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Analysis of Tau and heavy meson hadronic decays and neutrino-nucleus interactions, for hadron structures and interactions, and physics beyond the standard model

Grant number: 16/15618-8
Support type:Research Grants - Visiting Researcher Grant - International
Duration: May 01, 2017 - May 29, 2018
Field of knowledge:Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields
Principal researcher:Kazuo Tsushima
Grantee:Kazuo Tsushima
Visiting researcher: Satoshi Nakamura
Visiting researcher institution: Osaka University, Japan
Home Institution: Pró-Reitoria de Pós-Graduação e Pesquisa. Universidade Cruzeiro do Sul (UNICSUL). São Paulo , SP, Brazil


The project is to analyze current and/or forthcoming data from world-class experiments to extract hadron structures and interactions, and to search for physics beyond the standard model (BSM). The project is separated into three parts, Project A, B, C, depending on processes to be analyzed. Project A is to analyze data for hadronic tau decays into one, two, and three light mesons (pi, K, etc.) in a combined manner. A model used in the analysis consists of the light front constituent quark (LFCQ) model for hadronizations of the currents, and a phenomenological hadron interaction model for the hadronic final state interactions. Two- and three-meson scatterings are treated on the same footing by solving the scattering equations including the same hadron interactions; both two- and three-body unitarily are maintained. The analysis will provide the quark structures of hadrons, the hadron interactions, and resonance parameters for axial-vector mesons. Project B is to analyze CP violating (CPV) hadronic tau decays and also B and D decays toward a discovery of BSM physics. For this purpose, we extend the model developed in Project A to a unique analysis tool with favorable features. We conduct a preliminary study of CPV hadronic tau decays. Also, we analyze CPV data for B to D0x h decay (D0x=D0,D0-bar,h=pi, K) followed by D0x decay into three light mesons, determining one of the angles of the unitarily triangle, gamma. Finally Project C is to develop a neutrino-nucleus reaction model for the resonance region that will be crucially important in analyzing data from neutrino oscillation experiments where CPV in the lepton sector is searched for. We also improve the elementary single nucleon reaction amplitudes used in the model. (AU)

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Scientific publications (6)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
NAKAMURA, S. X.; TSUSHIMA, K. Z(c)(4430) and Z(c)(4200) as triangle singularities. Physical Review D, v. 100, n. 5 SEP 9 2019. Web of Science Citations: 0.
NAKAMURA, S. X.; KAMANO, H.; SATO, T. Impact of final state interactions on neutrino-nucleon pion production cross sections extracted from neutrino-deuteron reaction data. Physical Review D, v. 99, n. 3 FEB 20 2019. Web of Science Citations: 3.
SOBCZYK, J. E.; HERNANDEZ, E.; NAKAMURA, S. X.; NIEVES, J.; SATO, T. Angular distributions in electroweak pion production off nucleons: Odd parity hadron terms, strong relative phases, and model dependence. Physical Review D, v. 98, n. 7 OCT 5 2018. Web of Science Citations: 7.
NAKAMURA, SATOSHI X. Extraction of gamma n -> pi N observables from deuteron-target data. Physical Review C, v. 98, n. 4 OCT 2 2018. Web of Science Citations: 4.
NAKAMURA, SATOSHI X. Photo- and Electro-excitation of Bound Neutrons and Protons. FEW-BODY SYSTEMS, v. 59, n. 5 SEP 2018. Web of Science Citations: 0.
NAKAMURA, S. X.; KAMANO, H.; ISHIKAWA, T. Low-energy eta-nucleon interaction studied with eta photoproduction off the deuteron. Physical Review C, v. 96, n. 4 OCT 26 2017. Web of Science Citations: 8.

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