Methods of parameterization of amplitudes and extraction of resonances
Seminars
Seminar “Hadron Physics”
Date and Time: Friday, 28 June 2019, at 11:00 AM
Venue: Blokhintsev Hall (4th floor), Bogoliubov Laboratory of Theoretical Physics
Seminar topic: “Methods of parameterization of amplitudes and extraction of resonances”
Speaker: R. Kaminski (BLTP JINR & INP(Krakow))
Abstract:
Amplitudes used for analyses of two-body interactions very often are not unitary therefore can not guarantee correct results. It is, however, quite easy to construct unitary amplitude or check whether given amplitude fulfills unitarity condition. Only few conditions must be fulfilled to guarantee unitarity. Presently, when in many data analyses very small, overlapping or broad signals are studied, non-unitary effects can significantly influence results and lead to nonphysical interpretation of obtained parameters. In the presentation will be shown how one can extract information about resonances from amplitudes and what pitfalls are waiting for us.