Beam-helicity asymmetries in double-pion photoproduction off the proton

D. Krambrich, F. Zehr, A. Fix, L. Roca, P. Aguar, J. Ahrens, J. R.M. Annand, H. J. Arends, R. Beck, V. Bekrenev, B. Boillat, A. Braghieri, D. Branford, W. J. Briscoe, J. Brudvik, S. Cherepnya, R. Codling, E. J. Downie, P. Dexler, D. I. GlazierP. Grabmayr, R. Gregor, E. Heid, D. Hornidge, O. Jahn, V. L. Kashevarov, A. Knezevic, R. Kondratiev, M. Korolija, M. Kotulla, B. Krusche, A. Kulbardis, M. Lang, V. Lisin, K. Livingston, S. Lugert, I. J.D. MacGregor, D. M. Manley, M. Martinez, J. C. McGeorge, D. Mekterovic, V. Metag, B. M.K. Nefkens, A. Nikolaev, P. Pedroni, F. Pheron, A. Polonski, S. N. Prakhov, J. W. Price, G. Rosner, M. Rost, T. Rostomyan, S. Schumann, D. Sober, A. Starostin, I. Supek, C. M. Tarbert, A. Thomas, M. Unverzagt, Th Walcher, D. P. Watts

Research School of High-Energy Physics

Research output: Contribution to journal › Article

33 Citations (Scopus)

Abstract

Beam-helicity asymmetries have been measured at the MAMI accelerator in Mainz in the three isospin channels γ→p→π+π0n, γ→p→π0π0p, and γ→p→π+π-p. The circularly polarized photons, produced from bremsstrahlung of longitudinally polarized electrons, were tagged with the Glasgow magnetic spectrometer. Charged pions and the decay photons of π0 mesons were detected in a 4π electromagnetic calorimeter which combined the Crystal Ball detector with the TAPS detector. The precisely measured asymmetries are very sensitive to details of the production processes and are thus key observables in the modeling of the reaction dynamics.

Original language	English
Article number	052002
Journal	Physical Review Letters
Volume	103
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.103.052002
Publication status	Published - 6 Aug 2009

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ASJC Scopus subject areas

Physics and Astronomy(all)

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Krambrich, D., Zehr, F., Fix, A., Roca, L., Aguar, P., Ahrens, J., Annand, J. R. M., Arends, H. J., Beck, R., Bekrenev, V., Boillat, B., Braghieri, A., Branford, D., Briscoe, W. J., Brudvik, J., Cherepnya, S., Codling, R., Downie, E. J., Dexler, P., ... Watts, D. P. (2009). Beam-helicity asymmetries in double-pion photoproduction off the proton. Physical Review Letters, 103(5), [052002]. https://doi.org/10.1103/PhysRevLett.103.052002

Beam-helicity asymmetries in double-pion photoproduction off the proton. / Krambrich, D.; Zehr, F.; Fix, A.; Roca, L.; Aguar, P.; Ahrens, J.; Annand, J. R.M.; Arends, H. J.; Beck, R.; Bekrenev, V.; Boillat, B.; Braghieri, A.; Branford, D.; Briscoe, W. J.; Brudvik, J.; Cherepnya, S.; Codling, R.; Downie, E. J.; Dexler, P.; Glazier, D. I.; Grabmayr, P.; Gregor, R.; Heid, E.; Hornidge, D.; Jahn, O.; Kashevarov, V. L.; Knezevic, A.; Kondratiev, R.; Korolija, M.; Kotulla, M.; Krusche, B.; Kulbardis, A.; Lang, M.; Lisin, V.; Livingston, K.; Lugert, S.; MacGregor, I. J.D.; Manley, D. M.; Martinez, M.; McGeorge, J. C.; Mekterovic, D.; Metag, V.; Nefkens, B. M.K.; Nikolaev, A.; Pedroni, P.; Pheron, F.; Polonski, A.; Prakhov, S. N.; Price, J. W.; Rosner, G.; Rost, M.; Rostomyan, T.; Schumann, S.; Sober, D.; Starostin, A.; Supek, I.; Tarbert, C. M.; Thomas, A.; Unverzagt, M.; Walcher, Th; Watts, D. P.

