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2017 ; 7
(ä): 45246
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Fundamental properties of resonances
#MMPMID28345595
Ceci S
; Had?imehmedovi? M
; Osmanovi? H
; Percan A
; Zauner B
Sci Rep
2017[Mar]; 7
(ä): 45246
PMID28345595
show ga
All resonances, from hydrogen nuclei excited by the high-energy gamma rays in
deep space to newly discovered particles produced in Large Hadron Collider,
should be described by the same fundamental physical quantities. However, two
distinct sets of properties are used to describe resonances: the pole parameters
(complex pole position and residue) and the Breit-Wigner parameters (mass, width,
and branching fractions). There is an ongoing decades-old debate on which one of
them should be abandoned. In this study of nucleon resonances appearing in the
elastic pion-nucleon scattering we discover an intricate interplay of the
parameters from both sets, and realize that neither set is completely independent
or fundamental on its own.