First measurement of the helicity dependence for the γp → pπreaction

J. Ahrens, S. Altieri, J. R.M. Annand, H. J. Arends, R. Beck, M. A. Blackston, C. Bradtke, A. Braghieri, N. D'Hose, H. Dutz, A. Fix, S. Goertz, P. Grabmayr, S. Hasegawa, E. Heid, H. Holvoet, N. Horikawa, T. Iwata, O. Jahn, P. Jennewein & 25 others F. Klein, R. Kondratiev, M. Lang, B. Lannoy, V. Lisin, M. Martinez-Fabregate, J. C. McGeorge, W. Meyer, A. Panzeri, P. Pedroni, T. Pinelli, I. Preobrajenski, G. Reicherz, Ch Rohlof, G. Rosner, M. Rost, T. Rostomyan, D. Ryckbosch, M. Schumacher, B. Seitz, G. Tamas, A. Thomas, R. Van De Vyver, H. R. Weller, F. Zapadtka

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The helicity dependence of the total cross-section and the invariant-mass distributions in the (pπ±) and (π+π -) final states for the γp → pπ+π - reaction have been measured for the first time at incident photon energies from 400 to 800MeV. The measurement was performed with the large-acceptance detector DAPHNE at the tagged photon beam facility of the MAMI accelerator in Mainz. Although this channel is found to be predominantly excited by the intermediate production of a Δπ state, both the measured unpolarized and the helicity-dependent observables are generally not well described by the existing theoretical models.

Original languageEnglish
Pages (from-to)11-21
Number of pages11
JournalEuropean Physical Journal A
Volume34
Issue number1
DOIs
Publication statusPublished - 1 Oct 2007

Fingerprint

photon beams
mass distribution
acceptability
accelerators
detectors
cross sections
photons
energy

Keywords

  • 13.60.Le Meson production
  • 14.20.Gk Baryon resonances with S = 0
  • 25.20.Lj Photoproduction reactions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Ahrens, J., Altieri, S., Annand, J. R. M., Arends, H. J., Beck, R., Blackston, M. A., ... Zapadtka, F. (2007). First measurement of the helicity dependence for the γp → pπreaction. European Physical Journal A, 34(1), 11-21. https://doi.org/10.1140/epja/i2007-10491-5

First measurement of the helicity dependence for the γp → pπreaction. / Ahrens, J.; Altieri, S.; Annand, J. R.M.; Arends, H. J.; Beck, R.; Blackston, M. A.; Bradtke, C.; Braghieri, A.; D'Hose, N.; Dutz, H.; Fix, A.; Goertz, S.; Grabmayr, P.; Hasegawa, S.; Heid, E.; Holvoet, H.; Horikawa, N.; Iwata, T.; Jahn, O.; Jennewein, P.; Klein, F.; Kondratiev, R.; Lang, M.; Lannoy, B.; Lisin, V.; Martinez-Fabregate, M.; McGeorge, J. C.; Meyer, W.; Panzeri, A.; Pedroni, P.; Pinelli, T.; Preobrajenski, I.; Reicherz, G.; Rohlof, Ch; Rosner, G.; Rost, M.; Rostomyan, T.; Ryckbosch, D.; Schumacher, M.; Seitz, B.; Tamas, G.; Thomas, A.; Van De Vyver, R.; Weller, H. R.; Zapadtka, F.

In: European Physical Journal A, Vol. 34, No. 1, 01.10.2007, p. 11-21.

