在美因茨微tron加速器（MAMI）上对η和η'光生过程的研究。
Study of η and η' Photoproduction at MAMI.
作者信息
Kashevarov V L, Ott P, Prakhov S, Adlarson P, Afzal F, Ahmed Z, Akondi C S, Annand J R M, Arends H J, Beck R, Braghieri A, Briscoe W J, Cividini F, Codling R, Collicott C, Costanza S, Denig A, Downie E J, Dieterle M, Ferretti Bondy M I, Fil'kov L V, Fix A, Gardner S, Garni S, Glazier D I, Glowa D, Gradl W, Gurevich G, Hamilton D J, Hornidge D, Howdle D, Huber G M, Käser A, Kay S, Keshelashvili I, Kondratiev R, Korolija M, Krusche B, Linturi J, Lisin V, Livingston K, MacGregor I J D, MacRae R, Mancell J, Manley D M, Martel P P, McGeorge J C, McNicol E, Middleton D G, Miskimen R, Mornacchi E, Mullen C, Mushkarenkov A, Neiser A, Oberle M, Ostrick M, Otte P B, Oussena B, Paudyal D, Pedroni P, Polyanski V V, Rajabi A, Reicherz G, Robinson J, Rosner G, Rostomyan T, Sarty A, Schott D M, Schumann S, Sfienti C, Sokhoyan V, Spieker K, Steffen O, Strandberg B, Strakovsky I I, Strub Th, Supek I, Taragin M F, Thiel A, Thiel M, Tiator L, Thomas A, Unverzagt M, Wagner S, Watts D P, Werthmüller D, Wettig J, Witthauer L, Wolfes M, Workman R L, Zana L
机构信息
Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany.
Lebedev Physical Institute, 119991 Moscow, Russia.
出版信息
Phys Rev Lett. 2017 May 26;118(21):212001. doi: 10.1103/PhysRevLett.118.212001.
The reactions γp→ηp and γp→η^{'}p are measured from their thresholds up to the center-of-mass energy W=1.96 GeV with the tagged-photon facilities at the Mainz Microtron, MAMI. Differential cross sections are obtained with unprecedented statistical accuracy, providing fine energy binning and full production-angle coverage. A strong cusp is observed in the total cross section for η photoproduction at the energies in the vicinity of the η^{'} threshold, W=1896 MeV (E_{γ}=1447 MeV). Within the framework of a revised ηMAID isobar model, the cusp, in connection with a steep rise of the η^{'} total cross section from its threshold, can only be explained by a strong coupling of the poorly known N(1895)1/2^{-} state to both ηp and η^{'}p. Including the new high-accuracy results in the ηMAID fit to available η and η^{'} photoproduction data allows the determination of the N(1895)1/2^{-} properties.
利用美因茨微tron（MAMI）的标记光子设施，测量了反应γp→ηp和γp→η′p，测量范围从阈值到质心能量W = 1.96 GeV。以空前的统计精度获得了微分截面，提供了精细的能量分档和全生产角覆盖。在η′阈值附近的能量W = 1896 MeV（Eγ = 1447 MeV）处，观察到η光产生的总截面中有一个强烈的尖点。在修正的ηMAID同位旋模型框架内，该尖点与η′总截面从其阈值开始的急剧上升相关，只能通过鲜为人知的N(1895)1/2⁻态与ηp和η′p的强耦合来解释。将新的高精度结果纳入对现有η和η′光产生数据的ηMAID拟合中，可以确定N(1895)1/2⁻的性质。
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