Study of the 3He-eta system in d-p collisions at COSY-11
Abstract
We present preliminary results from dp --> 3He X (X=pi0,eta) measurements near the eta production threshold. The data were taken during a slow ramping of the COSY internal deuteron beam scattered on a proton target. The 3He ejectiles were registered with the COSY-11 detection setup. The ongoing data analysis should deliver high precision data for the dp --> 3He eta total and differential cross sections for the excess energies in the range from threshold up to 9 MeV. The preliminary excitation function for the reaction dp --> 3He pi0 does not show any structure which could originate from the decay of 3He-eta bound state. We present also a threshold excitation curve for the dp --> 3He X channel. Contrary to corresponding results from SATURNE we see no cusp in the vicinity of the eta threshold.
Cite
@article{arxiv.nucl-ex/0603023,
title = {Study of the 3He-eta system in d-p collisions at COSY-11},
author = {J. Smyrski and H. -H. Adam and A. Budzanowski and E. Czerwinski and R. Czyzykiewicz and D. Gil and D. Grzonka and A. Heczko and M. Janusz and L. Jarczyk and B. Kamys and A. Khoukaz and K. Kilian and P. Klaja and J. Majewski and P. Moskal and W. Oelert and C. Piskor-Ignatowicz and J. Przerwa and J. Ritman and T. Rozek and R. Santo and T. Sefzick and M. Siemaszko and A. Taeschner and P. Winter and M. Wolke and P. Wuestner and Z. Zhang and W. Zipper},
journal= {arXiv preprint arXiv:nucl-ex/0603023},
year = {2009}
}
Comments
8 pages; 5 figures; Talk at Eta05 Workshop on Production and Decay of eta and eta-prime Mesons, Cracow, Poland, 15-18 Sep 2005; Acta Phys. Slovaca, in print