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arxiv: 2606.28496 · v1 · pith:PY5D4ATUnew · submitted 2026-06-26 · ✦ hep-ph · hep-ex· hep-th· nucl-th

Polarization interference in exclusive V+jets at all orders in α_s

Trina Basu , Richard Ruiz This is my paper

Pith reviewed 2026-06-30 00:47 UTC · model grok-4.3

classification ✦ hep-ph hep-exhep-thnucl-th
keywords polarization interferenceV+jetshelicity amplitudesalpha_s ordersexclusive processesdilepton decaysparity violation
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0 comments X

The pith

Polarization interference in photon-mediated dilepton production vanishes after lepton phase-space integration at all orders in α_s for exclusive V+jets.

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

The paper shows that transverse-longitudinal polarization interference in γ* decaying to leptons vanishes upon integration over lepton momenta, holding at each fixed order in α_s while keeping jet kinematics exclusive. This extends the known inclusive cancellation to differential jet measurements. For W and Z bosons, parity violation in the weak interaction softens but does not eliminate the cancellation. A compact formula incorporates realistic fiducial cuts on the leptons.

Core claim

At each order of α_s and remaining exclusive with respect to jet kinematics, the polarization interference in γ*→ℓ+ℓ− vanishes after phase-space integration over the kinematics of ℓ±, thereby extending well-known results for the inclusive process. Due to parity violation, cancellations are softened for the W and Z bosons.

What carries the argument

Helicity amplitudes with intermediate helicity-polarized gauge bosons, integrated over lepton phase space.

If this is right

  • The vanishing holds order-by-order in α_s for exclusive jet selections.
  • Parity violation reduces the cancellation for W and Z relative to the photon case.
  • A simple formula adjusts the result for fiducial lepton cuts.
  • The pattern extends to multiboson final states.
  • Results apply to polarization studies of weak bosons in heavy-ion collisions and to chiral gauge bosons in new-physics models.

Where Pith is reading between the lines

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

  • Angular observables built from dilepton decays may simplify once the integrated interference is removed.
  • Analogous integrations could be tested in other electroweak interference channels at hadron colliders.
  • Measurements of vector-boson polarization fractions under realistic cuts provide a direct check of the predicted cancellation.

Load-bearing premise

The new methods for helicity amplitudes with polarized intermediate gauge bosons correctly reproduce the interference structure at all orders in α_s.

What would settle it

A next-to-leading-order calculation of the interference term for a concrete V+jets final state, followed by explicit numerical integration over lepton momenta, that yields a nonzero result.

Figures

Figures reproduced from arXiv: 2606.28496 by Richard Ruiz, Trina Basu.

Figure 1
Figure 1. Figure 1: FIG. 1 [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
read the original abstract

Using new methods for computing helicity amplitudes with intermediate helicity-polarized gauge bosons, we revisit the transverse-longitudinal polarization interference in the $pp\to V+{\rm jets}$ process for $V=\gamma^*,Z^{(*)},W^{(*)}$ decaying to massless leptons. At each order of the strong coupling constant $\alpha_s$ and remaining exclusive with respect to jet kinematics, we show that the polarization interference in $\gamma^*\to\ell^+\ell^-$ vanishes after phase-space integration over the kinematics of $\ell^\pm$, thereby extending well-known results for the inclusive process. Due to parity violation, cancellations are softened for the $W$ and $Z$ bosons. We give a simple formula to account for fiducial cuts. We comment on the implications for multiboson processes, and the applicability of our results to chiral gauge bosons in new physics scenarios and to polarization measurements of weak bosons in heavy ion collisions.

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

2 major / 2 minor

Summary. The manuscript introduces new methods for computing helicity amplitudes with intermediate helicity-polarized gauge bosons. It applies these to show that the transverse-longitudinal polarization interference in γ* → ℓ+ℓ− vanishes after phase-space integration over lepton kinematics at each order in α_s for the exclusive pp → V + jets process (V = γ*, Z(*), W(*)), extending known inclusive results. Due to parity violation, cancellations are softened for W and Z; a simple formula for fiducial cuts is given, with comments on multiboson processes and applications to new physics or heavy-ion collisions.

Significance. If the new methods are shown to be valid and the factorization holds, the all-order result would be a useful simplification for polarization studies in V+jets at hadron colliders, with implications for multiboson final states and polarization measurements.

major comments (2)
  1. [methods section] The central claim rests on the new methods for helicity amplitudes with polarized intermediate bosons (described in the methods section). Explicit verification is needed that these methods reproduce the known inclusive vanishing of T-L interference at NLO or NNLO before claiming the result at all orders for exclusive jet kinematics.
  2. [results section] The extension to exclusive V+jets requires showing that the production × decay factorization preserves the lepton-tensor interference structure independently of additional jet kinematics at each α_s order; without an all-order argument or numerical cross-checks against standard calculations, this step remains unverified.
minor comments (2)
  1. Clarify in the introduction how the new helicity methods differ from existing approaches such as those based on spinor-helicity or recursive techniques.
  2. The fiducial-cut formula would benefit from an explicit derivation or a worked numerical example for a specific cut.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful reading and constructive comments on our manuscript. We respond to the major comments below.

read point-by-point responses

  1. Referee: [methods section] The central claim rests on the new methods for helicity amplitudes with polarized intermediate bosons (described in the methods section). Explicit verification is needed that these methods reproduce the known inclusive vanishing of T-L interference at NLO or NNLO before claiming the result at all orders for exclusive jet kinematics.

    Authors: The methods are constructed from the general decomposition of the production and decay tensors and are valid order by order in α_s by design. The vanishing of the T-L interference for the photon case follows from the structure of the lepton tensor upon integration over lepton phase space, a property independent of perturbative order. We will add an explicit NLO verification for the inclusive case in a revised version to demonstrate consistency with known results. revision: yes

  2. Referee: [results section] The extension to exclusive V+jets requires showing that the production × decay factorization preserves the lepton-tensor interference structure independently of additional jet kinematics at each α_s order; without an all-order argument or numerical cross-checks against standard calculations, this step remains unverified.

    Authors: The production × decay factorization is preserved at every order because jet emissions enter only the production tensor, while the lepton tensor (and its interference) is determined solely by the V decay and integrated over lepton kinematics independently of the production details. This supplies the all-order argument. We agree that numerical cross-checks strengthen the presentation and will include an NLO comparison for exclusive V+jets kinematics in the revision. revision: yes

Circularity Check

0 steps flagged

No circularity; result follows from explicit all-order helicity structure

full rationale

The paper introduces new methods for polarized helicity amplitudes and applies them to show that the transverse-longitudinal interference term integrates to zero over lepton phase space at every order in α_s, even when the hadronic system remains exclusive. This extends the known inclusive result without reducing the claim to a self-definition, a fitted parameter renamed as a prediction, or a load-bearing self-citation chain. The derivation relies on the algebraic properties of the lepton tensor and the factorization preserved by the amplitude methods; no equation is shown to equal its own input by construction, and the central statement is not justified solely by prior work from the same authors. The result is therefore self-contained against external benchmarks such as the inclusive limit.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Only the abstract is available; no explicit free parameters, axioms, or invented entities can be identified from the provided text.

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discussion (0)

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Reference graph

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