Backward pion-nucleon scattering

Journal Article · Mon Feb 01 00:00:00 EST 2010 · European Physical Journal. A

DOI:https://doi.org/10.1140/epja/i2010-10930-2· OSTI ID:983608

Sibirtsev, Alex ^[1]; Haidenbauer, Johann ^[2]; Meissner, Ulf-G. ^[3]

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1. Helmholtz-Institut furr Strahlen- und Kernphysik (Theorie) und Bethe Center for Theoretical Physics, Universitat Bonn, D-53115 Bonn, Germany; Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
2. Forschungszentrum Julich (Germany)
3. Helmholtz-Institut fur Strahlen- und Kernphysik (Theorie) und Bethe Center for Theoretical Physics, Universitat Bonn, Bonn, Germany; Forschungszentrum Julich (Germany)

A global analysis of the world data on differential cross sections and polarization asymmetries of backward pion-nucleon scattering for invariant collision energies above 3 GeV is performed in a Regge model. Including the $$N_\alpha$$, $$N_\gamma$$, $$\Delta_\delta$$ and $$\Delta_\beta$$ trajectories, we reproduce both angular distributions and polarization data for small values of the Mandelstam variable $$u$$, in contrast to previous analyses. The model amplitude is used to obtain evidence for baryon resonances with mass below 3 GeV. Our analysis suggests a $$G_{39}$$ resonance with a mass of 2.83 GeV as member of the $$\Delta_{\beta}$$ trajectory from the corresponding Chew-Frautschi plot.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 983608
• Report Number(s): JLAB-THY-09-1095; DOE/OR/23177-1033; TRN: US1004584
• Journal Information: European Physical Journal. A, Vol. 44, Issue 1; ISSN 1434-6001
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
ANGULAR DISTRIBUTION
BARYONS
DIFFERENTIAL CROSS SECTIONS
GLOBAL ANALYSIS
POLARIZATION
RESONANCE
SCATTERING
TRAJECTORIES