{"paper":{"title":"Using an amplitude analysis to measure the photon polarisation in $B \\to K\\pi\\pi\\gamma$ decays","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Albert Puig Navarro, Fr\\'ed\\'eric Blanc, Giovanni Veneziano, Karim Trabelsi, Olivier Schneider, Preema Pais, Violaine Bell\\'ee","submitted_at":"2019-02-25T11:29:12Z","abstract_excerpt":"A method is proposed to measure the photon polarisation parameter $\\lambda_\\gamma$ in $b\\to s\\gamma$ transitions using an amplitude analysis of $B\\to K\\pi\\pi\\gamma$ decays. Simplified models of the $K\\pi\\pi$ i system are used to simulate $B^+ \\to K^+\\pi^-\\pi^+\\gamma$ and $B^0\\to K^+\\pi^-\\pi^0$ decays, validate the amplitude analysis method, and demonstrate the feasibility of a measurement of the $\\lambda_\\gamma$ parameter irrespective of the model parameters. Similar sensitivities to $\\lambda_\\gamma$ are obtained with both the charged and neutral hadronic systems. In the absence of any backgro"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.09201","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1902.09201/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}