Photoproduction of pi(0)pi(0)- and pi(0)pi(+)-pairs off the proton from threshold to the second resonance region

MAMI Collaboration; TAPS Collaboration; A2 Collaboration; F. Zehr; B. Krusche; 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. F. B. Codling; E. J. Downie; P. Drexler; D. I. Glazier; L. V. Fil'kov; A. Fix; R. Gregor; E. Heid; D. Hornidge; I. Jaegle; O. Jahn; V. L. Kashevarov; A. Knezevic; R. Kondratiev; M. Korolija; M. Kotulla; D. Krambrich; A. Kulbardis; M. Lang; V. Lisin; K. Livingston; S. Lugert; I. J. D. MacGregor; D. M. Manley; Y. Maghrbi; M. Martinez; J. C. McGeorge; D. Mekterovic; V. Metag; B. M. K. Nefkens; A. Nikolaev; M. Ostrick; P. Pedroni; F. Pheron; A. Polonski; D. P. Watts

doi:10.1140/epja/i2012-12098-1

Photoproduction of pi(0)pi(0)- and pi(0)pi(+)-pairs off the proton from threshold to the second resonance region

MAMI Collaboration, TAPS Collaboration, A2 Collaboration, F. Zehr^*, B. Krusche, 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. F. B. Codling, E. J. Downie, P. DrexlerD. I. Glazier, L. V. Fil'kov, A. Fix, R. Gregor, E. Heid, D. Hornidge, I. Jaegle, O. Jahn, V. L. Kashevarov, A. Knezevic, R. Kondratiev, M. Korolija, M. Kotulla, D. Krambrich, A. Kulbardis, M. Lang, V. Lisin, K. Livingston, S. Lugert, I. J. D. MacGregor, D. M. Manley, Y. Maghrbi, M. Martinez, J. C. McGeorge, D. Mekterovic, V. Metag, B. M. K. Nefkens, A. Nikolaev, M. Ostrick, P. Pedroni, F. Pheron, A. Polonski, D. P. Watts

^*Corresponding author for this work

School of Physics and Astronomy

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Abstract / Description of output

Precise total cross-sections and invariant-mass distributions have been measured for photoproduction of pion pairs off the proton producing p pi(0)pi(0) and n pi(+)pi(0) final states from the threshold region up to 800 MeV incident photon energy. Additionally, beam helicity asymmetries have been measured in the second resonance region (550 MeV-820 MeV). The experiment was performed at the tagged photon beam of the Mainz MAMI accelerator with the Crystal Ball and TAPS detectors combined to give an almost 4 pi solid-angle electromagnetic calorimeter. The results are much more precise than any previous measurements and confirm the chiral perturbation theory predictions for the threshold behavior of these reactions. In the second resonance region, the invariant-mass distributions of meson-meson and meson-nucleon pairs are in reasonable agreement with model predictions, but none of the models reproduce the asymmetries for the mixed-charge channel.

Original language	English
Article number	98
Number of pages	19
Journal	The European Physical Journal A (EPJ A)
Volume	48
Issue number	7
DOIs	https://doi.org/10.1140/epja/i2012-12098-1
Publication status	Published - Jul 2012

Keywords / Materials (for Non-textual outputs)

DOUBLE-PION-PHOTOPRODUCTION
CHIRAL PERTURBATION-THEORY
TOTAL CROSS-SECTION
TAGGED PHOTON SPECTROMETER
HELICITY DEPENDENCE
NUCLEON RESONANCE
SIGMA-MESON
GAMMA
POLARIZATION
EXCITATION

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10.1140/epja/i2012-12098-1

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MAMI Collaboration, TAPS Collaboration, A2 Collaboration, Zehr, F., Krusche, B., 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. F. B., Downie, E. J., ... Watts, D. P. (2012). Photoproduction of pi(0)pi(0)- and pi(0)pi(+)-pairs off the proton from threshold to the second resonance region. The European Physical Journal A (EPJ A), 48(7), Article 98. https://doi.org/10.1140/epja/i2012-12098-1

@article{26d8c871461c488e84dcf0c70c0ed2a3,

title = "Photoproduction of pi(0)pi(0)- and pi(0)pi(+)-pairs off the proton from threshold to the second resonance region",

abstract = "Precise total cross-sections and invariant-mass distributions have been measured for photoproduction of pion pairs off the proton producing p pi(0)pi(0) and n pi(+)pi(0) final states from the threshold region up to 800 MeV incident photon energy. Additionally, beam helicity asymmetries have been measured in the second resonance region (550 MeV-820 MeV). The experiment was performed at the tagged photon beam of the Mainz MAMI accelerator with the Crystal Ball and TAPS detectors combined to give an almost 4 pi solid-angle electromagnetic calorimeter. The results are much more precise than any previous measurements and confirm the chiral perturbation theory predictions for the threshold behavior of these reactions. In the second resonance region, the invariant-mass distributions of meson-meson and meson-nucleon pairs are in reasonable agreement with model predictions, but none of the models reproduce the asymmetries for the mixed-charge channel.",

keywords = "DOUBLE-PION-PHOTOPRODUCTION, CHIRAL PERTURBATION-THEORY, TOTAL CROSS-SECTION, TAGGED PHOTON SPECTROMETER, HELICITY DEPENDENCE, NUCLEON RESONANCE, SIGMA-MESON, GAMMA, POLARIZATION, EXCITATION",

