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

Adlarson, Patrik; Augustyniak, W.; Bardan, W.; Bashkanov, M.; Bass, S. D.; Bergmann, F. S.; Berlowski, M.; Bondar, A.; Buscher, M.; Calén, Hans; Ciepal, I.; Clement, H.; Czerwinski, E.; Demmich, K.; Engels, R.; Erven, A.; Erven, W.; Eyrich, W.; Fedorets, P.; Fohl, K.; Fransson, Kjell; Goldenbaum, F.; Goswami, A.; Grigoryev, K.; Gullström, Carl-Oskar; Heijkenskjöld, Lena; Hejny, V.; Husken, N.; Jarczyk, L.; Johansson, Tord; Kamys, B.; Kemmerling, G.; Khatri, G.; Khoukaz, A.; Khreptak, O.; Kirillov, D. A.; Kistryn, S.; Kleines, H.; Klos, B.; Krzemien, W.; Kulessa, P.; Kupsc, Andrzej; Kuzmin, A.; Lalwani, K.; Lersch, D.; Lorentz, B.; Magiera, A.; Maier, R.; Marciniewski, Pawel; Marianski, B.; Morsch, H. -P; Moskal, P.; Ohm, H.; Parol, W.; del Rio, E. Perez; Piskunov, N. M.; Prasuhn, D.; Pszczel, Damian; 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, Magnus; Wronska, A.; Wustner, P.; Yamamoto, A.; Zabierowski, J.; Zielinski, M. J.; Zlomanczuk, Jozef; Zupranski, P.; Zurek, M.

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

Adlarson, Patrik

Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.

Augustyniak, W.

Natl Ctr Nucl Res, Dept Nucl Phys, Ul Hoza 69, PL-00681 Warsaw, Poland..

Bardan, W.

Jagiellonian Univ, Inst Phys, Prof Stanislawa Lojasiewicza 11, PL-30348 Krakow, Poland..

Bashkanov, M.

Univ Edinburgh, Sch Phys & Astron, James Clerk Maxwell Bldg,Peter Guthrie Tait Rd, Edinburgh EH9 3FD, Midlothian, Scotland..

Bass, S. D.

Bergmann, F. S.

Berlowski, M.

Bondar, A.

Buscher, M.

Calén, Hans

Ciepal, I.

Clement, H.

Czerwinski, E.

Demmich, K.

Engels, R.

Erven, A.

Erven, W.

Eyrich, W.

Fedorets, P.

Fohl, K.

Fransson, Kjell

Goldenbaum, F.

Goswami, A.

Grigoryev, K.

Gullström, Carl-Oskar

Heijkenskjöld, Lena

Hejny, V.

Husken, N.

Jarczyk, L.

Johansson, Tord

Kamys, B.

Kemmerling, G.

Khatri, G.

Khoukaz, A.

Khreptak, O.

Kirillov, D. A.

Kistryn, S.

Kleines, H.

Klos, B.

Krzemien, W.

Kulessa, P.

Kupsc, Andrzej

Kuzmin, A.

Lalwani, K.

Lersch, D.

Lorentz, B.

Magiera, A.

Maier, R.

Marciniewski, Pawel

Marianski, B.

Morsch, H. -P

Moskal, P.

Ohm, H.

Parol, W.

del Rio, E. Perez

Piskunov, N. M.

Prasuhn, D.

Pszczel, Damian

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, Magnus

Wronska, A.

Wustner, P.

Yamamoto, A.

Zabierowski, J.

Zielinski, M. J.

Zlomanczuk, Jozef

Zupranski, P.

Zurek, M.

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2018 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 120, no 2, article id 022002Article in journal (Refereed) Published

Abstract [en]

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 →pp→ppη has been measured close to threshold to explore the analyzing power Ay. The angular distribution of Ay 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 η meson.

Place, publisher, year, edition, pages

2018. Vol. 120, no 2, article id 022002

National Category

Subatomic Physics

Identifiers

URN: urn:nbn:se:uu:diva-341490DOI: 10.1103/PhysRevLett.120.022002ISI: 000419478800004OAI: oai:DiVA.org:uu-341490DiVA, id: diva2:1184549

Available from: 2018-02-21 Created: 2018-02-21 Last updated: 2018-02-21Bibliographically approved

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