dc.contributor.author Algueró, M dc.contributor.author Cartelle, PA dc.contributor.author Marshall, AM dc.contributor.author Masjuan, P dc.contributor.author Matias, J dc.contributor.author McCann, MA dc.contributor.author Patel, M dc.contributor.author Petridis, KA dc.contributor.author Smith, M dc.date.accessioned 2022-01-04T14:33:24Z dc.date.available 2022-01-04T14:33:24Z dc.date.issued 2021-12-13 dc.date.submitted 2021-07-13 dc.identifier.issn 1029-8479 dc.identifier.other jhep12(2021)085 dc.identifier.other 17356 dc.identifier.uri https://www.repository.cam.ac.uk/handle/1810/331906 dc.description.abstract Abstract In this paper we present a detailed study of the four-body decay B0K+π+, where tensions with the Standard Model predictions have been observed. Our analysis of the decay with P- and S-wave contributions to the K+π system develops a complete understanding of the symmetries of the distribution, in the case of massless and massive leptons. In both cases, the symmetries determine relations between the observables in the B0K+π+ decay distribution. This enables us to define the complete set of observables accessible to experiments, including several that have not previously been identified. The new observables arise when the decay rate is written differentially with respect to $${m}_{K_{\pi }}$$ m K π . We demonstrate that experiments will be able to fit this full decay distribution with currently available data sets and investigate the sensitivity to new physics scenarios given the experimental precision that is expected in the future.The symmetry relations provide a unique handle to explore the behaviour of S-wave observables by expressing them in terms of P-wave observables, therefore minimising the dependence on poorly-known S-wave form factors. Using this approach, we construct two theoretically optimized S-wave observables and explore their sensitivity to new physics. By further exploiting the symmetry relations, we obtain the first bounds on the S-wave observables using two different methods and highlight how these relations may be used as cross-checks of the experimental methodology and the parametrization of the B0K+π+ differential decay rate. We identify a zero-crossing point that would be at a common dilepton invariant mass for a subset of P- and S-wave observables, and explore the information on new physics and hadronic effects that this zero point can provide. dc.language en dc.publisher Springer Science and Business Media LLC dc.subject Regular Article - Theoretical Physics dc.subject Effective Field Theories dc.subject Heavy Quark Physics dc.title A complete description of P- and S-wave contributions to the B 0 → K + π + decay dc.type Article dc.date.updated 2022-01-04T14:33:24Z prism.issueIdentifier 12 prism.publicationName Journal of High Energy Physics prism.volume 2021 dc.identifier.doi 10.17863/CAM.79356 dcterms.dateAccepted 2021-11-20 rioxxterms.versionofrecord 10.1007/JHEP12(2021)085 rioxxterms.version VoR rioxxterms.licenseref.uri http://creativecommons.org/licenses/by/4.0/ dc.contributor.orcid Algueró, M [0000-0001-7519-3845] dc.identifier.eissn 1029-8479 cam.issuedOnline 2021-12-13 dc.identifier.arxiv 2107.05301
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