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arxiv: 2606.25869 · v1 · pith:IVDEIEPKnew · submitted 2026-06-24 · ✦ hep-ph

Leptonic CP asymmetry and heavy neutrino searches in seesaw scenario

Arindam Das , Wei Liu , Supriya Senapati This is my paper

Pith reviewed 2026-06-25 20:08 UTC · model grok-4.3

classification ✦ hep-ph
keywords heavy Majorana neutrinostype-I seesawLHC searchesCP asymmetrydilepton channelslight-heavy mixingsame-sign opposite-sign ratio
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The pith

In type-I seesaw, LHC sensitivity to light-heavy neutrino mixing improves by an order of magnitude for 60-80 GeV masses when same-sign to opposite-sign dilepton ratio is near one.

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

The paper examines prospects for detecting heavy Majorana neutrinos produced with charged leptons at the 14 TeV LHC, followed by their decays to dilepton plus dijet final states. It performs a cut-based detector-level analysis of both same-sign and opposite-sign dilepton channels to extract sensitivity as a function of the ratio R_ll. For R_ll near one, the projected upper limits on the light-heavy mixing improve by about a factor of ten over existing LHC bounds at 140 fb^{-1} for masses 60-80 GeV, with another factor of ten expected at the HL-LHC. The reach in the 50-100 GeV window is shown to track both R_ll and the associated leptonic CP asymmetry.

Core claim

The central claim is that collider sensitivity to the light-heavy neutrino mixing in the type-I seesaw depends strongly on the ratio R_ll of same-sign to opposite-sign dilepton events; when R_ll is approximately one, the LHC at 140 fb^{-1} can set mixing limits an order of magnitude stronger than current bounds for M_N between 60 and 80 GeV, with further improvement at 3 ab^{-1}, while the sensitivity falls for smaller R_ll and the 50-100 GeV mass interval exhibits a direct correlation between reach, R_ll, and CP asymmetry.

What carries the argument

The ratio R_ll of same-sign to opposite-sign dilepton events, which encodes the leptonic CP asymmetry arising from the light-heavy neutrino mixing in the type-I seesaw.

If this is right

  • For R_ll approximately 1 the mixing constraints improve by one order of magnitude at 140 fb^{-1} for M_N of 60-80 GeV.
  • An additional order-of-magnitude gain is expected at the HL-LHC with 3 ab^{-1}.
  • Sensitivity falls substantially once R_ll drops below one.
  • In the 50-100 GeV mass window the collider reach is directly tied to the value of R_ll and the size of the CP asymmetry.

Where Pith is reading between the lines

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

  • Precise measurement of R_ll would immediately translate into an expected sensitivity curve for mixing searches in the same dataset.
  • The mass window 50-100 GeV is singled out as the region where R_ll and CP-asymmetry effects are strongest, suggesting targeted oscillation searches there.

Load-bearing premise

The cut-based analysis and background modeling in the detector-level simulation accurately capture the dominant Standard Model processes and detector efficiencies for the chosen final states.

What would settle it

If data at 140 fb^{-1} yields a number of same-sign and opposite-sign events that fails to produce the projected order-of-magnitude improvement in the upper limit on mixing when R_ll is near one, the claimed sensitivity gain would be ruled out.

Figures

Figures reproduced from arXiv: 2606.25869 by Arindam Das, Supriya Senapati, Wei Liu.

Figure 1
Figure 1. Figure 1: FIG. 1: Branching ratios of the RHN [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2: Absolute value of the CP asymmetry parameter as a function of [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3: Projected 95% CL exclusion sensitivities to [PITH_FULL_IMAGE:figures/full_fig_p009_3.png] view at source ↗
read the original abstract

We investigate the prospects for probing heavy Majorana neutrinos in the type-I seesaw framework at the 14 TeV LHC. In this scenario, the light-heavy neutrino mixing enables the production of heavy neutrinos in association with charged leptons, followed by decays into dilepton plus dijet final states. We perform a detector-level cut-based analysis of both same-sign (SS) and opposite-sign (OS) dilepton channels and investigate the sensitivity as a function of the ratio $R_{ll}$ of SS to OS events. We derive projected constraints on the light-heavy neutrino mixing as a function of the heavy-neutrino mass. For $R_{ll} \simeq 1$, the sensitivity at $140~\rm{fb}^{-1}$ improves upon current LHC bounds by about one order of magnitude for $M_N \simeq 60-80~\rm{GeV}$, with a further order of magnitude improvement expected at the HL-LHC with $3~\rm{ab}^{-1}$. The sensitivity decreases substantially for smaller $R_{ll}$. We show that, for $50~\text{GeV} \lesssim M_N \lesssim 100~\text{GeV}$, the collider reach is strongly correlated with $R_{ll}$ and the associated CP asymmetry, providing additional motivation for future measurements of $R_{ll}$ and heavy-neutrino oscillations at colliders.

