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 Opportunities: Research Grants - Visiting Researcher Grant - International
• Start date: May 01, 2017
• End date: May 29, 2018
• Field of knowledge: Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields
• Principal Investigator: Kazuo Tsushima
• Grantee: Kazuo Tsushima
• Visiting researcher: Satoshi Nakamura
• Visiting researcher institution: Osaka University/Ou , Japan
• Host Institution: Pró-Reitoria de Pós-Graduação e Pesquisa. Universidade Cruzeiro do Sul (UNICSUL). São Paulo , SP, Brazil
• City of the host institution: São Paulo

Abstract

The project is to analyze current and/or forthcoming data from world-class experimentsto 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, dependingon 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 thecurrents, and a phenomenological hadron interaction model for the hadronic final stateinteractions. Two- and three-meson scatterings are treated on the same footing by solvingthe scattering equations including the same hadron interactions; both two- and three-body unitarity are maintained. The analysis will provide the quark structures of hadrons,the hadron interactions, and resonance parameters for axial-vector mesons. Project B isto analyze CP violating (CPV) hadronic tau decays and also B and D decays toward adiscovery of BSM physics. For this purpose, we extend the model developed in Project Ato a unique analysis tool with favorable features. We conduct a preliminary study of CPVhadronic 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 unitarity 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 neutrinooscillation experiments where CPV in the lepton sector is searched for. We also improvethe elementary single nucleon reaction amplitudes used in the model. (AU)

Scientific publications

(11)

(The scientific publications listed on this page originate from the Web of Science or SciELO databases. Their authors have cited FAPESP grant or fellowship project numbers awarded to Principal Investigators or Fellowship Recipients, whether or not they are among the authors. This information is collected automatically and retrieved directly from those bibliometric databases.)

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. (16/15618-8)

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, p. 39-pg., 2018-10-05. (16/15618-8)

NAKAMURA, S. X.; TSUSHIMA, K.. Z(c)(4430) and Z(c)(4200) as triangle singularities. PHYSICAL REVIEW D, v. 100, n. 5, p. 6-pg., 2019-09-09. (17/05660-0, 16/15618-8)

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, p. 6-pg., 2017-10-26. (16/15618-8)

NAKAMURA, SATOSHI X.. Extraction of gamma n -> pi N observables from deuteron-target data. PHYSICAL REVIEW C, v. 98, n. 4, p. 6-pg., 2018-10-02. (16/15618-8)

NAKAMURA, SATOSHI X.. Photo- and Electro-excitation of Bound Neutrons and Protons. FEW-BODY SYSTEMS, v. 59, n. 5, SEP 2018. (16/15618-8)

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. (16/15618-8)

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. (16/15618-8, 17/05660-0)

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. (16/15618-8)

NAKAMURA, SATOSHI X.. Extraction of gamma n -> pi N observables from deuteron-target data. Physical Review C, v. 98, n. 4, OCT 2 2018. (16/15618-8)

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, p. 6-pg., 2019-02-20. (16/15618-8)