Helicity dependence of the γd → πNN reactions in theΔ -resonance region

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; E. Heid; O. Jahn; F. Klein; R. Kondratiev; M. Lang; V. Lisin; M. Martinez-Fabregate; J. C. McGeorge; W. Meyer; A. Panzeri; P. Pedroni; T. Pinelli; D. Protopopescu; G. Reicherz; Ch Rohlof; G. Rosner; T. Rostomyan; D. Ryckbosch; M. Schwamb; G. Tamas; A. Thomas; H. R. Weller

doi:10.1140/epja/i2010-10946-6

Helicity dependence of the γd → πNN reactions in theΔ -resonance region

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, E. Heid, O. Jahn, F. Klein, R. Kondratiev, M. Lang, V. Lisin, M. Martinez-Fabregate, J. C. McGeorge, W. MeyerA. Panzeri, P. Pedroni, T. Pinelli, D. Protopopescu, G. Reicherz, Ch Rohlof, G. Rosner, T. Rostomyan, D. Ryckbosch, M. Schwamb, G. Tamas, A. Thomas, H. R. Weller

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

The helicity dependence of the differential cross-section for the γd → πNN reactions has been measured for the first time in the Δ -resonance region. The measurement was performed with the large-acceptance detector DAPHNE at the tagged photon beam facility of the MAMI accelerator in Mainz. The data show that the main reaction mechanisms for the π^±NN channels are the quasi-free Nπ processes on one bound nucleon with nuclear dynamics playing a minor role. On the contrary, for the π⁰ np channel nuclear mechanisms involving the reabsorption of the photoproduced π⁰ by the np pair have to be taken into account to reproduce the experimental data.

Original language	English
Pages (from-to)	189-201
Number of pages	13
Journal	European Physical Journal A
Volume	44
Issue number	2
DOIs	https://doi.org/10.1140/epja/i2010-10946-6
Publication status	Published - May 2010
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1140/epja/i2010-10946-6

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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., Heid, E., Jahn, O., Klein, F., Kondratiev, R., Lang, M., Lisin, V., Martinez-Fabregate, M., McGeorge, J. C., ... Weller, H. R. (2010). Helicity dependence of the γd → πNN reactions in theΔ -resonance region. European Physical Journal A, 44(2), 189-201. https://doi.org/10.1140/epja/i2010-10946-6

Helicity dependence of the γd → πNN reactions in theΔ -resonance region. / 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.; Heid, E.; Jahn, O.; Klein, F.; Kondratiev, R.; Lang, M.; Lisin, V.; Martinez-Fabregate, M.; McGeorge, J. C.; Meyer, W.; Panzeri, A.; Pedroni, P.; Pinelli, T.; Protopopescu, D.; Reicherz, G.; Rohlof, Ch; Rosner, G.; Rostomyan, T.; Ryckbosch, D.; Schwamb, M.; Tamas, G.; Thomas, A.; Weller, H. R.

In: European Physical Journal A, Vol. 44, No. 2, 05.2010, p. 189-201.

Research output: Contribution to journal › Article › peer-review

Ahrens, J, Altieri, S, Annand, JRM, Arends, HJ, Beck, R, Blackston, MA, Bradtke, C, Braghieri, A, d'Hose, N, Dutz, H, Fix, A, Heid, E, Jahn, O, Klein, F, Kondratiev, R, Lang, M, Lisin, V, Martinez-Fabregate, M, McGeorge, JC, Meyer, W, Panzeri, A, Pedroni, P, Pinelli, T, Protopopescu, D, Reicherz, G, Rohlof, C, Rosner, G, Rostomyan, T, Ryckbosch, D, Schwamb, M, Tamas, G, Thomas, A & Weller, HR 2010, 'Helicity dependence of the γd → πNN reactions in theΔ -resonance region', European Physical Journal A, vol. 44, no. 2, pp. 189-201. https://doi.org/10.1140/epja/i2010-10946-6

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. ; Heid, E. ; Jahn, O. ; Klein, F. ; Kondratiev, R. ; Lang, M. ; Lisin, V. ; Martinez-Fabregate, M. ; McGeorge, J. C. ; Meyer, W. ; Panzeri, A. ; Pedroni, P. ; Pinelli, T. ; Protopopescu, D. ; Reicherz, G. ; Rohlof, Ch ; Rosner, G. ; Rostomyan, T. ; Ryckbosch, D. ; Schwamb, M. ; Tamas, G. ; Thomas, A. ; Weller, H. R. / Helicity dependence of the γd → πNN reactions in theΔ -resonance region. In: European Physical Journal A. 2010 ; Vol. 44, No. 2. pp. 189-201.

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abstract = "The helicity dependence of the differential cross-section for the γd → πNN reactions has been measured for the first time in the Δ -resonance region. The measurement was performed with the large-acceptance detector DAPHNE at the tagged photon beam facility of the MAMI accelerator in Mainz. The data show that the main reaction mechanisms for the π±NN channels are the quasi-free Nπ processes on one bound nucleon with nuclear dynamics playing a minor role. On the contrary, for the π0 np channel nuclear mechanisms involving the reabsorption of the photoproduced π0 by the np pair have to be taken into account to reproduce the experimental data.",

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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 - Heid, E.

AU - Jahn, O.

AU - Klein, F.

AU - Kondratiev, R.

AU - Lang, M.

AU - Lisin, V.

AU - Martinez-Fabregate, M.

AU - McGeorge, J. C.

AU - Meyer, W.

AU - Panzeri, A.

AU - Pedroni, P.

AU - Pinelli, T.

AU - Protopopescu, D.

AU - Reicherz, G.

AU - Rohlof, Ch

AU - Rosner, G.

AU - Rostomyan, T.

AU - Ryckbosch, D.

AU - Schwamb, M.

AU - Tamas, G.

AU - Thomas, A.

AU - Weller, H. R.

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AB - The helicity dependence of the differential cross-section for the γd → πNN reactions has been measured for the first time in the Δ -resonance region. The measurement was performed with the large-acceptance detector DAPHNE at the tagged photon beam facility of the MAMI accelerator in Mainz. The data show that the main reaction mechanisms for the π±NN channels are the quasi-free Nπ processes on one bound nucleon with nuclear dynamics playing a minor role. On the contrary, for the π0 np channel nuclear mechanisms involving the reabsorption of the photoproduced π0 by the np pair have to be taken into account to reproduce the experimental data.

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Helicity dependence of the γd → πNN reactions in theΔ -resonance region

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