Determination of the [eta]'-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 arrow right pp[eta]' reaction close to threshold. Combining these data with p...

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Bibliographic Details
Published in:Physical review letters 2014-08, Vol.113 (6)
Main Authors: Czerwinski, E, Moskal, P, Silarski, M, Bass, S D, Grzonka, D, Kamys, B, Khoukaz, A, Klaja, J, Krzemien, W, Oelert, W
Format: Article
Language:English
Subjects:
Coolers
Detectors
Energy resolution
Excitation
Proton beams
Scattering
Synchrotrons
Thresholds
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Summary: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 arrow right pp[eta]' reaction close to threshold. Combining these data with previous results, we extract the scattering length for the [eta]'-proton potential in free space to be Re(ap[eta]') =0+ or -0.43 fm and Im(ap[eta]')=0.37-0.16+0.40 fm.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.113.062004