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- W1902044411 abstract "We present a new approach to quantifying pole parameters of single-channel processes based on Laurent expansion of partial wave T-matrices. Instead of guessing the analytical form of non-singular part of Laurent expansion as it is usually done, we represent it by the convergent series of Pietarinen functions. As the analytic structure of non-singular term is usually very well known (physical cuts with branhcpoints at inelastic thresholds, and unphysical cuts in the negative energy plane), we show that we need one Pietarinen series per cut, and the number of terms in each Pietarinen series is automatically determined by the quality of the t. The method is tested on a toy model constructed from two known poles, various background terms, and two physical cuts, and shown to be robust and condent up to three Pietarinen series. We also apply this method to Zagreb CMB amplitudes for the N(1535) 1/2- resonance, and conrm the full success of the method on realistic data. This formalism can also be used for tting experimental data, and the procedure is very similar as when" @default.
- W1902044411 created "2016-06-24" @default.
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- W1902044411 date "2012-12-06" @default.
- W1902044411 modified "2023-09-27" @default.
- W1902044411 title "A new method for extracting poles from single-channel data based on Laurent expansion of T-matrices with Pietarinen power series representing the non-singular part" @default.
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