New results on the Roper resonance and the P(11) partial wave - INSPIRE

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New results on the Roper resonance and the P(11) partial wave

Jul, 2007

13 pages

Published in:

Phys.Lett.B 659 (2008) 94-100

e-Print:

0707.3591 [hep-ph]

DOI:

10.1016/j.physletb.2007.11.055

View in:

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Abstract: (Elsevier)

Properties of the Roper resonance, the first scalar excitation of the nucleon, are determined. Pole positions and residues of the P11 partial wave are studied in a combined analysis of pion- and photo-induced reactions. We find the Roper pole at {(1371±7)−i(92±10)} MeV and an elasticity of 0.61±0.03 . The largest decay coupling is found for the Nσ ( σ=(ππ) - S -wave). The analysis is based on new data on γp→pπ0π0 for photons in the energy range from the two-pion threshold to 820 MeV from TAPS at Mainz and from 0.4 to 1.3 GeV from Crystal Barrel at Bonn and includes further data from other experiments. The partial wave analysis excludes the possibility that the Roper resonance is split into two states with different partial decay widths.

Note:

13 pages, 4 figures

13.40.-f
11.80.Et
13.60.Le
13.30.-a
photon p: exclusive reaction
pi0: photoproduction
pi0: pair production
pi nucleon: interaction
channel cross section
mass spectrum: missing-mass

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