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 | |
| Publication status | Published - 6 Aug 2009 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
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
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TY - JOUR
T1 - Beam-helicity asymmetries in double-pion photoproduction off the proton
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.
PY - 2009/8/6
Y1 - 2009/8/6
N2 - 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.
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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U2 - 10.1103/PhysRevLett.103.052002
DO - 10.1103/PhysRevLett.103.052002
M3 - Article
VL - 103
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 5
M1 - 052002
ER -