Measurement of the g p -> K^0 Sigma^+ reaction with the Crystal Ball/TAPS detectors at the Mainz Microtron
P. Aguar-Bartolomé, J. R. M. Annand, H. J. Arends, K. Bantawa, R. Beck, V. Bekrenev, H. Berghäuser, A. Braghieri, W. J. Briscoe, J. Brudvik, S. Cherepnya, R. F.… 展开作者
P. Aguar-Bartolomé, J. R. M. Annand, H. J. Arends, K. Bantawa, R. Beck, V. Bekrenev, H. Berghäuser, A. Braghieri, W. J. Briscoe, J. Brudvik, S. Cherepnya, R. F. B. Codling, C. Collicott, B. Demissie, M. Dieterle, E. J. Downie, P. Drexler, L. V. Fil'kov, A. Fix, D. I. Glazier, R. Gregor, D. Hamilton, E. Heid, D. Hornidge, D. Howdle, L. Isaksson, I. Jaegle, O. Jahn, T. C. Jude, V. L. Kashevarov, I. Keshelashvili, R. Kondratiev, M. Korolija, M. Kotulla, A. Koulbardis, S. Kruglov, B. Krusche, V. Lisin, K. Livingston, I. J. D. MacGregor, Y. Maghrbi, J. Mancel, D. M. Manley, E. F. McNicoll, D. Mekterovic, V. Metag, A. Mushkarenkov, B. M. K. Nefkens, A. Nikolaev, R. Novotny, M. Oberle, H. Ortega, M. Ostrick, P. Ott, P. B. Otte, B. Oussena, P. Pedroni, F. Pheron, A. Polonski, S. Prakhov, J. Robinson, G. Rosner, T. Rostomyan, S. Schumann, M. H. Sikora, D. I. Sober, A. Starostin, I. I. Strakovsky, I. M. Suarez, I. Supek, C. M. Tarbert, M. Thiel, A. Thomas, M. Unverzagt, D. P. Watts, D. Werthmüller, L. Witthauer, F. Zehr.
利用晶体球和TAPS多光子谱仪以及美因茨微波加速器研究所的光子标记设备，从阈值到Eg=1.45 GeV（W_cm=1.9 GeV）测量了g p -> K^0 Sigma^+反应。在本实验中，通过假设K^0_S -> pi^0 pi^0和Sigma^+ -> pi^0 p，在3 pi^0 p终态下寻找该反应。实验结果包括反冲超子的全截面和微分截面以及极化。新的数据极大地改进了在测量能量范围内关于g p -> K^0 Sigma^+反应的经验知识。将结果与以前的测量和模型预测进行比较。结果表明，将当前的g p -> K^0 Sigma^+结果添加到现有数据中，可以更好地用各种模型描述该反应。
英文摘要：
The g p -> K^0 Sigma^+ reaction has been measured from threshold to Eg=1.45 GeV (W_cm=1.9 GeV) using the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. In the present experiment, this reaction was searched for in the 3pi^0 p final state, by assuming K^0_S -> pi^0 pi^0 and Sigma^+ -> pi^0 p. The experimental results include total and differential cross sections as well as the polarization of the recoil hyperon. The new data significantly improve empirical knowledge about the g p -> K^0 Sigma^+ reaction in the measured energy range. The results are compared to previous measurements and model predictions. It is demonstrated that adding the present g p -> K^0 Sigma^+ results to existing data allowed a better description of this reaction with various models.
A new determination of the eta transition form factor in the Dalitz decay eta -> e^+ e^- gamma with the Crystal Ball/TAPS detectors at the Mainz Microtron
New high-statistics measurement of the $π^0 \to e^+e^-γ$ Dalitz decay at the Mainz Microtron
University of Mainz（美因茨大学）；University of Basel（巴塞尔大学）；University of Bonn（波恩大学）；University of Regina（里贾纳大学）；SUPA School of Physics and Astronomy, University of Glasgow（格拉斯哥大学物理与天文学学院）；Department of Physics, University of York（约克大学物理系）；Joint Institute for Nuclear Research（联合核研究所）；INFN Sezione di Pavia（帕维亚 INFN 分部）；The George Washington University（乔治华盛顿大学）
Photoproduction of pi^0 eta on protons and the Delta(1700)D_{33} resonance
利用位于美因茨的MAMI C加速器上的标记光子装置，用Crystal Ball/TAPS探测器测量了反应γ p -> pi^o eta p的总截面和微分截面。在E_γ =0.95- 1.4GeV的能量范围内，反应主要由Delta（1700）D_（33）共振的激发和顺序衰变所控制。高统计量的角分布测量使我们能够确定这种共振的强子衰变宽度比Γ_{ηΔ}/Γ_{π S 11}和螺旋度振幅比A_{3/2} / A_{1/2}。
Beam Steering and Radiation Generation of Electrons in Bent Crystals in the Sub-GeV Domain
University of Ferrara（费拉拉大学）；INFN Ferrara（意大利国家核物理研究所费拉拉分部）；Department of Physics, University of Padua（帕多瓦大学物理系）；INFN Laboratori Nazionali di Legnaro（意大利国家核物理研究所莱尼亚罗国家实验室）；Institut für Kernphysik, Universität Mainz（美因茨大学核物理研究所）
