H. Berghäuser

Publications (5)5.5 Total impact

• Article: Study of the gamma p --> pi0 pi0 p reaction with the Crystal Ball/TAPS at the Mainz

  V. L. Kashevarov, A. Fix, S. Prakhov, P. Aguar-Bartolomé, J. R. M. Annand, H. J. Arends, K. Bantawa, R. Beck, V. Bekrenev, H. Berghäuser, [......], I. I. Strakovsky, I. M. Suarez, I. Supek, C. M. Tarbert, M. Thiel, A. Thomas, M. Unverzagt, D. P. Watts, D. Werthmüller, F. Zehr
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  ABSTRACT: The gamma p --> pi0 pi0 p reaction has been measured from threshold to 1.4 GeV using the Crystal Ball and TAPS photon spectrometers together with the photon tagging facility at the Mainz Microtron. The experimental results include total and differential cross sections as well as specific angular distributions, which were used to extract partial-wave amplitudes. In particular, the energy region below the D13(1520) resonance was studied.
  04/2012;
• Source

  Available from: W. J. Briscoe

  Article: Photoproduction of on protons and the (1700)D33 -resonance

  The Crystal Ball at MAMI, TAPS, and Collaborations, V. L. Kashevarov, A. Fix, P. Aguar-Bartolomé, L. K. Akasoy, J. R. M. Annand, H. J. Arends, K. Bantawa, R. Beck, V. Bekrenev, [......], A. Starostin, I. M. Suarez, I. Supek, C. M. Tarbert, M. Thiel, A. Thomas, M. Unverzagt, D. P. Watts, I. Zamboni, F. Zehr
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  ABSTRACT: Total and differential cross-sections for the reaction gp®p0hp\ensuremath \gamma p\rightarrow\pi^0\eta p have been measured with the Crystal Ball/TAPS detector using the tagged photon facility at the MAMI C accelerator in Mainz. In the energy range Eg = 0.95-1.4\ensuremath E_{\gamma} = 0.95\mbox{--}1.4 GeV the reaction is dominated by the excitation and sequential decay of the D(1700)D33\ensuremath \Delta(1700)D_{33} -resonance. Angular distributions measured with high statistics allow us to determine the ratio of hadronic decay widths GhD/GpS11\ensuremath \Gamma_{\eta\Delta}/\Gamma_{\pi S_{11}} and the ratio of the helicity amplitudes A3/2/A1/2\ensuremath A_{3/2}/A_{1/2} for this resonance.
  European Physical Journal A 04/2012; 42(2):141-149. · 2.19 Impact Factor
• Article: Erratum: Experimental study of the γp→ηp reaction with the Crystal Ball detector at the Mainz Microtron (MAMI-C) [Phys. Rev. C 82, 035208 (2010)]

  E. F. McNicoll, S. Prakhov, I. I. Strakovsky, P. Aguar-Bartolomé, L. K. Akasoy, J. R. M. Annand, H. J. Arends, R. A. Arndt, Ya. I. Azimov, K. Bantawa, [......], I. Supek, M. Thiel, A. Thomas, L. Tiator, M. Unverzagt, D. P. Watts, D. Werthmüller, R. L. Workman, I. Zamboni, F. Zehr
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  ABSTRACT: Here we correct a factor of 2 missed in one of figures and the corresponding sentence in the text. It does not change any conclusions.
  Physical Review C 07/2011; 84(2):29901. · 3.31 Impact Factor
• Source

  Available from: W. J. Briscoe

  Article: First measurement of the circular beam asymmetry in the gamma p --> pi0 eta p reaction

  V. L. Kashevarov, A. Fix, P. Aguar-Bartolomé, L. K. Akasoy, J. R. M. Annand, H.J. Arends, K. Bantawa, R. Beck, V. Bekrenev, H. Berghäuser, [......], I. M. Suarez, I. Supek, C. Tarbert, M. Thiel, A Thomas, M. Unverzagt, D. P. Watts, D. Werthmüller, I. Zamboni, F. Zehr
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  ABSTRACT: The circular photon asymmetry for pi0 eta photoproduction on the proton was measured for the first time at the tagged photon facility of the MAMI C accelerator using the Crystal Ball/TAPS photon spectrometer. The experimental results are interpreted within a phenomenological isobar model that confirms the dominant role of the Delta(1700)D33 resonance. The measured asymmetry allows us to identify small contributions from positive-parity resonances via interference terms with the dominant D33 amplitude. Comment: 11 pages, 3 figures, submitted to Phys.Lett. B
  09/2010;
• Article: Experimental study of the γp→π0π0p reaction with the Crystal Ball/TAPS detector system at the Mainz Microtron

  V. L. Kashevarov, A. Fix, S. Prakhov, P. Aguar-Bartolomé, J. R. M. Annand, H. J. Arends, K. Bantawa, R. Beck, V. Bekrenev, H. Berghäuser, [......], I. I. Strakovsky, I. M. Suarez, I. Supek, C. M. Tarbert, M. Thiel, A. Thomas, M. Unverzagt, D. P. Watts, D. Werthmüller, F. Zehr
  [show abstract] [hide abstract]
  ABSTRACT: The γp→π0π0p reaction has been measured from threshold to 1.4 GeV using the Crystal Ball and TAPS photon spectrometers together with the photon tagging facility at the Mainz Microtron. The experimental results include total and differential cross sections as well as specific angular distributions, which were used to extract partial-wave amplitudes. In particular, the energy region below the D13(1520) resonance was studied.
  Phys. Rev. C. 85(6).