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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.)

Scalar resonances in a unitary pi pi S-wave model for D+->pi(+)pi(-)pi(+)

Texto completo
Autor(es):
Boito, D. R. [1, 2, 3] ; Dedonder, J-P. [4, 5] ; El-Bennich, B. [6, 4, 5] ; Leitner, O. [7, 4, 5] ; Loiseau, B. [4, 5]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo - Brazil
[2] Univ Autonoma Barcelona, IFAE, E-08193 Barcelona - Spain
[3] Univ Autonoma Barcelona, Fis Teor Grp, E-08193 Barcelona - Spain
[4] Univ Paris 06, Grp Theorie, Lab Phys Nucl & Hautes Energies, CNRS, IN2P3, F-75252 Paris - France
[5] Univ Paris 07, Grp Theorie, Lab Phys Nucl & Hautes Energies, CNRS, IN2P3, F-75252 Paris - France
[6] Argonne Natl Lab, Div Phys, Argonne, IL 60439 - USA
[7] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati - Italy
Número total de Afiliações: 7
Tipo de documento: Artigo Científico
Fonte: Physical Review D; v. 79, n. 3 FEB 2009.
Citações Web of Science: 9
Resumo

We propose a model for D+->pi(+)pi(-)pi(+) decays following experimental results which indicate that the two-pion interaction in the S wave is dominated by the scalar resonances f(0)(600)/sigma and f(0)(980). The weak decay amplitude for D+-> R pi(+), where R is a resonance that subsequently decays into pi(+)pi(-), is constructed in a factorization approach. In the S wave, we implement the strong decay R ->pi(+)pi(-) by means of a scalar form factor. This provides a unitary description of the pion-pion interaction in the entire kinematically allowed mass range m(pi pi)(2) from threshold to about 3 GeV2. In order to reproduce the experimental Dalitz plot for D+->pi(+)pi(-)pi(+), we include contributions beyond the S wave. For the P wave, dominated by the rho(770)(0), we use a Breit-Wigner description. Higher waves are accounted for by using the usual isobar prescription for the f(2)(1270) and rho(1450)(0). The major achievement is a good reproduction of the experimental m(pi pi)(2) distribution, and of the partial as well as the total D+->pi(+)pi(-)pi(+) branching ratios. Our values are generally smaller than the experimental ones. We discuss this shortcoming and, as a by-product, we predict a value for the poorly known D ->sigma transition form factor at q(2)=m pi(2). (AU)

Processo FAPESP: 04/11154-0 - Decaimentos de mésons d em três píons
Beneficiário:Diogo Rodrigues Boito
Linha de fomento: Bolsas no Brasil - Mestrado
Processo FAPESP: 06/50343-8 - Estudo fenomenológico das reações com quarks pesados
Beneficiário:Joao Pacheco Bicudo Cabral de Mello
Linha de fomento: Auxílio à Pesquisa - Regular