RT Journal Article
T1 Note on the definitions of branching ratios of overlapping resonances
A1 Burkert, V.
A1 Crede, V.
A1 Klempt, E.
A1 Nikonov, K.V.
A1 Oller, J.A.
A1 Peláez Sagredo, José Ramón
A1 Ruiz De Elvira Carrascal, Jacobo
A1 Sarantsev, A.
A1 Tiator, L.
A1 Thoma, U.
A1 Workman, R.
AB Branching ratios for the decay of hadrons with large width or near thresholds depend on their definition. We test different definitions and show that rather different branching ratios can be obtained. For wide resonances and for sequential decays with wide intermediate resonances, integration over the spectral functions is mandatory. The tests are performed exploiting the latest solution of the Bonn-Gatchina multichannel analysis and published values for residues of light scalar mesons. For a resonance overlapping with a threshold, in case its pole lies in a non-adjacent sheet, we show how the total width, needed for the branching ratios, does not correspond to the imaginary part of the pole position. We use the Madrid-Krakow dispersive parameterizations to illustrate this situation with the f_0(980).
PB Elsevier
SN 0370-2693
YR 2023
FD 2023-09-10
LK https://hdl.handle.net/20.500.14352/102232
UL https://hdl.handle.net/20.500.14352/102232
LA eng
NO 2023 Descuento SCOAP
NO National Natural Science Foundation of China
NO German Research Foundation
NO Ministry of Culture and Science of the State of Northrhine Westphalia
NO United States Department of Energy
NO Ministerio de Ciencia e Innovación (España)
NO Ministerio de Economia y Competitividad (España)
NO Unión Europea. H2020
DS Docta Complutense
RD 10 abr 2025