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Multichannel parametrization of \pi N scattering amplitudes and extraction of resonance parameters

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arxiv 1208.2710 v2 pith:IEA6FOJY submitted 2012-08-13 hep-ph hep-exnucl-exnucl-th

M. Shrestha , D. M. Manley This is my paper · ORCID
classification hep-phhep-exnucl-exnucl-th
keywords multichannelparametersresonanceamplitudeschannelsparametrizationpartial-wavescattering
verification ladder T0 review T1 audit T2 compute T3 formal
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We present results of a new multichannel partial-wave analysis for \pi N scattering in the c.m. energy range 1080 to 2100 MeV. This work explicitly includes \eta N and K \Lambda channels and the single pion photoproduction channel. Resonance parameters were extracted by fitting partial-wave amplitudes from all considered channels using a multichannel parametrization that is consistent with S-matrix unitarity. The resonance parameters so obtained are compared to predictions of quark models.

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Cited by 1 Pith paper

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  1. Resolving the $\Delta(1232)$ partial width anomaly: Complex pole residue is not a fundamental resonance property

    hep-ph 2025-05 conditional novelty 5.0 of 10

    Using an improved Breit-Wigner model, the paper argues that complex pole residues are amplitude-level quantities, and shows how multi-resonance interference can make the Delta(1232) partial width appear to exceed its ...

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