon-coupled axion-like particles that decay into a dark sector. With the collider's particle identification and kinematics reconstruction, backgrounds can be suppressed enough to reach branching ratios around 10 to the minus eight for eta and eta-prime mesons. Such reach would extend existing limits significantly and open direct probes of ALPs with decay constants up to 10 to the fifth GeV in the 0.1 to 2 GeV mass window.

Core claim

In coherent exclusive electroproduction at the EIC a forward proton with reduced energy and minimal additional activity tags invisible final states. For pseudoscalar mesons this allows branching-ratio sensitivities as low as 10^{-8} for eta and eta-prime invisible decays, strengthening current bounds by up to four orders of magnitude. The same channel directly constrains gluon-coupled ALPs that decay invisibly, reaching decay constants up to 10^5 GeV for masses between 0.1 and 2 GeV.

What carries the argument

Forward proton with reduced energy in coherent exclusive electroproduction, which tags invisible final states while kinematics and particle detection suppress backgrounds.

If this is right

  • New upper limits would be set on invisible branching ratios of the neutral pion, eta, and eta-prime mesons.
  • ALPs with gluon couplings and fa up to 10^5 GeV would be excluded or discovered in the 0.1-2 GeV mass range.
  • The same experimental signature applies to other invisible final states beyond the cases explicitly studied.
  • Kinematic tagging of the forward proton becomes a standard tool for invisible searches at electron-ion facilities.

Where Pith is reading between the lines

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

  • If the background suppression holds, analogous forward-proton tagging could be tested at other high-energy electron facilities.
  • Tighter meson decay bounds would indirectly constrain hidden-sector models that couple to Standard Model pseudoscalars.
  • ALP limits in this mass window would complement existing beam-dump and collider searches by covering a different coupling regime.

Load-bearing premise

Backgrounds from other processes can be reduced far below the signal rate by using the EIC's particle detection and kinematics reconstruction.

What would settle it

A calculation or measurement showing that irreducible backgrounds remain above the level needed to reach branching ratios of 10^{-8} would falsify the projected sensitivity.

Figures

Figures reproduced from arXiv: 2601.00068 by Alexander Jentsch, Hongkai Liu, Maksym Ovchynnikov, Reuven Balkin, Sokratis Trifinopoulos, Ta'el Coren, Yotam Soreq.

Figure 1
Figure 1. Figure 1: FIG. 1. An illustration of the EIC missing-proton [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Feynman diagrams for [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. The EIC projections for invisible ALPs search (see Eq. (3)) in the [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
read the original abstract

We investigate the sensitivity of the Electron-Ion Collider (EIC) to invisible final states in coherent exclusive electroproduction. The characteristic signal is a forward proton with reduced energy and little additional detector activity. Using the excellent particle detection capabilities and kinematics reconstruction at the EIC, we argue that backgrounds can be strongly suppressed. While our analysis applies to various states, we specifically focus on pseudoscalar particles: (i) neutral mesons ($\pi^0,\eta^{(\prime)}$), whose invisible Standard Model decays are extremely suppressed, and (ii) gluon-coupled axion-like particles (ALPs) decaying invisibly to a dark sector. Depending on the meson species and the achievable background rejection, the EIC could strengthen existing bounds on invisible decays of pseudoscalar mesons by up to four orders of magnitude, probing branching ratios as small as ${\rm BR}(\eta^{(\prime)}\to{\rm inv})\sim 10^{-8}$. In addition, the EIC would directly probe invisibly decaying ALPs with the couplings up to $f_a\sim 10^5\,\text{GeV}$ and masses in the range $0.1$-$2\,\text{GeV}$.

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

1 major / 0 minor

Summary. The manuscript investigates the sensitivity of the Electron-Ion Collider (EIC) to invisible final states in coherent exclusive electroproduction. The signal is characterized by a forward proton with reduced energy and minimal additional detector activity. Focusing on pseudoscalar mesons (π⁰, η, η') with invisible Standard Model decays and gluon-coupled axion-like particles (ALPs) decaying invisibly to a dark sector, the authors argue that EIC particle detection and kinematics reconstruction enable strong background suppression. This would allow probing branching ratios as small as BR(η(')→inv)∼10^{-8}, strengthening existing bounds by up to four orders of magnitude, and directly constraining invisibly decaying ALPs with f_a up to ∼10^5 GeV for masses 0.1-2 GeV.

Significance. If the background suppression assumptions hold, the work would provide a novel probe of rare invisible meson decays and ALP couplings in a mass range complementary to existing experiments, potentially improving limits by several orders of magnitude using the EIC's unique kinematics.

major comments (1)
  1. [Abstract] Abstract and background discussion: the central claims of four-order improvement in BR(η(')→inv) sensitivity to ∼10^{-8} and ALP reach to f_a∼10^5 GeV rest on the assertion that backgrounds (single-diffractive dissociation, beam remnants, mis-tagged elastic scattering, photon-induced processes) can be strongly suppressed. However, no quantitative rejection factors, residual background rates after cuts, efficiency curves versus Q²/x, or simulation details are supplied, rendering the projections extrapolations rather than calculated results.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the careful reading and constructive feedback. The major comment correctly identifies that the sensitivity projections rest on background-suppression arguments without accompanying quantitative details. We address this below and will revise the manuscript accordingly.

read point-by-point responses

  1. Referee: [Abstract] Abstract and background discussion: the central claims of four-order improvement in BR(η(')→inv) sensitivity to ∼10^{-8} and ALP reach to f_a∼10^5 GeV rest on the assertion that backgrounds (single-diffractive dissociation, beam remnants, mis-tagged elastic scattering, photon-induced processes) can be strongly suppressed. However, no quantitative rejection factors, residual background rates after cuts, efficiency curves versus Q²/x, or simulation details are supplied, rendering the projections extrapolations rather than calculated results.

    Authors: We agree that the current manuscript presents the projected sensitivities based on qualitative arguments for background rejection rather than explicit quantitative simulations. In the revised version we will add a dedicated section containing Monte Carlo studies of the listed backgrounds. These will include (i) rejection factors achieved by the forward-proton tagging and veto requirements, (ii) residual background rates after all cuts, and (iii) efficiency curves versus Q² and x. The updated projections will then be derived from these calculated quantities rather than from the existing extrapolations. revision: yes

Circularity Check

0 steps flagged

No significant circularity; sensitivity projections rely on external detector assumptions

full rationale

The paper presents projected EIC reach for invisible meson decays and ALPs based on assumed background suppression from detector performance and kinematics reconstruction. No equations reduce the claimed BR~10^{-8} or fa~10^5 GeV contours to fitted parameters defined by the same data. No self-definitional steps, fitted inputs renamed as predictions, or load-bearing self-citations appear in the derivation chain. The analysis is self-contained against external benchmarks of EIC capabilities, with the central claim resting on unverified but independent assumptions rather than tautological reduction.

Axiom & Free-Parameter Ledger

1 free parameters · 0 axioms · 0 invented entities

The central sensitivity claims rest on an unquantified assumption of strong background rejection at the EIC; no free parameters, axioms, or invented entities are explicitly introduced in the abstract.

free parameters (1)
  • background rejection efficiency
    The reach numbers depend on an assumed level of background suppression that is not numerically specified in the abstract.

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discussion (0)

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Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. On Exclusive Coherent Production of Bosons in Electron-Proton Collisions

    hep-ph 2026-04 unverdicted novelty 6.0

    A phenomenological 2-to-3 framework is constructed for exclusive boson electroproduction that matches flux-factorized predictions near Q^{2}=0 while capturing finite-Q^{2} effects at larger virtualities.

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