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

Adlarson, P.; Augustyniak, W.; Bardan, W.; Bashkanov, M.; Bass, S.  D.; Bergmann, F.  S.; Berłowski, M.; Bondar, A.; Büscher, M.; Calén, H.; Ciepał, I.; Clement, H.; Czerwiński, E.; Demmich, K.; Engels, R.; Erven, A.; Erven, W.; Eyrich, W.; Fedorets, P.; Föhl, K.; Fransson, K.; Goldenbaum, F.; Goswami, A.; Grigoryev, K.; Gullström, C. -O.; Heijkenskjöld, L.; Hejny, V.; Hüsken, N.; Jarczyk, L.; Johansson, T.; Kamys, B.; Kemmerling, G.; Khatri, G.; Khoukaz, A.; Khreptak, O.; Kirillov, D.  A.; Kistryn, S.; Kleines, H.; Kłos, B.; Krzemień, W.; Kulessa, P.; Kupść, A.; Kuzmin, A.; Lalwani, K.; Lersch, D.; Lorentz, B.; Magiera, A.; Maier, R.; Marciniewski, P.; Mariański, B.; Morsch, H. -P.; Moskal, P.; Ohm, H.; Parol, W.; Perez del Rio, E.; Piskunov, N.  M.; Prasuhn, D.; Pszczel, D.; Pysz, K.; Pyszniak, A.; Ritman, J.; Roy, A.; Rudy, Z.; Rundel, O.; Sawant, S.; Schadmand, S.; Schätti-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.; Ströher, H.; Szczurek, A.; Trzciński, A.; Wolke, M.; Wrońska, A.; Wüstner, P.; Yamamoto, A.; Zabierowski, J.; Zieliński, M.  J.; Złomańczuk, J.; Żuprański, P.; Żurek, M.

doi:10.1103/PhysRevLett.120.022002

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.

Spin Dependence of η Meson Production in Proton-Proton Collisions Close to Threshold / Adlarson, P.; Augustyniak, W.; Bardan, W.; Bashkanov, M.; Bass, S. D.; Bergmann, F. S.; Berłowski, M.; Bondar, A.; Büscher, M.; Calén, H.; Ciepał, I.; Clement, H.; Czerwiński, E.; Demmich, K.; Engels, R.; Erven, A.; Erven, W.; Eyrich, W.; Fedorets, P.; Föhl, K.; Fransson, K.; Goldenbaum, F.; Goswami, A.; Grigoryev, K.; Gullström, C. -O.; Heijkenskjöld, L.; Hejny, V.; Hüsken, N.; Jarczyk, L.; Johansson, T.; Kamys, B.; Kemmerling, G.; Khatri, G.; Khoukaz, A.; Khreptak, O.; Kirillov, D. A.; Kistryn, S.; Kleines, H.; Kłos, B.; Krzemień, W.; Kulessa, P.; Kupść, A.; Kuzmin, A.; Lalwani, K.; Lersch, D.; Lorentz, B.; Magiera, A.; Maier, R.; Marciniewski, P.; Mariański, B.; Morsch, H. -P.; Moskal, P.; Ohm, H.; Parol, W.; Perez del Rio, E.; Piskunov, N. M.; Prasuhn, D.; Pszczel, D.; Pysz, K.; Pyszniak, A.; Ritman, J.; Roy, A.; Rudy, Z.; Rundel, O.; Sawant, S.; Schadmand, S.; Schätti-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.; Ströher, H.; Szczurek, A.; Trzciński, A.; Wolke, M.; Wrońska, A.; Wüstner, P.; Yamamoto, A.; Zabierowski, J.; Zieliński, M. J.; Złomańczuk, J.; Żuprański, P.; Żurek, M.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 120:2(2018). [10.1103/PhysRevLett.120.022002]