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 / 1 minor

Summary. The paper investigates prospects for probing heavy Majorana neutrinos in the type-I seesaw at the 14 TeV LHC via production in association with charged leptons and decays to dilepton+dijet final states. It performs a detector-level cut-based analysis in both same-sign (SS) and opposite-sign (OS) channels, derives projected constraints on the light-heavy neutrino mixing |V_lN|^2 as a function of heavy neutrino mass M_N, and shows that for R_ll ≃ 1 the sensitivity at 140 fb^{-1} improves current LHC bounds by ~1 order of magnitude for M_N ≃ 60-80 GeV (with further improvement at HL-LHC), while the reach for 50 GeV ≲ M_N ≲ 100 GeV is strongly correlated with R_ll and the associated CP asymmetry.

Significance. If the simulation-based projections are accurate, the work provides a concrete link between measurable collider observables (R_ll and leptonic CP asymmetry) and the sensitivity reach in the seesaw parameter space, offering additional motivation for dedicated measurements of these quantities at the LHC and HL-LHC.

major comments (1)
  1. [detector-level analysis and results sections] The central projected sensitivity improvement (abstract and § on results) for R_ll ≃ 1 at 140 fb^{-1} and M_N ≃ 60-80 GeV rests on the accuracy of the cut-based detector-level simulation for signal efficiencies and dominant SM backgrounds (W+jets, ttbar, diboson) in the SS/OS dilepton+dijet channels. No data-driven cross-check or direct comparison to existing LHC measurements in the same final states is presented, which is load-bearing because the signal kinematics overlap strongly with SM processes in this mass range; any background underestimation would directly inflate the quoted |V_lN|^2 limits.
minor comments (1)
  1. The abstract and main text should explicitly state the assumed integrated luminosities, parton-shower and detector simulation tools, and any systematic uncertainties assigned to the background modeling.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the careful reading of our manuscript and the constructive comment. We address the major point below.

read point-by-point responses

  1. Referee: [detector-level analysis and results sections] The central projected sensitivity improvement (abstract and § on results) for R_ll ≃ 1 at 140 fb^{-1} and M_N ≃ 60-80 GeV rests on the accuracy of the cut-based detector-level simulation for signal efficiencies and dominant SM backgrounds (W+jets, ttbar, diboson) in the SS/OS dilepton+dijet channels. No data-driven cross-check or direct comparison to existing LHC measurements in the same final states is presented, which is load-bearing because the signal kinematics overlap strongly with SM processes in this mass range; any background underestimation would directly inflate the quoted |V_lN|^2 limits.

    Authors: We thank the referee for this observation. Our analysis is a Monte Carlo projection study employing standard tools (MadGraph5_aMC@NLO for generation, Pythia 8 for parton showering and hadronization, and Delphes 3 with the CMS card for detector simulation). Background normalizations follow NLO/NNLO predictions from the literature, and the kinematic selections are chosen to be consistent with published LHC searches in the same final states. We agree that an explicit data-driven cross-check or side-by-side comparison to existing Run-2 measurements would strengthen the presentation. In the revised version we will add a short subsection (in the detector-level analysis section) that (i) references the relevant ATLAS and CMS measurements in dilepton+dijet channels, (ii) states the level of agreement between our simulated distributions and those measurements where overlap exists, and (iii) quantifies the effect of a conservative 20-30% background normalization uncertainty on the projected |V_lN|^2 limits. This constitutes a partial revision; the core cut-based efficiencies and resulting sensitivity curves remain simulation-based, as is conventional for HL-LHC projections. revision: partial

Circularity Check

0 steps flagged

No circularity in forward simulation of projected LHC sensitivities

full rationale

The paper conducts a detector-level cut-based analysis of SS and OS dilepton+dijet channels to produce projected constraints on |V_lN|^2 versus M_N for different R_ll values. This is a standard forward Monte Carlo projection exercise that computes expected event yields and limits from assumed cross sections, efficiencies, and backgrounds; the output limits are not obtained by fitting any parameter to the target data and then relabeling the fit as a prediction. No equations reduce the claimed sensitivity gains to a self-defined quantity, no load-bearing self-citations close the central argument, and the derivation remains independent of the final numerical projections. The reader's assessment of score 2 is consistent with minor normal self-citation that does not affect the result.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The projections rest on standard LHC simulation assumptions (parton showering, detector response, background composition) that are not derived in the paper; no new free parameters or invented entities are introduced beyond the conventional seesaw mixing angle and heavy neutrino mass.

axioms (1)
  • domain assumption Standard Model backgrounds and detector efficiencies can be modeled sufficiently accurately for cut-based selection in dilepton plus dijet final states.
    Required for any projected sensitivity derived from simulation; location implicit in the statement of projected constraints.

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Reference graph

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