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| id: P05 |
| title: "Reproducing the normalized $E_T^\\mathrm{miss}$ shape in $pp \\to a W^\\pm \\gamma$ from a photophobic ALP EFT" |
| arxiv_id: "1701.05379" |
| venue: "ARC-Bench Physics 2026" |
| paper_asset: null |
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| synthesis: | |
| Reproducing the normalized $E_T^\mathrm{miss}$ distribution for the |
| process $pp \to a W^\pm (\to \ell^\pm \nu)\, \gamma$ at $\sqrt{s}=13$ |
| TeV in the bosonic ALP EFT, as a benchmark of the agent's ability to |
| handle a higher-dimensional EFT operator and parton-level missing-energy |
| reconstruction. The Lagrangian is |
| $\delta\mathcal{L}_a = c_{\tilde W} \mathcal{A}_{\tilde W} + |
| c_{\tilde B} \mathcal{A}_{\tilde B}$ with the photophobic constraint |
| $c_{\tilde B} = -\tan^2\theta_W \cdot c_{\tilde W}$ (so the |
| $a\gamma\gamma$ coupling vanishes), giving a single free Wilson |
| coefficient $c_{\tilde W}$. The diagnostic observable is the |
| normalized parton-level $E_T^\mathrm{miss} = |\vec p_T^{\,a} + |
| \vec p_T^{\,\nu}|$ shape in 50 bins over [0, 1000] GeV, with |
| generation cuts $p_T^{\gamma,\ell} > 20$ GeV, $|\eta^{\gamma,\ell}| < 2.5$. |
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| A credible study (a) implements the photophobic ALP EFT (FeynRules |
| bosonic operators with $c_{\tilde B} = -\tan^2\theta_W \cdot c_{\tilde W}$), |
| (b) generates 500k LHE events at $f_a = 1000$ GeV, $m_a = 0.001$ GeV, |
| $c_{\tilde W} = 1$ with the nn23lo1 PDF, (c) sums $\vec p_T^{\,a}$ + |
| $\vec p_T^{\,\nu}$ from invisible final-state particles to reconstruct |
| $E_T^\mathrm{miss}$, and (d) plots the normalized histogram on log-y |
| $[10^{-4}, 1]$ over [0, 1000] GeV. Research question: *does the agent |
| reproduce the falling-then-flattening MET shape characteristic of a |
| derivative ALP coupling versus the steeply falling SM-like baseline, |
| matching Figure 8 of arXiv:1701.05379?* |
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| hypotheses: |
| - id: H1 |
| statement: "The peak of the normalized $E_T^\\mathrm{miss}$ distribution lies in the bin range $[100, 250]$ GeV, consistent with the published shape." |
| measurable: true |
| - id: H2 |
| statement: "The integrated normalized fraction of events with $E_T^\\mathrm{miss} > 500$ GeV is in $[0.05, 0.30]$ at $c_{\\tilde W}=1$, $f_a=1$ TeV (long high-MET tail from the derivative ALP coupling)." |
| measurable: true |
| - id: H3 |
| statement: "Acceptance after the published photon and lepton cuts ($p_T > 20$ GeV, $|\\eta| < 2.5$) is $\\geq 50\\%$ of generated events." |
| measurable: true |
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| experiment_design: |
| research_question: "Does the agent reproduce the parton-level $E_T^\\mathrm{miss}$ shape for $pp \\to a W^\\pm \\gamma$, $W \\to \\ell\\nu$ at $\\sqrt{s}=13$ TeV under the photophobic ALP EFT (Figure 8 of arXiv:1701.05379)?" |
| conditions: |
| - name: "alp_cw1_fa1tev" |
| description: "Bosonic ALP EFT at $c_{\\tilde W}=1$, $c_{\\tilde B}=-\\tan^2\\theta_W$, $f_a=1000$ GeV, $m_a=0.001$ GeV, 500k events at $\\sqrt{s}=13$ TeV with nn23lo1 PDF." |
| - name: "alp_cw_variant" |
| description: "Sanity-check run at $c_{\\tilde W}=2$, $f_a=1000$ GeV; cross section should scale as $c_{\\tilde W}^2$ but normalized shape should be invariant." |
| baselines: |
| - "Shape-only normalization is its own baseline: deviation between $c_{\\tilde W}=1$ and $c_{\\tilde W}=2$ shapes should be statistical only" |
| metrics: |
| - name: "etmiss_peak_position_gev" |
| direction: "match_reference" |
| description: "$E_T^\\mathrm{miss}$ bin center of the peak of the normalized histogram." |
| - name: "high_metmiss_tail_fraction" |
| direction: "match_reference" |
| description: "Fraction of normalized events with $E_T^\\mathrm{miss} > 500$ GeV." |
| - name: "cut_acceptance" |