Research output: Contribution to journalArticle

Ahrens, J, Altieri, S, Annand, JRM, Arends, HJ, Beck, R, Blackston, MA, Bradtke, C, Braghieri, A, D'Hose, N, Dutz, H, Fix, A, Goertz, S, Grabmayr, P, Hasegawa, S, Heid, E, Holvoet, H, Horikawa, N, Iwata, T, Jahn, O, Jennewein, P, Klein, F, Kondratiev, R, Lang, M, Lannoy, B, Lisin, V, Martinez-Fabregate, M, McGeorge, JC, Meyer, W, Panzeri, A, Pedroni, P, Pinelli, T, Preobrajenski, I, Reicherz, G, Rohlof, C, Rosner, G, Rost, M, Rostomyan, T, Ryckbosch, D, Schumacher, M, Seitz, B, Tamas, G, Thomas, A, Van De Vyver, R, Weller, HR & Zapadtka, F 2007, 'First measurement of the helicity dependence for the γp → pπreaction', European Physical Journal A, vol. 34, no. 1, pp. 11-21. https://doi.org/10.1140/epja/i2007-10491-5
Ahrens J, Altieri S, Annand JRM, Arends HJ, Beck R, Blackston MA et al. First measurement of the helicity dependence for the γp → pπreaction. European Physical Journal A. 2007 Oct 1;34(1):11-21. https://doi.org/10.1140/epja/i2007-10491-5
Ahrens, J. ; Altieri, S. ; Annand, J. R.M. ; Arends, H. J. ; Beck, R. ; Blackston, M. A. ; Bradtke, C. ; Braghieri, A. ; D'Hose, N. ; Dutz, H. ; Fix, A. ; Goertz, S. ; Grabmayr, P. ; Hasegawa, S. ; Heid, E. ; Holvoet, H. ; Horikawa, N. ; Iwata, T. ; Jahn, O. ; Jennewein, P. ; Klein, F. ; Kondratiev, R. ; Lang, M. ; Lannoy, B. ; Lisin, V. ; Martinez-Fabregate, M. ; McGeorge, J. C. ; Meyer, W. ; Panzeri, A. ; Pedroni, P. ; Pinelli, T. ; Preobrajenski, I. ; Reicherz, G. ; Rohlof, Ch ; Rosner, G. ; Rost, M. ; Rostomyan, T. ; Ryckbosch, D. ; Schumacher, M. ; Seitz, B. ; Tamas, G. ; Thomas, A. ; Van De Vyver, R. ; Weller, H. R. ; Zapadtka, F. / First measurement of the helicity dependence for the γp → pπreaction. In: European Physical Journal A. 2007 ; Vol. 34, No. 1. pp. 11-21.
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abstract = "The helicity dependence of the total cross-section and the invariant-mass distributions in the (pπ±) and (π+π -) final states for the γp → pπ+π - reaction have been measured for the first time at incident photon energies from 400 to 800MeV. The measurement was performed with the large-acceptance detector DAPHNE at the tagged photon beam facility of the MAMI accelerator in Mainz. Although this channel is found to be predominantly excited by the intermediate production of a Δπ state, both the measured unpolarized and the helicity-dependent observables are generally not well described by the existing theoretical models.",
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T1 - First measurement of the helicity dependence for the γp → pπreaction

AU - Ahrens, J.

AU - Altieri, S.

AU - Annand, J. R.M.

AU - Arends, H. J.

AU - Beck, R.

AU - Blackston, M. A.

AU - Bradtke, C.

AU - Braghieri, A.

AU - D'Hose, N.

AU - Dutz, H.

AU - Fix, A.

AU - Goertz, S.

AU - Grabmayr, P.

AU - Hasegawa, S.

AU - Heid, E.

AU - Holvoet, H.

AU - Horikawa, N.

AU - Iwata, T.

AU - Jahn, O.

AU - Jennewein, P.

AU - Klein, F.

AU - Kondratiev, R.

AU - Lang, M.

AU - Lannoy, B.

AU - Lisin, V.

AU - Martinez-Fabregate, M.

AU - McGeorge, J. C.

AU - Meyer, W.

AU - Panzeri, A.

AU - Pedroni, P.

AU - Pinelli, T.

AU - Preobrajenski, I.

AU - Reicherz, G.

AU - Rohlof, Ch

AU - Rosner, G.

AU - Rost, M.

AU - Rostomyan, T.

AU - Ryckbosch, D.

AU - Schumacher, M.

AU - Seitz, B.

AU - Tamas, G.

AU - Thomas, A.

AU - Van De Vyver, R.

AU - Weller, H. R.

AU - Zapadtka, F.

PY - 2007/10/1

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N2 - The helicity dependence of the total cross-section and the invariant-mass distributions in the (pπ±) and (π+π -) final states for the γp → pπ+π - reaction have been measured for the first time at incident photon energies from 400 to 800MeV. The measurement was performed with the large-acceptance detector DAPHNE at the tagged photon beam facility of the MAMI accelerator in Mainz. Although this channel is found to be predominantly excited by the intermediate production of a Δπ state, both the measured unpolarized and the helicity-dependent observables are generally not well described by the existing theoretical models.

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KW - 13.60.Le Meson production

KW - 14.20.Gk Baryon resonances with S = 0

KW - 25.20.Lj Photoproduction reactions

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