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@ARTICLE{Adlarson:841541,
author = {Adlarson, P. and Augustyniak, W. and Bardan, W. and
Bashkanov, M. and Bass, S. D. and Bergmann, F. S. and
Berlowski, M. and Bondar, A. and Buscher, M. and Calen, H.
and Ciepal, I. and Clement, H. and Czerwinski, E. and
Demmich, K. and Engels, Ralf W. and Erven, A. and Erven, W.
and Eyrich, W. and Fedorets, P. and Fohl, K. and Fransson,
K. and Goldenbaum, F. and Goswami, A. and Grigoryev, K. and
Gullstrom, C. -O. and Heijkenskjold, L. and Hejny, V. and
Husken, N. and Jarczyk, L. and Johansson, T. and Kamys, B.
and Kemmerling, G. and Khatri, G. and Khoukaz, A. and
Khreptak, O. and Kirillov, D. A. and Kistryn, S. and
Kleines, H. and Klos, B. and Krzemien, W. and Kulessa, P.
and Kupsc, A. and Kuzmin, A. and Lalwani, K. and Lersch, D.
and Lorentz, B. and Magiera, A. and Maier, R. and
Marciniewski, P. and Marianski, B. and Morsch, H. -P. and
Moskal, P. and Ohm, H. and Parol, W. and del Rio, E. Perez
and Piskunov, N. M. and Prasuhn, D. and Pszczel, D. and
Pysz, K. and Pyszniak, A. and Ritman, J. and Roy, A. and
Rudy, Z. and Rundel, O. and Sawant, S. and Schadmand, S. and
Schatti-Ozerianska, I. and Sefzick, T. and Serdyuk, V. and
Shwartz, B. and Sitterberg, K. and Skorodko, T. and Skurzok,
M. and Smyrski, J. and Sopov, V. and Stassen, R. and
Stepaniak, J. and Stephan, E. and Sterzenbach, G. and
Stockhorst, H. and Szczurek, H. Stroher A. and Trzcinski, A.
and Wolke, M. and Wronska, A. and Wustner, P. and Yamamoto,
A. and Zabierowski, J. and Zielinski, M. J. and Zlomanczuk,
J. and Zupranski, P. and Zurek, M.},
title = {{S}pin dependence of ${\eta}$ meson production in
proton-proton collisions close to threshold},
reportid = {FZJ-2017-08585},
year = {2017},
note = {Accepted for publication in Phys. Rev. Lett},
abstract = {Taking advantage of the high acceptance and axial symmetry
of the WASA-at-COSY detector, and the high degree of the
polarized proton beam of COSY, the reaction $pp{\to}$
$pp{\eta}$ 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 one
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 reveals strong interference of P s and P p partial
waves and cancellation of (P p) and Ss*Sd contributions.
These results rule out the presently available theoretical
predictions for the production mechanism of the ${\eta}$
meson.},
cin = {IKP-1 / IKP-TA / IKP-2 / IKP-4 / PGI-6 / JCNS (München) ;
Jülich Centre for Neutron Science JCNS (München) ;
JCNS-FRM-II / ZEA-2},
cid = {I:(DE-Juel1)IKP-1-20111104 / I:(DE-Juel1)IKP-TA-20111104 /
I:(DE-Juel1)IKP-2-20111104 / I:(DE-Juel1)IKP-4-20111104 /
I:(DE-Juel1)PGI-6-20110106 /
I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)ZEA-2-20090406},
pnm = {612 - Cosmic Matter in the Laboratory (POF3-612)},
pid = {G:(DE-HGF)POF3-612},
typ = {PUB:(DE-HGF)25},
eprint = {1709.04547},
howpublished = {arXiv:1709.04547},
archivePrefix = {arXiv},
SLACcitation = {$\%\%CITATION$ = $arXiv:1709.04547;\%\%$},
pubmed = {pmid:29376676},
url = {https://juser.fz-juelich.de/record/841541},
}