Hyperon resonances coupled to pseudoscalar- and vector-baryon channels

Autor(es)

Khemchandani, K. P. ; Martinez Torres, A. ; Oller, J. A.

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW C; v. 100, n. 1, p. 16-pg., 2019-07-29.

Resumo

We study hyperon resonances by solving coupled channel scattering equations. The coupled systems include pseudoscalar- and vector-baryon channels. The parameters of the model are restricted by making a chi(2)-fit to the cross-section data on processes: K- p -> K- p, K- p -> (K) over bar (0)n, K- p -> eta Lambda, K- p -> pi(0 Lambda), K- p -> pi(0)Sigma(0), K- p -> pi(+/-)Sigma(+/-). Data on the energy-level shift and width of the 1s state of the kaonic hydrogen, as well as some cross-section ratios near the threshold are also considered in the fit. Two types of fit are found as a result. In both cases, the properties of Lambda(1405) are well reproduced. In addition to this, a Sigma state is also found with mass around 1400 MeV. Cross sections, obtained with one of the two fits, are found to stay close to the data at energies away from the thresholds too, and as a result resonances with higher masses have also been studied. (AU)

• Processo FAPESP: 12/50984-4 - Física de hádrons
• Beneficiário: Fernando Silveira Navarra
• Modalidade de apoio: Auxílio à Pesquisa - Temático