In: Physical Review Letters, Vol. 103, No. 5, 052002, 06.08.2009.

Research output: Contribution to journal › Article

Krambrich, D, Zehr, F, Fix, A, Roca, L, Aguar, P, Ahrens, J, Annand, JRM, Arends, HJ, Beck, R, Bekrenev, V, Boillat, B, Braghieri, A, Branford, D, Briscoe, WJ, Brudvik, J, Cherepnya, S, Codling, R, Downie, EJ, Dexler, P, Glazier, DI, Grabmayr, P, Gregor, R, Heid, E, Hornidge, D, Jahn, O, Kashevarov, VL, Knezevic, A, Kondratiev, R, Korolija, M, Kotulla, M, Krusche, B, Kulbardis, A, Lang, M, Lisin, V, Livingston, K, Lugert, S, MacGregor, IJD, Manley, DM, Martinez, M, McGeorge, JC, Mekterovic, D, Metag, V, Nefkens, BMK, Nikolaev, A, Pedroni, P, Pheron, F, Polonski, A, Prakhov, SN, Price, JW, Rosner, G, Rost, M, Rostomyan, T, Schumann, S, Sober, D, Starostin, A, Supek, I, Tarbert, CM, Thomas, A, Unverzagt, M, Walcher, T & Watts, DP 2009, 'Beam-helicity asymmetries in double-pion photoproduction off the proton', Physical Review Letters, vol. 103, no. 5, 052002. https://doi.org/10.1103/PhysRevLett.103.052002

Krambrich, D. ; Zehr, F. ; Fix, A. ; Roca, L. ; Aguar, P. ; Ahrens, J. ; Annand, J. R.M. ; Arends, H. J. ; Beck, R. ; Bekrenev, V. ; Boillat, B. ; Braghieri, A. ; Branford, D. ; Briscoe, W. J. ; Brudvik, J. ; Cherepnya, S. ; Codling, R. ; Downie, E. J. ; Dexler, P. ; Glazier, D. I. ; Grabmayr, P. ; Gregor, R. ; Heid, E. ; Hornidge, D. ; Jahn, O. ; Kashevarov, V. L. ; Knezevic, A. ; Kondratiev, R. ; Korolija, M. ; Kotulla, M. ; Krusche, B. ; Kulbardis, A. ; Lang, M. ; Lisin, V. ; Livingston, K. ; Lugert, S. ; MacGregor, I. J.D. ; Manley, D. M. ; Martinez, M. ; McGeorge, J. C. ; Mekterovic, D. ; Metag, V. ; Nefkens, B. M.K. ; Nikolaev, A. ; Pedroni, P. ; Pheron, F. ; Polonski, A. ; Prakhov, S. N. ; Price, J. W. ; Rosner, G. ; Rost, M. ; Rostomyan, T. ; Schumann, S. ; Sober, D. ; Starostin, A. ; Supek, I. ; Tarbert, C. M. ; Thomas, A. ; Unverzagt, M. ; Walcher, Th ; Watts, D. P. / Beam-helicity asymmetries in double-pion photoproduction off the proton. In: Physical Review Letters. 2009 ; Vol. 103, No. 5.

