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Intermediate resonance excitation in the gamma p -> p pi(0)pi(0) reaction

Ahrens, J; Altieri, S; Annand, JRM; Anton, G; Arends, HJ; Aulenbacher, K; Beck, R; Bradtke, C; Braghieri, A and Degrande, N, et al. (2005) In Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics 624(3-4). p.173-180
Abstract
The helicity dependence of the total cross section for the (gamma) over right arrow(p) over right arrow -> p pi(0)pi(0) reaction has been measured for the first time at incident photon energies from 400 to 800 MeV. The measurement, performed at the tagged photon beam facility of the MAMI accelerator in Mainz, used the large acceptance detector DAPHNE and a longitudinally polarized frozen-spin target. This channel is found to be excited predominantly when the photon and proton have a parallel spin orientation, most likely due to the intermediate production of the D-13(1520) resonance. However, the contribution of the antiparallel spin configuration, arising from other reaction mechanisms, is also not negligible. This result gives... (More)
The helicity dependence of the total cross section for the (gamma) over right arrow(p) over right arrow -> p pi(0)pi(0) reaction has been measured for the first time at incident photon energies from 400 to 800 MeV. The measurement, performed at the tagged photon beam facility of the MAMI accelerator in Mainz, used the large acceptance detector DAPHNE and a longitudinally polarized frozen-spin target. This channel is found to be excited predominantly when the photon and proton have a parallel spin orientation, most likely due to the intermediate production of the D-13(1520) resonance. However, the contribution of the antiparallel spin configuration, arising from other reaction mechanisms, is also not negligible. This result gives important new information to resolve the existing model discrepancies in the identification of the nucleon resonances contributing to this channel. (Less)
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Contribution to journal
publication status
published
subject
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Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
624
issue
3-4
pages
173 - 180
publisher
Elsevier
external identifiers
  • wos:000232169100007
  • scopus:24344459535
ISSN
0370-2693
DOI
10.1016/j.physletb.2005.08.034
language
English
LU publication?
yes
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7a969c9e-b442-4638-a6f0-3d411464229a (old id 220654)
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2007-08-14 16:14:58
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2017-01-01 06:53:55
@article{7a969c9e-b442-4638-a6f0-3d411464229a,
  abstract     = {The helicity dependence of the total cross section for the (gamma) over right arrow(p) over right arrow -> p pi(0)pi(0) reaction has been measured for the first time at incident photon energies from 400 to 800 MeV. The measurement, performed at the tagged photon beam facility of the MAMI accelerator in Mainz, used the large acceptance detector DAPHNE and a longitudinally polarized frozen-spin target. This channel is found to be excited predominantly when the photon and proton have a parallel spin orientation, most likely due to the intermediate production of the D-13(1520) resonance. However, the contribution of the antiparallel spin configuration, arising from other reaction mechanisms, is also not negligible. This result gives important new information to resolve the existing model discrepancies in the identification of the nucleon resonances contributing to this channel.},
  author       = {Ahrens, J and Altieri, S and Annand, JRM and Anton, G and Arends, HJ and Aulenbacher, K and Beck, R and Bradtke, C and Braghieri, A and Degrande, N and d'Hose, N and Dutz, H and Goertz, S and Grabmayr, P and Hansen, Kurt and Harmsen, J and von Harrach, D and Hasegawa, S and Hasegawa, T and Heid, E and Helbing, K and Holvoet, H and Van Hoorebeke, L and Horikawa, N and Iwata, T and Jahn, O and Jennewein, P and Kageya, T and Kiel, B and Klein, F and Kondratiev, R and Kossert, K and Krimmer, J and Lang, M and Lannoy, B and Leukel, R and Lisin, V and Matsuda, T and McGeorge, JC and Meier, A and Menze, D and Meyer, W and Michel, T and Naumann, J and Panzeri, A and Pedroni, P and Pinelli, T and Preobrajenski, I and Radtke, E and Reichert, E and Reicherz, G and Rohlof, C and Rosner, G and Rostomyan, T and Ryckbosch, D and Sauer, M and Schoch, B and Schumacher, M and Seitz, B and Speckner, T and Takabayashi, N and Tamas, G and Thomas, A and van de Vyver, R and Wakai, A and Weihofen, W and Wissmann, F and Zapadtka, F and Zeitler, G},
  issn         = {0370-2693},
  language     = {eng},
  number       = {3-4},
  pages        = {173--180},
  publisher    = {Elsevier},
  series       = {Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics},
  title        = {Intermediate resonance excitation in the gamma p -> p pi(0)pi(0) reaction},
  url          = {http://dx.doi.org/10.1016/j.physletb.2005.08.034},
  volume       = {624},
  year         = {2005},
}