{"artifact_id":"L1-484","layer":"L1","title":"Charged Particle Track Reconstruction","domain":"Particle Physics","sub_domain":"Tracking detectors","physics_fingerprint":{"L_DAG":4.0,"title":"Charged Particle Track Reconstruction","domain":"Particle Physics","carrier":"particle","primitives":["S.kalman.track_filter","D.time","O.chi2.hit_residuals"],"sub_domain":"Tracking detectors","noise_model":"gaussian","problem_class":"nonlinear_inverse","solution_space":"track_parameter_vector","difficulty_delta":5,"integration_axis":"track_helix","sensing_mechanism":"silicon_tracker_hit_pattern"},"observable_profile":{"metric":"track_parameter_resolution_sigma_pt_over_pt","regime":"Existence of the recovered track_parameter_vector is guaranteed within the declared Omega bounds. Uniqueness holds on the measurement-supported subspace; out-of-support modes are controlled by declared priors. Stability is conditionally stable (kappa_eff ~= 200); alignment_uncertainty_um dominates the stability cliff; the remaining mismatch parameters contribute higher-order bias terms. Gaussian sets the irreducible data-fidelity floor.","secondary":"tracking_efficiency_percent"},"size_tiers":{"center_spec":{"omega":{"N_layers":10,"B_field_T":2.0,"pileup_mu":50,"material_X0_percent":0.5},"input_format":"measurement_only","problem_class":"nonlinear_inverse","forward_operator":"silicon_tracker_hit_pattern","epsilon_fn_center":"0.001 track_parameter_resolution_sigma_pt_over_pt"},"omega_bounds":{"N_layers":[4,20],"B_field_T":[0.5,4.0],"pileup_mu":[0,200],"material_X0_percent":[0.1,3.0]},"epsilon_bounds":{"track_parameter_resolution_sigma_pt_over_pt":[0.0001,0.01]},"allowed_problem_classes":["nonlinear_inverse"],"allowed_omega_dimensions":["N_layers","B_field_T","material_X0_percent","pileup_mu"],"allowed_forward_operators":["silicon_tracker_hit_pattern"]},"hardness_fn":{"type":"epsilon_fn","delta":5,"kappa":10000.0,"metric":"track_parameter_resolution_sigma_pt_over_pt"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0x751db39c2e389f94308495e5a28df961aff9eed62bff526231f292a7ead5f943","chain_tx_hash":"0x0a900f5a04283e365f732dcd071354524a5e14b22bd4fec638f3257acdf17f3b","chain_block":41555317}