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arxiv: 2604.24924 · v1 · submitted 2026-04-27 · ✦ hep-ph · hep-ex

Recognition: unknown

Forward backward CP asymmetry in τ^- to K π ν_{τ} in the Left-Right Inverse seesaw model

Authors on Pith no claims yet

Pith reviewed 2026-05-08 02:45 UTC · model grok-4.3

classification ✦ hep-ph hep-ex
keywords CP violationtau lepton decaysLeft-Right Inverse Seesawflavor changing neutral currentsdifferential asymmetriesBelle II experiment
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The pith

In the Left-Right Inverse Seesaw model, a non-decoupling scalar operator generates a pronounced differential forward-backward CP asymmetry in tau to K pi nu_tau decays.

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

The paper investigates CP violation in the decay tau^- to K pi nu_tau within the Left-Right Inverse Seesaw model to address a reported deviation in integrated asymmetry from BaBar. It finds that while the integrated CP asymmetry remains too small to explain the observation, the differential forward-backward asymmetry A_CP^FB(s) exhibits a significant enhancement. This enhancement stems from the interference of the standard model vector current with a new scalar operator arising from box diagrams involving heavy neutrinos. The effect produces distinctive features around specific resonances, making it observable at experiments like Belle II and providing a test of the model's scalar sector.

Core claim

The effective Hamiltonian for Delta S = 1 processes includes a dominant scalar operator g_S generated by a top-quark flavor-changing neutral current box diagram with heavy neutrinos and scalar exchange. This operator leads to a large differential forward-backward CP asymmetry through interference with the SM, while contributions largely cancel in the integrated asymmetry, resulting in kinematic-dependent signals near the K^*(892) and K_0^*(1430) resonances.

What carries the argument

The non-decoupling scalar operator g_S from the top FCNC box diagram, which dominates new physics effects and enables the differential CP violation via interference.

If this is right

  • The differential asymmetry A_CP^FB(s) displays pronounced signals near the K*(892) and K0*(1430) resonances.
  • These angular observables serve as sensitive probes for the LRIS scalar sector at flavor factories.
  • The model predicts testable patterns in differential distributions that integrated measurements miss.

Where Pith is reading between the lines

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

  • Similar differential CP effects might be searched for in other semileptonic tau decays to constrain the same parameters.
  • Confirmation would connect low-energy flavor CP violation directly to the inverse seesaw mechanism for neutrino masses.
  • Future precision data on these asymmetries could bound the heavy neutrino masses and mixings independently of collider searches.

Load-bearing premise

The non-decoupling scalar operator g_S dominates the new physics contribution and its interference with the SM vector current produces a large differential enhancement while canceling in the integrated asymmetry, consistent with existing bounds.

What would settle it

Precise measurements of the differential forward-backward CP asymmetry showing no significant peaks or enhancements near the K* and K0* resonance regions would rule out the predicted signal from the model.

Figures

Figures reproduced from arXiv: 2604.24924 by David Delepine, Shaaban Khalil.

Figure 1
Figure 1. Figure 1: FIG. 1. Tree-level SM contribution to view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Tree-level charged Higgs contribution to view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3 view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. The differential forward-backward CP asymmetry, view at source ↗
read the original abstract

Recent measurements of the integrated CP asymmetry in $\tau \to K\pi\nu_\tau$ decays by the BaBar collaboration exhibit a $2.8\sigma$ deviation from the Standard Model (SM) prediction. In this work, we investigate CP-violating effects in $\tau \to K\pi\nu_\tau$ within the model of the Left--Right Inverse Seesaw (LRIS) model. We show that, although the integrated asymmetry remains too small to account for the BaBar result, the model nevertheless predicts a pronounced signal in the \emph{differential} forward--backward CP asymmetry, $A_{\rm CP}^{\rm FB}(s)$. We derive the effective $|\Delta S| = 1$ Hamiltonian relevant for these decays and identify a dominant non-decoupling scalar operator, $g_S$, generated by a top-quark flavor-changing neutral current box diagram involving heavy neutrinos and scalar exchange. Our numerical analysis demonstrates that, while this contribution largely cancels in the integrated $A_{\rm CP}$, it significantly enhances $A_{\rm CP}^{\rm FB}(s)$ through interference with the SM vector current, leading to distinctive kinematic features near the $K^*(892)$ and $K_0^*(1430)$ resonances. These angular and differential observables provide a sensitive probe of the LRIS scalar sector at current and future flavor experiments, in particular Belle~II.

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 CP-violating effects in the decay τ⁻ → Kπν_τ within the Left-Right Inverse Seesaw (LRIS) model. It derives the effective |ΔS|=1 Hamiltonian, identifies a dominant non-decoupling scalar operator g_S arising from a top-quark flavor-changing neutral current box diagram with heavy neutrinos and scalar exchange, and through numerical analysis shows that while the integrated CP asymmetry is too small to account for the BaBar 2.8σ deviation, the differential forward-backward CP asymmetry A_CP^FB(s) exhibits pronounced signals near the K*(892) and K_0*(1430) resonances due to interference with the SM vector current.

