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Hints on the quadrupole deformation of the Δ(1232)

AuthorsFernández-Ramírez, César CSIC; Moya de Guerra, Elvira ORCID; Udías, J. M.
Issue Date18-Apr-2006
PublisherAmerican Physical Society
CitationPhysical Review C - Nuclear Physics 73: 042201(R) (2006)
AbstractThe E2/M1 ratio (EMR) of the Δ(1232) is extracted from the world data in pion photoproduction by means of an effective Lagrangian approach (ELA). This quantity has been derived within a crossing symmetric, gauge invariant, and chiral symmetric Lagrangian model which also contains a consistent modern treatment of the Δ(1232) resonance. The bare s-channel Δ(1232) contribution is well isolated and final state interactions (FSI) are effectively taken into account fulfilling Watson's theorem. The obtained EMR value, EMR =(-1.30±0.52)%, is in good agreement with the latest lattice QCD calculations [Phys. Rev. Lett. 94, 021601 (2005)] and disagrees with results of current quark model calculations. © 2006 The American Physical Society.
Description5 págs.; 3 figs.; 2 tabs. ; PACS number(s): 14.20.Gk, 14.20.Dh, 25.20.Lj, 13.60.Le ; Rapid Communications
Publisher version (URL)https://doi.org/10.1103/PhysRevC.73.042201
Identifiersdoi: 10.1103/PhysRevC.73.042201
issn: 0556-2813
Appears in Collections:(CFMAC-IEM) Artículos
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