Determination of the η(')-proton scattering length in free space

Taking advantage of both the high mass resolution of the COSY-11 detector and the high energy resolution of the low-emittance proton beam of the cooler synchrotron COSY, we determine the excitation function for the pp→ppη(') reaction close to threshold. Combining these data with previous result...

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Veröffentlicht in:	Physical review letters 2014-08, Vol.113 (6), p.062004-062004, Article 062004
Hauptverfasser:	Czerwiński, E, Moskal, P, Silarski, M, Bass, S D, Grzonka, D, Kamys, B, Khoukaz, A, Klaja, J, Krzemień, W, Oelert, W, Ritman, J, Sefzick, T, Smyrski, J, Täschner, A, Wolke, M, Zieliński, M
Format:	Artikel
Sprache:	eng
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Zusammenfassung:	Taking advantage of both the high mass resolution of the COSY-11 detector and the high energy resolution of the low-emittance proton beam of the cooler synchrotron COSY, we determine the excitation function for the pp→ppη(') reaction close to threshold. Combining these data with previous results, we extract the scattering length for the η(')-proton potential in free space to be Re(a(pη(')))=0±0.43 fm and Im(a(pη(')))=0.37(-0.16)(+0.40) fm.
ISSN:	0031-9007 1079-7114 1079-7114
DOI:	10.1103/PhysRevLett.113.062004