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First Measurement of the B^{+}→π^{+}π^{0}π^{0} Branching Fraction and CP Asymmetry.

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Physical Review Letters, 01 May 2023, 130(18):181804
https://doi.org/10.1103/physrevlett.130.181804 PMID: 37204904 

Abstract 

We study B^{+}→π^{+}π^{0}π^{0} using 711  fb^{-1} of data collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. We measure an inclusive branching fraction of (19.0±1.5±1.4)×10^{-6} and an inclusive CP asymmetry of (9.2±6.8±0.7)%, where the first uncertainties are statistical and the second are systematic, and a B^{+}→ρ(770)^{+}π^{0} branching fraction of (11.2±1.1±0.9_{-1.6}^{+0.8})×10^{-6}, where the third uncertainty is due to possible interference with B^{+}→ρ(1450)^{+}π^{0}. We present the first observation of a structure around 1  GeV/c^{2} in the π^{0}π^{0} mass spectrum, with a significance of 6.4σ, and measure a branching fraction to be (6.9±0.9±0.6)×10^{-6}. We also report a measurement of local CP asymmetry in this structure.

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Read article at publisher's site: https://doi.org/10.1103/physrevlett.130.181804

Read article for free, from open access legal sources, via Unpaywall: http://link.aps.org/pdf/10.1103/PhysRevLett.130.181804Unpaywall

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Funding 

Funders who supported this work.

Australian Research Council (6)

Austrian Science Fund FWF (1)

Bundesministerium für Bildung, Wissenschaft und Forschung

    Carl-Zeiss-Stiftung

      Department of Atomic Energy, Government of India (1)

      Department of Science and Technology, Ministry of Science and Technology, India

        Deutsche Forschungsgemeinschaft

          Environmental Molecular Sciences Laboratory

            European Research Council (1)

            Excellence Cluster Universe

              Foreign Large-size Research Facility Application

                GLORIAD

                  Grantová Agentura České Republiky (1)

                  Horizon 2020 Framework Programme (1)

                  Ikerbasque, Basque Foundation for Science

                    Istituto Nazionale di Fisica Nucleare Sezione di Padova

                      Japan Society for the Promotion of Science

                        Javna Agencija za Raziskovalno Dejavnost RS (2)

                        Kavli Institute for the Physics and Mathematics of the Universe

                          Key Research Program of Frontier Science, Chinese Academy of Sciences (1)

                          Korea Institute of Science and Technology Information

                            Korea Research Environment Open Network

                              Ministerstvo Školství, Mládeže a Tělovýchovy (1)

                              Ministerstwo Edukacji i Nauki

                                Ministry of Education

                                  Ministry of Education, Culture, Sports, Science and Technology

                                    Ministry of Science and Higher Education of the Russian Federation (1)

                                    Ministry of Science and Technology, Taiwan

                                      Nagoya University

                                        National Institute of Informatics

                                          National Natural Science Foundation of China (6)

                                          National Research Foundation of Korea (9)

                                          National Research University Higher School of Economics

                                            National Science Center

                                              National Science Foundation

                                                Natural Science Foundation of Shandong Province (1)

                                                Pacific Northwest National Laboratory

                                                  Radiation Science Research Institute

                                                    Science Information NETwork 6

                                                      Swiss National Science Foundation

                                                        U.S. Department of Energy

                                                          University of Tabuk (3)

                                                          University of Tokyo

                                                            Volkswagen Foundation

                                                              World Premier International Research Center Initiative