{"paper":{"title":"Probing new physics with the kaon decays $K\\to\\pi\\pi\\!\\not\\!\\!E$","arxiv_id":"2009.00608","primary_cat":"hep-ph","submitted_at":"2020-09-01T17:58:04+00:00","version_compiled":"v3"},"notice":"Every quoted sentence is the authors' text from the arXiv listing abstract. Labels and probabilities are the outputs of classifier-1.13.0 on the question bank abstract-p1-20260923, exactly as returned. No sentence in this record was written by a language model.","schema":"pith.compiled-record/v0","status":"compiled","abstract":{"source":"arXiv listing abstract v3","sentences":[{"i":0,"p":0.96,"id":"s0","own":false,"role":"background","text":"The latest search for the rare kaon decay $K^+\\to\\pi^+\\nu\\bar\\nu$ by the NA62 experiment has produced evidence for it with a branching fraction consistent with the prediction of the standard model.","hedge":{"p":0.6,"label":"asserted"},"own_p":0.06,"main_claim_p":0.05,"quantitative":false,"quantitative_p":0.48,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.04,"background":0.96,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.0}},{"i":1,"p":0.78,"id":"s1","own":false,"role":"interpretation","text":"The new result implies that in this decay, with the $\\nu\\bar\\nu$ pair appearing as missing energy ($\\not\\!\\!E$), the room for possible new physics is no longer sizable and that therefore its contributions to underlying four-particle $s\\to d\\!\\not\\!\\!E$ operators with parity-even $ds$ quark bilinears have become significantly constrained.","hedge":{"p":0.6,"label":"asserted"},"own_p":0.16,"main_claim_p":0.21,"quantitative":false,"quantitative_p":0.28,"role_probabilities":{"gap":0.01,"method":0.0,"result":0.02,"background":0.19,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.78}},{"i":2,"p":0.74,"id":"s2","own":false,"role":"gap","text":"Nevertheless, we point out that appreciable manifestations from beyond the standard model induced by the corresponding operators with mainly parity-odd $ds$ quark bilinears could still occur in $K\\to\\pi\\pi\\!\\not\\!\\!E$ modes, on which there are only minimal empirical details at present.","hedge":{"p":0.99,"label":"hedged_possibility"},"own_p":0.31,"main_claim_p":0.43,"quantitative":false,"quantitative_p":0.13,"role_probabilities":{"gap":0.74,"method":0.0,"result":0.03,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.16,"interpretation":0.07}},{"i":3,"p":0.98,"id":"s3","own":true,"role":"result","text":"We find in particular that new physics of this kind may enhance the branching fraction of $K_L\\to\\pi^0\\pi^0\\!\\not\\!\\!E$ to values reaching its current experimental upper limit and the branching fractions of $K^+\\to\\pi^+\\pi^0\\!\\not\\!\\!E$ and $K_L\\to\\pi^+\\pi^-\\!\\not\\!\\!E$ to the levels of $10^{-7}$ and $10^{-6}$, respectively.","hedge":{"p":0.89,"label":"hedged_possibility"},"own_p":0.92,"main_claim_p":0.36,"quantitative":true,"quantitative_p":0.99,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.98,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.01,"interpretation":0.01}},{"i":4,"p":0.93,"id":"s4","own":false,"role":"future_work","text":"Thus, quests for these decays in existing kaon facilities such as KOTO and NA62 or future ones could provide valuable information complementary to that gained from $K\\to\\pi\\!\\not\\!\\!E$.","hedge":{"p":0.95,"label":"hedged_possibility"},"own_p":0.18,"main_claim_p":0.23,"quantitative":false,"quantitative_p":0.17,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.0,"background":0.0,"limitation":0.0,"future_work":0.93,"contribution":0.0,"interpretation":0.07}}]},"compiled":{"main_claim":{"p":0.83,"text":"Nevertheless, we point out that appreciable manifestations from beyond the standard model induced by the corresponding operators with mainly parity-odd $ds$ quark bilinears could still occur in $K\\to\\pi\\pi\\!\\not\\!\\!E$ modes, on which there are only minimal empirical details at present.","location":"abstract s2","hedge_strength":{"p":0.99,"label":"hedged possibility"}},"provenance":{"route":{"via":"TypeSafe API","model":"classifier-1.13.0","endpoint":"https://api.typesafe.ai/v1/systemone","provider":"TypeSafe"},"packing":"one request per 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the branching fraction of $K_L\\to\\pi^0\\pi^0\\!\\not\\!\\!E$ to values reaching its current experimental upper limit and the branching fractions of $K^+\\to\\pi^+\\pi^0\\!\\not\\!\\!E$ and $K_L\\to\\pi^+\\pi^-\\!\\not\\!\\!E$ to the levels of $10^{-7}$ and $10^{-6}$, respectively.","location":"abstract s3"}},"coverage":{"tier":"abstract","levels_run":["P abstract"],"not_examined":["full text","figures and tables","references and citing sentences","relations to other papers"],"sources_read":["arXiv listing abstract v3"],"levels_not_run":["S sections","T body sentences","C citations","R cross-paper relations"],"sentences_examined":5,"sentences_in_abstract":5},"measured_accuracy":{"url":"https://pith.science/accuracy","measured_on":"2026-10-02","method":"two independent model families labelled a fresh random sample blind; the figure is how often the published label matches their 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