Spin Dependence of η Meson Production in Proton-Proton Collisions Close to Threshold.

  title={Spin Dependence of $\eta$ Meson Production in Proton-Proton Collisions Close to Threshold.},
  author={Patrik Adlarson and W. Augustyniak and W. Bardan and M. Bashkanov and Steven D. Bass and Florian Bergmann and Marcin Berłowski and Alexander E. Bondar and Markus B{\"u}scher and Hans Cal{\'e}n and Izabela Ciepał and H. Clement and Eryk Czerwiński and K. Demmich and Ralf Engels and Andreas Erven and Wilhelm Erven and Wolfgang K. Eyrich and P. V. Fedorets and K. F{\"o}hl and Kjell Fransson and Frank Goldenbaum and Ankita Goswami and Kirill Grigoryev and C. – O. Gullstr{\"o}m and Lena Heijkenskj{\"o}ld and Volker Hejny and N. H{\"u}sken and Lucjan Jarczyk and T. Gunnar Johansson and B. Kamys and G{\"u}nter Kemmerling and G. Khatri and Alfons Khoukaz and Oleksandr Khreptak and Di. Kirillov and St. Kistryn and H. Kleines and B. Kłos and Wojciech Krzemień and Paweł Kulessa and Andrzej Kupś{\'c} and Alexander Kuzmin and Kavita Lalwani and Daniel Lersch and Bernd Alfred Lorentz and Andrzej Magiera and Rudolf Maier and Pawel Marciniewski and Bohdan Mariański and H. Peter Morsch and Paweł Moskal and H. Ohm and W. Parol and Elena Perez del rio and N. M. Piskunov and Dieter Prasuhn and Damian Pszczel and Krzysztof Pysz and Andrzej Pyszniak and James Ritman and A. Roy and Zbigniew Rudy and Oleksandr Rundel and Siddhesh Sawant and Susan Schadmand and I. Sch{\"a}tti-Ozerianska and Th. Sefzick and V. Z. Serdyuk and Boris A. Shwartz and K. Sitterberg and T. Yu. Skorodko and Magdalena Skurzok and Jerzy Smyrski and V. S. Sopov and Rolf Stassen and Joanna Stepaniak and Elżbieta Stephan and G. Sterzenbach and Hans Stockhorst and H. Str{\"o}her and Antoni Szczurek and Andrzej Trzciński and Magnus Wolke and Aleksandra Wrońska and P. Wüstner and A. Yamamoto and Janusz Zabierowski and Marcin Zielinski and Jozef Zlomanczuk and P. Żupr{\'a}nski and Marian Zurek},
  journal={Physical review letters},
  volume={120 2},
Taking advantage of the high acceptance and axial symmetry of the WASA-at-COSY detector, and the high polarization degree of the proton beam of COSY, the reaction p[over →]p→ppη has been measured close to threshold to explore the analyzing power A_{y}. The angular distribution of A_{y} is determined with the precision improved by more than 1 order of magnitude with respect to previous results, allowing a first accurate comparison with theoretical predictions. The determined analyzing power is… Expand
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Measurements of the analyzing power for the pp-->pp eta reaction have been performed and reveal that the excitation of the nucleon to the S11(1535) resonance is predominantly due to the exchange of the pi meson between the colliding nucleons. Expand
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The dynamics of η-meson production and the interaction of η mesons with nucleons can be studied using the ~ ! ppη reaction via measurements of the analyzing power Ay. To this end, we have performed aExpand
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The dynamics of η meson production and the interaction of η mesons with nucleons can be studied using the p p →ppη reaction via measurements of the analyzing power A y . To this end, we haveExpand
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Excitation functions of the analyzing power in pp--> scattering from 0.45 to 2.5 GeV
The resulting excitation functions and angular distributions of high internal consistency have significant impact on the recent phase shift solution SAID SP99, in particular, on the spin triplet phase shifts between 1000 and 1800 MeV, and demonstrate the limited predictive power of single-energy phase shift solutions at these energies. Expand