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title = "Beam-helicity asymmetries in double-pion photoproduction off the proton",

abstract = "Beam-helicity asymmetries have been measured at the MAMI accelerator in Mainz in the three isospin channels γ→p→π+π0n, γ→p→π0π0p, and γ→p→π+π-p. The circularly polarized photons, produced from bremsstrahlung of longitudinally polarized electrons, were tagged with the Glasgow magnetic spectrometer. Charged pions and the decay photons of π0 mesons were detected in a 4π electromagnetic calorimeter which combined the Crystal Ball detector with the TAPS detector. The precisely measured asymmetries are very sensitive to details of the production processes and are thus key observables in the modeling of the reaction dynamics.",

author = "D. Krambrich and F. Zehr and A. Fix and L. Roca and P. Aguar and J. Ahrens and Annand, {J. R.M.} and Arends, {H. J.} and R. Beck and V. Bekrenev and B. Boillat and A. Braghieri and D. Branford and Briscoe, {W. J.} and J. Brudvik and S. Cherepnya and R. Codling and Downie, {E. J.} and P. Dexler and Glazier, {D. I.} and P. Grabmayr and R. Gregor and E. Heid and D. Hornidge and O. Jahn and Kashevarov, {V. L.} and A. Knezevic and R. Kondratiev and M. Korolija and M. Kotulla and B. Krusche and A. Kulbardis and M. Lang and V. Lisin and K. Livingston and S. Lugert and MacGregor, {I. J.D.} and Manley, {D. M.} and M. Martinez and McGeorge, {J. C.} and D. Mekterovic and V. Metag and Nefkens, {B. M.K.} and A. Nikolaev and P. Pedroni and F. Pheron and A. Polonski and Prakhov, {S. N.} and Price, {J. W.} and G. Rosner and M. Rost and T. Rostomyan and S. Schumann and D. Sober and A. Starostin and I. Supek and Tarbert, {C. M.} and A. Thomas and M. Unverzagt and Th Walcher and Watts, {D. P.}",

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AU - Krambrich, D.

AU - Zehr, F.

AU - Fix, A.

AU - Roca, L.

AU - Aguar, P.

AU - Ahrens, J.

AU - Annand, J. R.M.

AU - Arends, H. J.

AU - Beck, R.

AU - Bekrenev, V.

AU - Boillat, B.

AU - Braghieri, A.

AU - Branford, D.

AU - Briscoe, W. J.

AU - Brudvik, J.

AU - Cherepnya, S.

AU - Codling, R.

AU - Downie, E. J.

AU - Dexler, P.

AU - Glazier, D. I.

AU - Grabmayr, P.

AU - Gregor, R.

AU - Heid, E.

AU - Hornidge, D.

AU - Jahn, O.

AU - Kashevarov, V. L.

AU - Knezevic, A.

AU - Kondratiev, R.

AU - Korolija, M.

AU - Kotulla, M.

AU - Krusche, B.

AU - Kulbardis, A.

AU - Lang, M.

AU - Lisin, V.

AU - Livingston, K.

AU - Lugert, S.

AU - MacGregor, I. J.D.

AU - Manley, D. M.

AU - Martinez, M.

AU - McGeorge, J. C.

AU - Mekterovic, D.

AU - Metag, V.

AU - Nefkens, B. M.K.

AU - Nikolaev, A.

AU - Pedroni, P.

AU - Pheron, F.

AU - Polonski, A.

AU - Prakhov, S. N.

AU - Price, J. W.

AU - Rosner, G.

AU - Rost, M.

AU - Rostomyan, T.

AU - Schumann, S.

AU - Sober, D.

AU - Starostin, A.

AU - Supek, I.

AU - Tarbert, C. M.

AU - Thomas, A.

AU - Unverzagt, M.

AU - Walcher, Th

AU - Watts, D. P.

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AB - Beam-helicity asymmetries have been measured at the MAMI accelerator in Mainz in the three isospin channels γ→p→π+π0n, γ→p→π0π0p, and γ→p→π+π-p. The circularly polarized photons, produced from bremsstrahlung of longitudinally polarized electrons, were tagged with the Glasgow magnetic spectrometer. Charged pions and the decay photons of π0 mesons were detected in a 4π electromagnetic calorimeter which combined the Crystal Ball detector with the TAPS detector. The precisely measured asymmetries are very sensitive to details of the production processes and are thus key observables in the modeling of the reaction dynamics.

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10.1103/PhysRevLett.103.052002