Leon Heuser(HISKP): "From pole parameters to line shapes and branching ratios"

Monday 6 May 2024, 15:15 → 17:00 Europe/Berlin

Nußallee 14-16/3.013 (HISKP) - Seminar Room II (HISKP)

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 $\rho(770)$ and $f_0(500)$ 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.