author = "{MAMI Collaboration} and {TAPS Collaboration} and {A2 Collaboration} and F. Zehr and B. Krusche 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 Codling, {R. F. B.} and Downie, {E. J.} and P. Drexler and Glazier, {D. I.} and Fil'kov, {L. V.} and A. Fix and R. Gregor and E. Heid and D. Hornidge and I. Jaegle and O. Jahn and Kashevarov, {V. L.} and A. Knezevic and R. Kondratiev and M. Korolija and M. Kotulla and D. Krambrich 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 Y. Maghrbi and M. Martinez and McGeorge, {J. C.} and D. Mekterovic and V. Metag and Nefkens, {B. M. K.} and A. Nikolaev and M. Ostrick and P. Pedroni and F. Pheron and A. Polonski and Watts, {D. P.}",

year = "2012",

month = jul,

doi = "10.1140/epja/i2012-12098-1",

language = "English",

volume = "48",

journal = "The European Physical Journal A (EPJ A)",

issn = "1434-6001",

publisher = "Springer",

number = "7",

}

MAMI Collaboration, TAPS Collaboration, A2 Collaboration, Zehr, F, Krusche, B, 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, RFB, Downie, EJ, Drexler, P, Glazier, DI, Fil'kov, LV, Fix, A, Gregor, R, Heid, E, Hornidge, D, Jaegle, I, Jahn, O, Kashevarov, VL, Knezevic, A, Kondratiev, R, Korolija, M, Kotulla, M, Krambrich, D, Kulbardis, A, Lang, M, Lisin, V, Livingston, K, Lugert, S, MacGregor, IJD, Manley, DM, Maghrbi, Y, Martinez, M, McGeorge, JC, Mekterovic, D, Metag, V, Nefkens, BMK, Nikolaev, A, Ostrick, M, Pedroni, P, Pheron, F, Polonski, A & Watts, DP 2012, 'Photoproduction of pi(0)pi(0)- and pi(0)pi(+)-pairs off the proton from threshold to the second resonance region', The European Physical Journal A (EPJ A), vol. 48, no. 7, 98. https://doi.org/10.1140/epja/i2012-12098-1

TY - JOUR

T1 - Photoproduction of pi(0)pi(0)- and pi(0)pi(+)-pairs off the proton from threshold to the second resonance region

AU - MAMI Collaboration

AU - TAPS Collaboration

AU - A2 Collaboration

AU - Zehr, F.

AU - Krusche, B.

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. F. B.

AU - Downie, E. J.

AU - Drexler, P.

AU - Glazier, D. I.

AU - Fil'kov, L. V.

AU - Fix, A.

AU - Gregor, R.

AU - Heid, E.

AU - Hornidge, D.

AU - Jaegle, I.

AU - Jahn, O.

AU - Kashevarov, V. L.

AU - Knezevic, A.

AU - Kondratiev, R.

AU - Korolija, M.

AU - Kotulla, M.

AU - Krambrich, D.

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 - Maghrbi, Y.

AU - Martinez, M.

AU - McGeorge, J. C.

AU - Mekterovic, D.

AU - Metag, V.

AU - Nefkens, B. M. K.

AU - Nikolaev, A.

AU - Ostrick, M.

AU - Pedroni, P.

AU - Pheron, F.

AU - Polonski, A.

AU - Watts, D. P.

PY - 2012/7

Y1 - 2012/7

N2 - Precise total cross-sections and invariant-mass distributions have been measured for photoproduction of pion pairs off the proton producing p pi(0)pi(0) and n pi(+)pi(0) final states from the threshold region up to 800 MeV incident photon energy. Additionally, beam helicity asymmetries have been measured in the second resonance region (550 MeV-820 MeV). The experiment was performed at the tagged photon beam of the Mainz MAMI accelerator with the Crystal Ball and TAPS detectors combined to give an almost 4 pi solid-angle electromagnetic calorimeter. The results are much more precise than any previous measurements and confirm the chiral perturbation theory predictions for the threshold behavior of these reactions. In the second resonance region, the invariant-mass distributions of meson-meson and meson-nucleon pairs are in reasonable agreement with model predictions, but none of the models reproduce the asymmetries for the mixed-charge channel.

AB - Precise total cross-sections and invariant-mass distributions have been measured for photoproduction of pion pairs off the proton producing p pi(0)pi(0) and n pi(+)pi(0) final states from the threshold region up to 800 MeV incident photon energy. Additionally, beam helicity asymmetries have been measured in the second resonance region (550 MeV-820 MeV). The experiment was performed at the tagged photon beam of the Mainz MAMI accelerator with the Crystal Ball and TAPS detectors combined to give an almost 4 pi solid-angle electromagnetic calorimeter. The results are much more precise than any previous measurements and confirm the chiral perturbation theory predictions for the threshold behavior of these reactions. In the second resonance region, the invariant-mass distributions of meson-meson and meson-nucleon pairs are in reasonable agreement with model predictions, but none of the models reproduce the asymmetries for the mixed-charge channel.

KW - DOUBLE-PION-PHOTOPRODUCTION

KW - CHIRAL PERTURBATION-THEORY

KW - TOTAL CROSS-SECTION

KW - TAGGED PHOTON SPECTROMETER

KW - HELICITY DEPENDENCE

KW - NUCLEON RESONANCE

KW - SIGMA-MESON

KW - GAMMA

KW - POLARIZATION

KW - EXCITATION

U2 - 10.1140/epja/i2012-12098-1

DO - 10.1140/epja/i2012-12098-1

M3 - Article

SN - 1434-6001

VL - 48

JO - The European Physical Journal A (EPJ A)

JF - The European Physical Journal A (EPJ A)

IS - 7

M1 - 98

ER -

Photoproduction of pi(0)pi(0)- and pi(0)pi(+)-pairs off the proton from threshold to the second resonance region

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Keywords / Materials (for Non-textual outputs)

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