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arxiv: 2604.13231 · v1 · pith:AWJ6J42Wnew · submitted 2026-04-14 · ✦ hep-ex

Proposal for the first measurement of antiproton polarization in proton-nucleus interactions

D. Alfs , D. Grzonka , G. Khatri , P. Kulessa , J. Ritman , T. Sefzick , J. Smyrski , V. Verhoeven
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H. Xu M. Zielinski
This is my paper

Pith reviewed 2026-05-10 13:39 UTC · model grok-4.3

classification ✦ hep-ex
keywords antiproton polarizationtransverse polarizationproton-nucleus collisionsCoulomb-nuclear interferenceelastic scatteringspin structureMonte Carlo simulationCERN experiment
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The pith

A CERN experiment could detect whether antiprotons from unpolarized proton-nucleus collisions acquire transverse polarization.

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

The paper proposes the first dedicated measurement of transverse polarization for antiprotons produced in proton-nucleus collisions. It remains unknown whether these antiprotons develop polarization through spin-dependent interactions and nonperturbative hadronization, even though such effects have been studied for other hadrons. A positive or negative result would add new constraints on the spin-dependent part of the antinucleon-nucleon interaction, which current data constrain only weakly. Monte Carlo simulations of the proposed detector layout at CERN show that the left-right asymmetry in elastic antiproton-proton scattering within the Coulomb-nuclear interference region can be measured with statistics sufficient to reveal polarization at the few-percent level.

Core claim

It is presently unknown whether antiprotons produced in unpolarized hadronic collisions can acquire a transverse polarization as a result of spin dependent pbar N interactions and nonperturbative hadronization mechanisms. Establishing the presence or absence of such an effect would provide new empirical constraints on the spin structure of the antinucleon-nucleon interaction. We investigate the experimental feasibility of a first dedicated measurement of the transverse polarization of antiprotons produced in proton-nucleus collisions by accessing the left-right asymmetry in elastic pbar p scattering in the Coulomb Nuclear Interference region, and Monte Carlo simulations of the proposed CERN-

What carries the argument

left-right asymmetry in elastic antiproton-proton scattering in the Coulomb-nuclear interference region, quantified through Monte Carlo simulation of detector response and kinematics

If this is right

  • Detection of nonzero polarization would demonstrate spin-dependent effects specific to antiproton production and interaction.
  • A null result would indicate that nonperturbative mechanisms do not generate transverse polarization for antiprotons in these collisions.
  • The measurement would supply the first direct empirical bound on the transverse spin transfer in unpolarized proton-nucleus reactions.
  • It would test whether polarization phenomena observed for other hadrons extend to the antinucleon sector.

Where Pith is reading between the lines

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

  • The result could guide theoretical models of spin generation during hadronization by providing a new data point for antiparticles.
  • It might motivate similar polarization searches with other beams or targets to map dependence on collision system.
  • Confirmation of the effect would strengthen the case for including spin observables in future antinucleon-nucleon scattering calculations.

Load-bearing premise

The Monte Carlo simulations correctly predict detector performance, background levels, and scattering kinematics in the Coulomb-nuclear interference region.

What would settle it

A statistically significant nonzero left-right asymmetry measured in the proposed elastic scattering data, or a null result consistent with zero within the estimated uncertainty, would confirm or refute the presence of polarization at the simulated sensitivity.

Figures

Figures reproduced from arXiv: 2604.13231 by D. Alfs, D. Grzonka, G. Khatri, H. Xu, J. Ritman, J. Smyrski, M. Zielinski, P. Kulessa, T. Sefzick, V. Verhoeven.

Figure 1
Figure 1. Figure 1: Preliminary calculations of Ay within the one￾boson exchange model based on NN¯ potentials adjusted to experimental data, performed by J. Haidenbauer [54– 56]. Points colors represent Ay values obtained based on the model calculations for existing experimental data on pp¯ scattering measured for different momenta as indicated in the figure. angle between the positive side of the y-axis and the spin project… view at source ↗
Figure 2
Figure 2. Figure 2: Scheme of the proposed experimental setup for determining the antiproton polarization. The beam enters from [PITH_FULL_IMAGE:figures/full_fig_p006_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: (left) Measured differential cross section of pp¯ forward elastic scattering for the beam momentum plab = 3.7 GeV/c [69] (black points). The superimposed red line indicates the fit function dσ/dt = p0(exp(−t/p1) + p2t+p3). (right) Number of events as a function of the four-momentum transfer where blue histogram denotes events before scaling and superimposed red histogram represents events after scaling usi… view at source ↗
Figure 4
Figure 4. Figure 4: (left) Exemplary distribution of the ϕ angle for antiproton tracks. The superimposed red curve denotes the fit according to equation 6. (right) The event sample was categorized based on the orientation of the vector normal to the scattering plane. For example: events scattered to the left point upwards and the scattering polar angle ϕ = 90o . The polarization of the sample in this simulation was equal to 1… view at source ↗
Figure 5
Figure 5. Figure 5: Analyzing power as a function of the scattering [PITH_FULL_IMAGE:figures/full_fig_p008_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: (left) Example of the reconstructed AyP value obtained from the fit according to Eq. 6 as a function of the number of events N with reconstructed primary and scattered tracks in the polar angular range 6 < θ < 42 mrad. The horizontal axis is restricted to N = 20 000 events to illustrate individual AyP values together with their statistical uncertainties. (right) Figure of Merit (F oM) resulting from the as… view at source ↗
read the original abstract