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

Adlarson, P.;Augustyniak, W.;Bardan, W.;Bashkanov, M.;Bass, S. D.;Bergmann, F. S.;Berłowski, M.;Bondar, A.;Büscher, M.;Calén, H.;Ciepał, I.;Clement, H.;Czerwiński, E.;Demmich, K.;Engels, R.;Erven, A.;Erven, W.;Eyrich, W.;Fedorets, P.;Föhl, K.;Fransson, K.;Goldenbaum, F.;Goswami, A.;Grigoryev, K.;Gullström, C. -O.;Heijkenskjöld, L.;Hejny, V.;Hüsken, N.;Jarczyk, L.;Johansson, T.;Kamys, B.;Kemmerling, G.;Khatri, G.;Khoukaz, A.;Khreptak, O.;Kirillov, D. A.;Kistryn, S.;Kleines, H.;Kłos, B.;Krzemień, W.;Kulessa, P.;Kupść, A.;Kuzmin, A.;Lalwani, K.;Lersch, D.;Lorentz, B.;Magiera, A.;Maier, R.;Marciniewski, P.;Mariański, B.;Morsch, H. -P.;Moskal, P.;Ohm, H.;Parol, W.;Perez del Rio, E.;Piskunov, N. M.;Prasuhn, D.;Pszczel, D.;Pysz, K.;Pyszniak, A.;Ritman, J.;Roy, A.;Rudy, Z.;Rundel, O.;Sawant, S.;Schadmand, S.;Schätti-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.;Ströher, H.;Szczurek, A.;Trzciński, A.;Wolke, M.;Wrońska, A.;Wüstner, P.;Yamamoto, A.;Zabierowski, J.;Zieliński, M. J.;Złomańczuk, J.;Żuprański, P.;Żurek, M.

2018

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 →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.

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	Anno di pubblicazione
	
				2018
			
	Parole chiave
	
				analyzing power, nuclear physics, eta meson
			
	Tipologia
	
				01 Pubblicazione su rivista::01a Articolo in rivista
			
	Citazione
	
				Spin Dependence of 
η
 Meson Production in Proton-Proton Collisions Close to Threshold / Adlarson, P.; Augustyniak, W.; Bardan, W.; Bashkanov, M.; Bass, S.  D.; Bergmann, F.  S.; Berłowski, M.; Bondar, A.; Büscher, M.; Calén, H.; Ciepał, I.; Clement, H.; Czerwiński, E.; Demmich, K.; Engels, R.; Erven, A.; Erven, W.; Eyrich, W.; Fedorets, P.; Föhl, K.; Fransson, K.; Goldenbaum, F.; Goswami, A.; Grigoryev, K.; Gullström, C. -O.; Heijkenskjöld, L.; Hejny, V.; Hüsken, N.; Jarczyk, L.; Johansson, T.; Kamys, B.; Kemmerling, G.; Khatri, G.; Khoukaz, A.; Khreptak, O.; Kirillov, D.  A.; Kistryn, S.; Kleines, H.; Kłos, B.; Krzemień, W.; Kulessa, P.; Kupść, A.; Kuzmin, A.; Lalwani, K.; Lersch, D.; Lorentz, B.; Magiera, A.; Maier, R.; Marciniewski, P.; Mariański, B.; Morsch, H. -P.; Moskal, P.; Ohm, H.; Parol, W.; Perez del Rio, E.; Piskunov, N.  M.; Prasuhn, D.; Pszczel, D.; Pysz, K.; Pyszniak, A.; Ritman, J.; Roy, A.; Rudy, Z.; Rundel, O.; Sawant, S.; Schadmand, S.; Schätti-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.; Ströher, H.; Szczurek, A.; Trzciński, A.; Wolke, M.; Wrońska, A.; Wüstner, P.; Yamamoto, A.; Zabierowski, J.; Zieliński, M.  J.; Złomańczuk, J.; Żuprański, P.; Żurek, M.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 120:2(2018). [10.1103/PhysRevLett.120.022002]

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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1417445

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