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  1. No Access

    Article

    Determination of the \( \eta\) mass with the Crystal Ball at MAMI-B

    A new precise determination of the \( \eta\) meson mass is presented. It is based on a measurement of the threshold for...

    A. Nikolaev, P. Aguar-Bartolomé, J. Ahrens… in The European Physical Journal A (2014)

  2. Article

    Open Access

    Measurement of the beam-helicity asymmetry I⊙ in the photoproduction of \( \pi^{0}\) \( \pi^{\pm}\) pairs off protons and off neutrons

    Beam-helicity asymmetries have been measured at the MAMI accelerator in Mainz for the photoproduction of mixed-charge pion pairs in the reactions ...

    M. Oberle, J. Ahrens, J. R. M. Annand, H. J. Arends… in The European Physical Journal A (2014)

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  3. No Access

    Article

    Coherent photoproduction of π0- and η-mesons off 7Li

    Coherent photoproduction of π0-mesons from threshold (E th ≈ 136 MeV) throughout the Δ-resonance region and of η-mesons close to the production threshold (E ...

    Y. Maghrbi, B. Krusche, J. Ahrens, J. R. M. Annand… in The European Physical Journal A (2013)

  4. No Access

    Article

    Photoproduction of π0π0 - and π0π+ -pairs off the proton from threshold to the second resonance region

    Precise total cross-sections and invariant-mass distributions have been measured for photoproduction of pion pairs off the proton producing ...

    F. Zehr, B. Krusche, P. Aguar, J. Ahrens… in The European Physical Journal A (2012)

  5. No Access

    Article

    Radiative π0 photoproduction on protons in the Δ+ (1232) region

    The reaction γp → pπ 0γ′ has been measured with the Crystal Ball/TAPS detectors using the energy-tagged photon beam at the electron accelerator facility MAMI-B. Energy and angular differen...

    S. Schumann, B. Boillat, E. J. Downie… in The European Physical Journal A (2010)

  6. No Access

    Article

    Photoproduction of \( \pi^{0}_{}\) \( \eta\) on protons and the \( \Delta\) (1700)D33 -resonance

    Total and differential cross-sections for the reaction \(\ensuremath \gamma p\rightarrow\pi^0\eta p\) have been measure...

    V. L. Kashevarov, A. Fix, P. Aguar-Bartolomé… in The European Physical Journal A (2009)

  7. No Access

    Article

    Determination of the Dalitz plot parameter \( \alpha\) for the decay \( \eta\) → 3 \( \pi^{0}_{}\) with the Crystal Ball at MAMI-B

    A precise measurement of the Dalitz plot parameter, \( \alpha\) , for the

    M. Unverzagt, P. Aguar-Bartolomé, J. Ahrens… in The European Physical Journal A (2009)