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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Z(c)(4430) and Z(c)(4200) as triangle singularities

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Autor(es):
Nakamura, S. X. [1, 2, 3] ; Tsushima, K. [3]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Sci & Technol China, Hefei 230026, Anhui - Peoples R China
[2] State Key Lab Particle Detect & Elect IHEP USTC, Hefei 230036, Anhui - Peoples R China
[3] Univ Cidade Sao Paulo, Univ Cruzeiro Sul, LFTC, BR-01506000 Sao Paulo, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Physical Review D; v. 100, n. 5 SEP 9 2019.
Citações Web of Science: 0
Resumo

Z(c)(4430) discovered by the Belle Collaboration and confirmed by the LHCb Collaboration in (B) over bar (0) -> psi(2S)K-pi(+) is generally considered to be a charged charmoniumlike state that includes minimally two quarks and two antiquarks. Z(c)(4200) found in (B) over bar (0) -> J/psi K-pi(+) by Belle is also a good candidate of a charged charmoniumlike state. In this work, we propose a compelling alternative to the tetraquark-based interpretations of Z(c)(4430) and Z(c)(4200). We demonstrate that kinematical singularities in triangle loop diagrams induce a resonancelike behavior that can consistently explain the properties (spin parity, mass, width, and Argand plot) of Z(c)(4430) and Z(c)(4200) from the experimental analyses. Applying this idea to Lambda(0)( )(b)-> J/psi p pi(-),we also identify triangle singularities that behave like Z(c)(4200), but no triangle diagram is available for Z(c)(4430). This is consistent with LHCb's finding that their description of the Lambda(0)(b) -> J/psi p pi(-) data is significantly improved by including a Z(c)(4200) contribution while Z(c)(4430) seems to hardly contribute. Even though the proposed mechanisms have uncertainty in the absolute strengths which are currently difficult to estimate, otherwise the results are essentially determined by the kinematical effects and, thus, robust. (AU)

Processo FAPESP: 16/15618-8 - Análise de Tau e pesados méson hadrônicas decaimentos e neutrino-núcleo interações, para estruturas e interações hadron, e física além do modelo padrão
Beneficiário:Kazuo Tsushima
Linha de fomento: Auxílio à Pesquisa - Pesquisador Visitante - Internacional
Processo FAPESP: 17/05660-0 - Estudos teóricos da estrutura e reações de núcleos exóticos e sistemas de muitos corpos
Beneficiário:Brett Vern Carlson
Linha de fomento: Auxílio à Pesquisa - Temático