Journal article
Authors list: Adlarson, P.; Augustyniak, W.; Bardan, W.; Bashkanov, M.; Bass, S. D.; Bergmann, F. S.; Berlowski, M.; Bondar, A.; Buscher, M.; Calen, H.; Ciepal, I.; Clement, H.; Czerwinski, E.; Demmich, K.; Engels, R.; Erven, A.; Erven, W.; Eyrich, W.; Fedorets, P.; Fohl, K.; Fransson, K.; Goldenbaum, F.; Goswami, A.; Grigoryev, K.; Gullstrom, C. -O.; Heijkenskjold, L.; Hejny, V.; Husken, N.; Jarczyk, L.; Johansson, T.; Kamys, B.; Kemmerling, G.; Khatri, G.; Khoukaz, A.; Khreptak, O.; Kirillov, D. A.; Kistryn, S.; Kleines, H.; Klos, B.; Krzemien, W.; Kulessa, P.; Kupsc, A.; Kuzmin, A.; Lalwani, K.; Lersch, D.; Lorentz, B.; Magiera, A.; Maier, R.; Marciniewski, P.; Marianski, B.; Morsch, H. -P.; Moskal, P.; Ohm, H.; Parol, W.; del Rio, E. Perez; Piskunov, N. M.; Prasuhn, D.; Pszczel, D.; Pysz, K.; Pyszniak, A.; Ritman, J.; Roy, A.; Rudy, Z.; Rundel, O.; Sawant, S.; Schadmand, S.; Schatti-Ozerianska, I.; Sefzick, T.; Serdyuk, V.; Shwartz, B.; Sitterberg, K.; Skorodko, T.; Skurzok, M.; Smyrski, J.; Sopov, V.; Stassen, R.; Stepaniak, J.; Stephan, E.; Sterzenbach, G.; Stockhorst, H.; Stroeher, H.; Szczurek, A.; Trzcinski, A.; Wolke, M.; Wronska, A.; Wustner, P.; Yamamoto, A.; Zabierowski, J.; Zielinski, M. J.; Zlomanczuk, J.; Zupranski, P.; Zurek, M.
Publication year: 2018
Journal: Physical Review Letters
Volume number: 120
Issue number: 2
ISSN: 0031-9007
eISSN: 1079-7114
DOI Link: https://doi.org/10.1103/PhysRevLett.120.022002
Publisher: American Physical Society
Abstract:
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 right arrowp -> pp eta 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 consistent with zero for an excess energy of Q = 15 MeV, signaling s-wave production with no evidence for higher partial waves. At Q = 72 MeV the data reveal strong interference of Ps and Pp partial waves and cancellation of (Pp)(2) and Ss*Sd contributions. These results rule out the presently available theoretical predictions for the production mechanism of the eta meson.
Citation Styles
Harvard Citation style: Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bass, S., Bergmann, F., et al. (2018) Spin Dependence of η Meson Production in Proton-Proton Collisions Close to Threshold, Physical Review Letters, 120(2), Article 022002. https://doi.org/10.1103/PhysRevLett.120.022002
APA Citation style: Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bass, S., Bergmann, F., Berlowski, M., Bondar, A., Buscher, M., Calen, H., Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., ...Zurek, M. (2018). Spin Dependence of η Meson Production in Proton-Proton Collisions Close to Threshold. Physical Review Letters. 120(2), Article 022002. https://doi.org/10.1103/PhysRevLett.120.022002
Keywords
COSY; FACILITY; NUCLEON; QUASI-FREE
