Abstract

Resonances are uniquely characterized by their complex pole locations and the corresponding residues. In practice, however, resonances are typically identified experimentally as structures in invariant mass distributions, with branching fractions of resonances determined as ratios of count rates. To make contact between these quantities it is necessary to connect line shapes and resonance parameters. In this work we propose such a connection and illustrate the formalism with detailed studies of the ρ(770) and f0(500) resonances. Based on the line shapes inferred from the resonance parameters along these lines, expressions for partial widths and branching ratios are derived and compared to other approaches in the literature.

Details

Title
From pole parameters to line shapes and branching ratios
Author
Heuser, L. A. 1 ; Chanturia, G. 2 ; Guo, F.-K. 3 ; Hanhart, C. 4 ; Hoferichter, M. 5 ; Kubis, B. 2 

 Forschungszentrum Jülich, Institute for Advanced Simulation, Jülich, Germany (GRID:grid.8385.6) (ISNI:0000 0001 2297 375X); Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Bonn, Germany (GRID:grid.10388.32) (ISNI:0000 0001 2240 3300) 
 Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Bonn, Germany (GRID:grid.10388.32) (ISNI:0000 0001 2240 3300) 
 CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, China (GRID:grid.486497.0) (ISNI:0000 0004 1803 484X); School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China (GRID:grid.410726.6) (ISNI:0000 0004 1797 8419); Beihang University, Peng Huanwu Collaborative Center for Research and Education, Beijing, China (GRID:grid.64939.31) (ISNI:0000 0000 9999 1211) 
 Forschungszentrum Jülich, Institute for Advanced Simulation, Jülich, Germany (GRID:grid.8385.6) (ISNI:0000 0001 2297 375X) 
 University of Bern, Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, Bern, Switzerland (GRID:grid.5734.5) (ISNI:0000 0001 0726 5157) 
Pages
599
Publication year
2024
Publication date
Jun 2024
Publisher
Springer Nature B.V.
ISSN
14346044
e-ISSN
14346052
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
3066166929
Copyright
© The Author(s) 2024. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.