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arxiv: 2606.25936 · v1 · pith:AQ2SJHSMnew · submitted 2026-06-24 · ✦ hep-ph

Complementary probes of Bilinear RPV SUSY models with a wino-like LSP via Neutrino Oscillation and LHC

Arghya Choudhury , Arpita Mondal This is my paper

Pith reviewed 2026-06-25 20:02 UTC · model grok-4.3

classification ✦ hep-ph
keywords bilinear R-parity violationwino-like LSPneutrino oscillationsLHC trilepton searchessupersymmetrychargino neutralino decaysMarkov Chain Monte Carloflavor observables
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The pith

In bilinear RPV SUSY, wino-like charginos and neutralinos are excluded up to 565 GeV by LHC Run II when their Z l branching ratio is 23 percent at the best-fit point from neutrino data.

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

The paper uses a Markov Chain Monte Carlo scan to explore the parameter space of bilinear R-parity violating supersymmetry, constrained by neutrino oscillation measurements, the observed Higgs mass and couplings, and flavor physics observables. From the allowed points it extracts the decay branching ratios of the wino-like lighter chargino and lightest neutralino, showing that these ratios to different lepton flavors depend on the neutrino mass hierarchy. At the best-fit point the branching ratio for the chargino to decay to a Z boson plus a charged lepton reaches about 23 percent. This value is then used to reinterpret LHC trilepton searches, yielding an exclusion of the mass-degenerate wino-like states up to 565 GeV from existing Run-II data and a projected reach of 950 GeV at the High-Luminosity LHC.

Core claim

The central discovery is that the branching ratio Br(χ̃1± → Z l±) ∼ 23% obtained at the best-fit point from the MCMC scan allows current LHC Run-II data to exclude wino-like mass-degenerate χ̃1±/χ̃10 up to 565 GeV, with the High-Luminosity LHC projected to reach around 950 GeV for the same branching ratio. In simplified scenarios the exclusion limits are approximately 600 GeV, 1185 GeV, and 1350 GeV for branching ratios of 1%, 50%, and 100% respectively. The analysis demonstrates that the HL-LHC can probe a significant portion of the parameter space still allowed at 1σ by neutrino oscillation data and other constraints.

What carries the argument

Markov Chain Monte Carlo scan of the bilinear R-parity violating SUSY parameter space, with the chargino branching ratio to Z plus lepton serving as the link to LHC trilepton resonance searches.

If this is right

  • The branching ratios for decays to different neutrino and charged lepton flavors depend on the neutrino mass hierarchy.
  • Current LHC data excludes a substantial part of the parameter space consistent with neutrino oscillation data.
  • The High-Luminosity LHC is projected to cover most of the remaining 1σ allowed region for the best-fit branching ratio.
  • Simplified models show that the exclusion reach increases with higher assumed branching ratios to the Z l final state.

Where Pith is reading between the lines

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

  • Refining the neutrino mass hierarchy measurement could narrow the predicted branching ratios and strengthen future collider limits.
  • Similar combined analyses could be performed for other supersymmetry scenarios with R-parity violation to map out their collider signatures.
  • If the wino mass scale remains unconstrained after HL-LHC, it would impact the viability of natural supersymmetry models.

Load-bearing premise

The MCMC scan has converged on parameter regions where the best-fit branching ratio can be applied uniformly to set LHC limits without large variations in the 1σ region.

What would settle it

Detection of a wino-like chargino with mass above 565 GeV decaying to Z plus lepton with a branching ratio near 23 percent, or a measured branching ratio from future data that conflicts with the value required to fit neutrino oscillation results.

read the original abstract

In this work, we explore the bilinear R-parity violating Supersymmetry model's parameter space by performing a Markov Chain Monte Carlo scan with neutrino oscillation data, Higgs mass and its coupling strengths, and flavor observables such as $B$-hadron decay branching ratios. From the allowed parameter space, we analyze the decay patterns of wino-like lighter charginos and lightest neutralinos and demonstrate how the branching ratios to different neutrino and charged lepton flavors depend on the neutrino mass hierarchy. Furthermore, we investigate the impact of current LHC bounds and projected future sensitivities from trilepton resonance searches on the allowed parameter space. We show that considering the branching ratio $\mathrm{Br}(\widetilde{\chi}_1^{\pm} \to Zl^\pm; l= e,\mu,\tau) \sim$23\%, obtained at the best-fit point, the wino-like mass degenerate $\widetilde{\chi}_1^{\pm}/\widetilde{\chi}_1^0$ are excluded upto 565 GeV from LHC Run-II data. The projected exclusion reach with a similar branching ratio at High-Luminosity LHC (HL-LHC) is around 950 GeV. For a simplified scenario where $\widetilde{\chi}_1^{\pm} / \widetilde{\chi}_1^0$ decays via a $Z$ boson with branching ratios of 1\%, 50\%, and 100\%, wino masses can be excluded up to approximately $600~\mathrm{GeV}$, $1185~\mathrm{GeV}$, and $1350~\mathrm{GeV}$ respectively. Our analysis shows that the HL-LHC can probe a significant portion of the 1$\sigma$ allowed parameter space by neutrino oscillation measurements and other experimental constraints.