Significance. If the central result holds, this work is significant for providing a distinctive, falsifiable prediction for differential angular observables in tau decays that could be measured at Belle II, offering a probe of the LRIS scalar sector. The strength lies in the explicit derivation of the effective Hamiltonian and the insight that new physics effects can cancel in integrated quantities but appear prominently in differential distributions. This adds to the literature on NP in tau decays by focusing on a specific model and observable.

major comments (1)
  1. §4 (Numerical Analysis): The claim that LRIS parameters can be chosen to yield a sufficiently large g_S for a visible differential enhancement in A_CP^FB(s) near the resonances, while keeping the integrated asymmetry below the BaBar limit and satisfying all other bounds (right-handed W mass, heavy-neutrino mixings, B-decay constraints, μ→eγ), is load-bearing for the central prediction. The manuscript must explicitly document the parameter ranges or benchmark points used in the scan and confirm that the box-diagram dominance persists under the full constraint set; without this, the viability of the reported signal cannot be assessed.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading of the manuscript and for the constructive comment on the numerical analysis. We address the point below and have revised the manuscript to incorporate the requested documentation.

read point-by-point responses
  1. Referee: [—] §4 (Numerical Analysis): The claim that LRIS parameters can be chosen to yield a sufficiently large g_S for a visible differential enhancement in A_CP^FB(s) near the resonances, while keeping the integrated asymmetry below the BaBar limit and satisfying all other bounds (right-handed W mass, heavy-neutrino mixings, B-decay constraints, μ→eγ), is load-bearing for the central prediction. The manuscript must explicitly document the parameter ranges or benchmark points used in the scan and confirm that the box-diagram dominance persists under the full constraint set; without this, the viability of the reported signal cannot be assessed.

    Authors: We agree that explicit documentation of the parameter choices and constraint satisfaction is necessary to substantiate the viability of the predicted signal. In the revised manuscript we have expanded §4 with a new subsection that specifies the scanned ranges for the LRIS parameters (right-handed W mass, heavy-neutrino masses and mixings, scalar vevs and couplings) and presents two explicit benchmark points. For these points we confirm that all listed experimental bounds are satisfied, the integrated A_CP remains below the BaBar limit, and the top-quark FCNC box diagram continues to dominate the scalar operator g_S (other contributions are suppressed by at least an order of magnitude). The differential enhancement in A_CP^FB(s) near the K* and K0* resonances is preserved under these constraints. revision: yes

Circularity Check

0 steps flagged

No circularity: g_S and differential A_CP^FB(s) derived from LRIS box diagrams without fitting to BaBar integrated asymmetry

full rationale

The paper derives the effective |ΔS|=1 Hamiltonian and identifies the non-decoupling scalar operator g_S from explicit top-quark FCNC box diagrams involving heavy neutrinos and scalar exchange in the LRIS model. It then performs a numerical scan over LRIS parameters (subject to external flavor, collider, and precision bounds) to show that the integrated asymmetry stays small while the differential forward-backward asymmetry A_CP^FB(s) receives a visible enhancement near resonances. This is a genuine model prediction, not a fit to the BaBar datum (which the paper states it fails to explain). No self-definitional steps, no fitted inputs renamed as predictions, no load-bearing self-citations that collapse the central claim, and no ansatz smuggled via citation. The derivation chain is self-contained against external benchmarks and does not reduce to its inputs by construction.

Axiom & Free-Parameter Ledger

2 free parameters · 2 axioms · 1 invented entities

The central claim rests on the LRIS model particle content and the assumption that loop-induced scalar operators dominate the new-physics contribution to this decay.

free parameters (2)
  • Heavy neutrino masses and mixings
    Chosen to produce a sizable g_S while keeping the integrated asymmetry small.
  • Scalar sector couplings and vacuum expectation values
    Determine the strength of the non-decoupling scalar operator g_S.
axioms (2)
  • standard math Standard Model effective field theory for |ΔS|=1 non-leptonic transitions
    Basis for constructing the effective Hamiltonian that includes the new scalar operator.
  • domain assumption Dominance of the top-quark FCNC box diagram for the scalar operator g_S
    Invoked to identify the leading new-physics contribution in the LRIS model.
invented entities (1)
  • Heavy right-handed neutrinos and additional scalar fields of the LRIS model no independent evidence
    purpose: Generate the inverse seesaw mechanism for neutrino masses and induce the flavor-changing neutral currents that produce g_S
    Postulated by the model to address neutrino masses; no independent evidence supplied in this paper.

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discussion (0)

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Reference graph

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