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; 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

doi:10.1140/epja/i2007-10491-5

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. JenneweinF. 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 journal › Article › peer-review

29 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 language	English
Article number	11
Pages (from-to)	11-21
Number of pages	11
Journal	European Physical Journal A
Volume	34
Issue number	1
DOIs	https://doi.org/10.1140/epja/i2007-10491-5
Publication status	Published - Oct 2007
Externally published	Yes

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

Access to Document

10.1140/epja/i2007-10491-5

Cite this

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., ... Zapadtka, F. (2007). First measurement of the helicity dependence for the γp → pπreaction. European Physical Journal A, 34(1), 11-21. Article 11. https://doi.org/10.1140/epja/i2007-10491-5

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, 11, pp. 11-21. https://doi.org/10.1140/epja/i2007-10491-5

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title = "First measurement of the helicity dependence for the γp → pπreaction",

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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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

Y1 - 2007/10

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.

AB - 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.

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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EP - 21

JO - European Physical Journal A

JF - European Physical Journal A

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ER -

First measurement of the helicity dependence for the γp → pπreaction

Abstract

Keywords

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