Spin dependent phenomena in inclusive hadron production have been extensively investigated, yet their microscopic origin and universality across different hadrons are still not fully understood. In particular, it is presently unknown whether antiprotons produced in unpolarized hadronic collisions can acquire a transverse polarization as a result of spin dependent $\bar{p}N$ interactions and nonperturbative hadronization mechanisms. Establishing the presence or absence of such an effect would provide new empirical constraints on the spin structure of the antinucleon-nucleon interaction, which is only weakly constrained by existing data. In this work, we investigate the experimental feasibility of a first dedicated measurement of the transverse polarization of antiprotons produced in proton-nucleus collisions. The polarization is accessed through the left-right asymmetry in elastic $\bar{p}p$ scattering in the Coulomb Nuclear Interference region. Based on detailed Monte Carlo simulations of the proposed experimental setup at the European Organization for Nuclear Research (CERN), we estimate the statistical sensitivity required to detect a certain degree of polarization.

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 / 2 minor

Summary. The manuscript proposes the first dedicated measurement of transverse antiproton polarization in proton-nucleus collisions at CERN. Polarization is accessed via the left-right asymmetry in elastic antiproton-proton scattering in the Coulomb-nuclear interference region at small |t|. Detailed Monte Carlo simulations of the proposed detector setup are used to estimate the statistical sensitivity required to detect a nonzero polarization.

Significance. If the Monte Carlo modeling of production kinematics, CNI scattering, backgrounds, and detector response holds, the proposed measurement would supply the first empirical constraints on spin-dependent effects in antiproton production and the spin structure of the antinucleon-nucleon interaction, a domain that remains weakly constrained by existing data. The work is a timely experimental proposal that identifies a feasible path to a new observable.

major comments (1)
  1. [Monte Carlo Simulations section] Monte Carlo Simulations section: the quoted statistical sensitivities rest entirely on the fidelity of the simulations to CNI-region kinematics, background rates, and detector acceptance, yet the manuscript provides no description of the specific hadronic models employed, input parameter choices, or any benchmarking against existing antiproton scattering data or prior detector performance measurements in the relevant regime; mismatches here would directly scale the projected sensitivity and therefore constitute a load-bearing uncertainty for the central feasibility claim.
minor comments (2)
  1. [Abstract] The abstract and introduction would be strengthened by an explicit statement of the target polarization magnitude assumed when quoting the required integrated luminosity or running time.
  2. Figure captions for the simulated asymmetry distributions should include the specific |t| range and background subtraction method used.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the positive evaluation of the scientific significance of our proposal and for the constructive comment regarding the Monte Carlo simulations. We address this point below and will revise the manuscript accordingly.

read point-by-point responses

  1. Referee: [Monte Carlo Simulations section] Monte Carlo Simulations section: the quoted statistical sensitivities rest entirely on the fidelity of the simulations to CNI-region kinematics, background rates, and detector acceptance, yet the manuscript provides no description of the specific hadronic models employed, input parameter choices, or any benchmarking against existing antiproton scattering data or prior detector performance measurements in the relevant regime; mismatches here would directly scale the projected sensitivity and therefore constitute a load-bearing uncertainty for the central feasibility claim.

    Authors: We agree that the absence of details on the hadronic models, input parameters, and benchmarking constitutes a significant gap that affects the credibility of the projected sensitivities. The current manuscript does not include this information. In the revised version we will expand the Monte Carlo Simulations section to specify the event generators and physics lists employed, the chosen input parameters with their justification, and any benchmarking performed against existing antiproton production or scattering data. This addition will make the simulation framework transparent and allow an independent assessment of the feasibility estimates. revision: yes

Circularity Check

0 steps flagged

No circularity: experimental proposal with independent MC-based estimates

full rationale

The paper is a pure experimental proposal whose central estimate (statistical sensitivity via left-right asymmetry in the CNI region) is obtained from external Monte Carlo simulations of a proposed CERN setup. No equations, derivations, fitted parameters, or self-citations are used to generate or justify any result; the manuscript produces no output that is then fed back as input. All load-bearing assumptions (MC fidelity to kinematics, backgrounds, and detector response) are external to the paper and not derived from its own content.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The proposal depends on the accuracy of Monte Carlo modeling of particle production and scattering at CERN energies, plus standard assumptions about detector performance and beam conditions.

axioms (1)
  • domain assumption Monte Carlo event generators and detector response models correctly reproduce the kinematics and backgrounds in the Coulomb-nuclear interference region for antiproton-proton scattering.
    The sensitivity estimate is derived entirely from these simulations; the abstract provides no independent validation.

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