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 paper performs a Markov Chain Monte Carlo scan of bilinear R-parity violating supersymmetry with a wino-like LSP, subject to neutrino oscillation data, Higgs mass and couplings, and B-hadron flavor observables. From the resulting allowed parameter space it extracts chargino and neutralino decay branching ratios (showing dependence on neutrino mass hierarchy) and recasts LHC trilepton resonance searches using the best-fit value Br(χ̃1± → Zl±; l=e,μ,τ)∼23% to claim Run-II exclusion of the wino-like states up to 565 GeV and a projected HL-LHC reach of 950 GeV. Simplified scenarios with fixed branching ratios of 1%, 50% and 100% are also presented.

Significance. If the MCMC posterior is adequately sampled and the quoted branching ratio is representative of the 1σ region, the work supplies a concrete link between neutrino data and collider limits on RPV SUSY, extending existing wino-mass bounds in a well-motivated corner of parameter space. The explicit use of external neutrino and LHC data without circular fitting is a positive feature.

major comments (1)
  1. [Abstract and LHC recast section] Abstract and the LHC-limits paragraph: the headline exclusions (565 GeV Run-II, 950 GeV HL-LHC) are obtained by inserting the single best-fit branching ratio Br(χ̃1± → Zl±)∼23% into published trilepton limits. No distribution or 1σ range of this branching ratio is reported across the MCMC posterior. Because the same RPV parameters that set the neutrino mixing angles also enter the chargino decay matrix elements, the branching ratio can vary inside the allowed region; without a demonstration that the variation is small, the fixed-Br recast does not map onto the full 1σ parameter space.
minor comments (2)
  1. [Abstract] The abstract states that the scan incorporates 'Higgs mass and its coupling strengths' but does not specify which Higgs observables (signal strengths, total width, etc.) are used or how they are implemented in the likelihood.
  2. [Throughout] Notation for the wino-like states alternates between χ̃1±/χ̃10 and χ̃1±/χ̃1^0; a single consistent symbol set would improve readability.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the careful reading of the manuscript and the constructive comment on the LHC recast section. We address the major comment below and will revise the manuscript accordingly.

read point-by-point responses

  1. Referee: [Abstract and LHC recast section] Abstract and the LHC-limits paragraph: the headline exclusions (565 GeV Run-II, 950 GeV HL-LHC) are obtained by inserting the single best-fit branching ratio Br(χ̃1± → Zl±)∼23% into published trilepton limits. No distribution or 1σ range of this branching ratio is reported across the MCMC posterior. Because the same RPV parameters that set the neutrino mixing angles also enter the chargino decay matrix elements, the branching ratio can vary inside the allowed region; without a demonstration that the variation is small, the fixed-Br recast does not map onto the full 1σ parameter space.

    Authors: We agree with the referee that the branching ratio Br(χ̃1± → Zl±) can in principle vary within the 1σ MCMC posterior because the RPV parameters enter both the neutrino mixing and the decay matrix elements. The current manuscript reports only the value at the best-fit point and does not display the distribution or range across the allowed region. In the revised version we will add a new figure (or table) showing the distribution of this branching ratio for all points inside the 1σ contour. This will quantify the variation and justify the use of the best-fit value (~23%) for the headline exclusions. We will also update the abstract and the relevant LHC-limits paragraph to reference the new distribution and note that the quoted reach applies to the representative best-fit point while the simplified 1%/50%/100% scenarios bracket the possible variation. revision: yes

Circularity Check

0 steps flagged

No circularity; derivation uses external neutrino/Higgs/flavor constraints and published LHC bounds

full rationale

The paper runs an MCMC scan whose inputs are neutrino oscillation data, Higgs mass/couplings, and B-decay observables. From the resulting allowed region it extracts branching ratios at the best-fit point and inserts those fixed values into external trilepton resonance limits to obtain mass exclusions. No equation or step equates the LHC exclusion reach to a quantity defined from the same LHC data; no self-citation supplies a load-bearing uniqueness theorem; the branching ratio is computed from the scan rather than fitted to the target exclusion. The chain therefore remains independent of its final output.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only review; the model inherits the standard supersymmetry Lagrangian plus bilinear RPV terms, with many parameters constrained by the MCMC but no explicit list of free parameters or ad-hoc assumptions provided.

pith-pipeline@v0.9.1-grok · 5854 in / 1295 out tokens · 35346 ms · 2026-06-25T20:02:30.256662+00:00 · methodology

discussion (0)

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