| direction: "match_reference" |
| description: "Acceptance fraction after photon + lepton fiducial cuts." |
| datasets: |
| - process_id: "pp_to_aWgamma_Wlnu" |
| sqrt_s_TeV: 13 |
| description: "Parton-level $pp \\to a W^\\pm \\gamma$ with $W \\to \\ell\\nu$ in the photophobic ALP EFT." |
| compute_requirements: |
| gpu_required: false |
| estimated_wall_clock_sec: 3600 |
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| rubric_path: "experiments/arc_bench/config/physics/rubrics/P05.json" |
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| requirements: |
| - id: req_results_json |
| type: artifact |
| description: >- |
| A canonical results.json file exists at the workspace root with at least |
| the keys: primary_metric (number), metric_key (string), metrics (object |
| with numeric keys), hypotheses (object with h1/h2/h3 entries each |
| carrying a `supported` boolean), summary (non-empty string). |
| must_pass: true |
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|
| - id: req_metrics_numeric |
| type: numeric |
| description: >- |
| results.json metrics MUST contain at least 3 numeric (non-null, finite) |
| values directly relevant to the headline physics observable named in |
| the experiment_design.metrics list above — these are the numbers the |
| paper will report in its Results section. |
| must_pass: true |
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| - id: req_hypotheses_supported_flags |
| type: discussion |
| description: >- |
| results.json hypotheses.h1/h2/h3 each MUST have an explicit `supported` |
| boolean AND a `details` string ≥ 40 characters quoting the numerical |
| evidence (specific values + their source artifact) used to reach the |
| verdict. |
| must_pass: true |
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| - id: req_publication_figure |
| type: artifact |
| description: >- |
| At least one publication-quality figure file (PDF or PNG, ≥150 DPI for |
| raster) exists under figures/ or output/figures/ with axes labeled in |
| physical units (GeV / pb / fb / dimensionless) and a legend if multiple |
| series are plotted. The figure must directly support a hypothesis |
| verdict. |
| must_pass: true |
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| - id: req_model_implementation |
| type: artifact |
| description: >- |
| The BSM Lagrangian is implemented either as a FeynRules .fr file |
| (models/*.fr) with a matching UFO directory (models/*_UFO/ containing |
| at least particles.py, parameters.py, couplings.py, vertices.py), OR |
| as analytic Python code that explicitly computes the cross sections |
| from the Lagrangian terms. A pure SM baseline with no BSM piece is |
| NOT sufficient. |
| must_pass: true |
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| - id: req_met_peak_bin |
| type: numeric |
| description: >- |
| results.json metrics MUST report the peak bin of the normalized E_T^miss distribution; the bin center must lie in [100, 250] GeV and the distribution must integrate to 1.0 (normalized). |
| must_pass: true |
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| - id: req_mechanistic_writeup |
| type: discussion |
| description: >- |
| The summary or structured_results section provides a one-paragraph |
| mechanistic interpretation of WHY the headline observable comes out the |
| way it does (which interference / propagator structure / cut effect |
| drives the result). Nice-to-have, not blocking proceed. |
| must_pass: false |
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| - id: req_mc_reproducibility |
| type: discussion |
| description: >- |
| results.json or a sibling reproducibility section names: (a) the |
| MadGraph5_aMC@NLO version, (b) the PDF set used (if applicable), (c) |
| at least one explicit random seed. Required for full reproducibility |
| but not for scientific correctness. |
| must_pass: false |
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