Article

Dynamics of the near threshold eta meson production in proton-proton interaction

12/2007; DOI: 10.1007/978-3-540-85144-8_47
Source: arXiv

ABSTRACT We present the results of measurements of the analysing power for the p(pol)p --> pp eta reaction at the excess energies of Q=10 and 36 MeV, and interpret these results within the framework of the meson exchange models. The determined values of the analysing power at both excess energies are consistent with zero implying that the eta meson is produced predominantly in s-wave.

0 Followers
 · 
97 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We present the construction of a planar drift chamber with wires stretched between two arms of a c-shaped aluminum frame. The special shape of the frame allows to extend the momentum acceptance of the COSY-11 detection system towards lower momenta without suppressing the high-momentum particles. The proposed design allows for construction of tracking detectors covering small angles with respect to the beam, which can be installed and removed without dismounting the beam-pipe. For a three-dimensional track reconstruction a computer code was developed using a simple algorithm of hit pre-selection.
    Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 02/2005; 541(3-541):574-582. DOI:10.1016/j.nima.2004.12.006 · 1.32 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We investigate the pp --> pp eta and pn --> pn eta reactions within an effective Lagrangian model for laboratory kinetic energies ranging from very close to eta meson production threshold to about 10 GeV. Production amplitudes include contributions from the mechanism of excitation, propagation and decay of N*(1535), N*(1650), and N*(1710) baryonic resonances. The initial interaction between two incoming nucleons is modeled by the exchange of pi, rho, omega and sigma mesons where the vertex parameters are taken to be the same as those used in the previous applications of this model. Parameters of the resonance vertices also have been taken from our earlier studies wherever applicable. Calculations have been done for total as well as differential eta production cross sections. To describe the data for energies closer to the production threshold final state interactions among the out-going particles have been included by means of a generalized Watson-Migdal method. Terms corresponding to the excitation of N*(1535) resonance and pion exchange process dominate the cross sections. With a single set of vertex parameters our model is able to describe the available data well on total cross sections for beam energies ranging from close to threshold to upto 10 GeV.
    Physical Review C 02/2007; 75(5). DOI:10.1103/PHYSREVC.75.055201 · 3.88 Impact Factor

Full-text (4 Sources)

Download
83 Downloads
Available from
May 28, 2014