# ============================================================================ # P05 — ALP EFT $E_T^\mathrm{miss}$ distribution in $pp \to a W^\pm \gamma$ # ---------------------------------------------------------------------------- # Adapts ColliderAgent paper-reproduction prompt: # /home/shiqiu/ColliderAgent/paper-reproduction/1701.05379/prompt_figure_8.md # Source: arXiv:1701.05379 — bosonic ALP EFT at the LHC, MET shape in # $pp \to a W^\pm \gamma$ as a probe of $c_{\tilde W}$ (with photophobic # choice $c_{\tilde B} = -\tan^2\theta_W \cdot c_{\tilde W}$). # ============================================================================ 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 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, $|\eta^{\gamma,\ell}| < 2.5$. 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?* 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 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 rubric_path: "experiments/arc_bench/config/physics/rubrics/P05.json" # --------------------------------------------------------------------------- # Agent-mode requirements (consumed by researchclaw.pipeline.requirements_judge # at stage 15 RESEARCH_DECISION). Schema mirrors B01.yaml: # id — stable identifier # type — advisory hint to the LLM judge (numeric | artifact | discussion) # description — natural-language statement of what must be true post-run # must_pass — true → unmet ⇒ rerun (1 retry max); false → optional # # The five generic must_pass items apply uniformly across P01-P10; the sixth # is topic-specific (mirrors this manifest's H1). The two must_pass=false # items reward mechanistic interpretation and MC-reproducibility metadata # without blocking proceed-vs-rerun on them. # --------------------------------------------------------------------------- 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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