Baryon transition form factors at the pole

Tiator, L.; Döring, M.; Workman, R. L.; Hadžimehmedović, M.; Osmanović, H.; Omerović, R.; Stahov, J.; Švarc, A.

doi:10.1103/PhysRevC.94.065204

Title: Baryon transition form factors at the pole

Journal Article · Wed Dec 21 00:00:00 EST 2016 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.94.065204· OSTI ID:1341786

Tiator, L. ^[1]; Döring, M. ^[2]; Workman, R. L. ^[3]; Hadžimehmedović, M. ^[4]; Osmanović, H. ^[4]; Omerović, R. ^[4]; Stahov, J. ^[4]; Švarc, A. ^[5]

Univ. of Mainz (Germany). Inst. of Nuclear Physics
George Washington Univ., Washington, DC (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
George Washington Univ., Washington, DC (United States)
Univ. of Tuzla (Bosnia and Herzegovina). Faculty of Natural Sciences and Mathematics
Ruder Boskovic Inst., Zagreb (Croatia)

Electromagnetic resonance properties are uniquely defined at the pole and do not depend on the separation of the resonance from background or the decay channel. Photon-nucleon branching ratios are nowadays often quoted at the pole, and we generalize the considerations to the case of virtual photons. In this paper, we derive and compare relations for nucleon to baryon transition form factors both for the Breit-Wigner and the pole positions. Using the MAID2007 and SAID SM08 partial wave analyses of pion electroproduction data, we compare the $$G_M$$, $$G_E$$, and $$G_C$$ form factors for the $$\Delta(1232)$$ resonance excitation at the Breit-Wigner resonance and pole positions up to $Q^2=5$ GeV$^2$. We also explore the $E/M$ and $S/M$ ratios as functions of $Q^2$. Finally, for pole and residue extraction, we apply the Laurent + Pietarinen method.

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Research Organization:: George Washington Univ., Washington, DC (United States); Univ. of Mainz (Germany); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Univ. of Tuzla (Bosnia and Herzegovina)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); German Research Foundation (DFG); Russian Foundation for Basic Research (RFBR)

Grant/Contract Number:: SC0014133; AC05-06OR23177; SFB 1044; 13-02-00425; PHY-1452055; 1415459

OSTI ID:: 1341786

Alternate ID(s):: OSTI ID: 1336971

Report Number(s):: JLAB-THY-16-2315; DOE/OR/23177-3910; arXiv:1606.00371

Journal Information:: Physical Review C, Vol. 94, Issue 6; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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