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Study of pp{yields}pp{eta} reaction at threshold; Etude de la reaction pp{yields}pp{eta} au seuil

Abstract

The {eta} production has been studied through the pp {yields} pp{eta} reaction at threshold. Data were taken at the Synchrotron of the ``Laboratoire National Saturne``. The detection in coincidence of the two protons scattered near 0 deg and analysed with the magnetic spectrometer SPES3 allows the reconstruction of missing mass spectra for the {eta} signature. A simulation program which takes into account all the experimental set up characteristics has been realized and tested through the pp {yields} d{pi}{sup +} reaction detected simultaneously with pp {yields} pp{eta}. The generated proton momentum spectra for pp {yields} pp{eta} show a pronounced {eta} mass dependence. This characteristic, connected to the kinematical properties of pp {yields} pp{eta} at threshold, is used to extract the mass of the meson {eta}. The obtained value, m{sub {eta}} = 547.65 {+-} 0.18 MeV, is in good agreement with measurement done recently through the pd {yields} {sup H}e{eta} reaction. The total cross section {sigma}{sub t} of pp {yields} pp{eta} measured at 1260, 1265 and 1300 MeV presents a strong energy dependence. This cross section increases less with energy than the phase-space. The influence of p-p and {eta}-p final state interactions in our measurements is studied. Our results are compared with  More>>
Authors:
Publication Date:
Nov 01, 1994
Product Type:
Thesis/Dissertation
Report Number:
CRN-94-61
Reference Number:
SCA: 662340; PA: AIX-27:020666; EDB-96:049255; NTS-96:015335; SN: 96001551365
Resource Relation:
Other Information: TH: These (D. es Sc.).; PBD: Nov 1994
Subject:
66 PHYSICS; ETA MESONS; PROTON-PROTON INTERACTIONS; BARYONS; COINCIDENCE SPECTROMETRY; COMPUTERIZED SIMULATION; CROSS SECTIONS; DEUTERIUM TARGET; DRIFT CHAMBERS; FINAL-STATE INTERACTIONS; HYDROGEN 1 TARGET; MAGNETIC SPECTROMETERS; MISSING-MASS SPECTRA; PHOSPHORS; PION DETECTION; PROTON REACTIONS; PROTON SPECTRA; SATURNE
OSTI ID:
189693
Research Organizations:
Strasbourg-1 Univ., 67 (France). Centre de Recherches Nucleaires
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Other: ON: DE96616419; TRN: FR9504414020666
Availability:
INIS; OSTI as DE96616419
Submitting Site:
FRN
Size:
106 p.
Announcement Date:

Citation Formats

Taleb, A. Study of pp{yields}pp{eta} reaction at threshold; Etude de la reaction pp{yields}pp{eta} au seuil. France: N. p., 1994. Web.
Taleb, A. Study of pp{yields}pp{eta} reaction at threshold; Etude de la reaction pp{yields}pp{eta} au seuil. France.
Taleb, A. 1994. "Study of pp{yields}pp{eta} reaction at threshold; Etude de la reaction pp{yields}pp{eta} au seuil." France.
@misc{etde_189693,
title = {Study of pp{yields}pp{eta} reaction at threshold; Etude de la reaction pp{yields}pp{eta} au seuil}
author = {Taleb, A}
abstractNote = {The {eta} production has been studied through the pp {yields} pp{eta} reaction at threshold. Data were taken at the Synchrotron of the ``Laboratoire National Saturne``. The detection in coincidence of the two protons scattered near 0 deg and analysed with the magnetic spectrometer SPES3 allows the reconstruction of missing mass spectra for the {eta} signature. A simulation program which takes into account all the experimental set up characteristics has been realized and tested through the pp {yields} d{pi}{sup +} reaction detected simultaneously with pp {yields} pp{eta}. The generated proton momentum spectra for pp {yields} pp{eta} show a pronounced {eta} mass dependence. This characteristic, connected to the kinematical properties of pp {yields} pp{eta} at threshold, is used to extract the mass of the meson {eta}. The obtained value, m{sub {eta}} = 547.65 {+-} 0.18 MeV, is in good agreement with measurement done recently through the pd {yields} {sup H}e{eta} reaction. The total cross section {sigma}{sub t} of pp {yields} pp{eta} measured at 1260, 1265 and 1300 MeV presents a strong energy dependence. This cross section increases less with energy than the phase-space. The influence of p-p and {eta}-p final state interactions in our measurements is studied. Our results are compared with theoretical predictions and assess the dominant character of the baryonic resonance N{sup *}(1535) in the {eta} mechanism production at threshold. These experimental results give an energy dependence which is not well reproduced by the theoretical predictions. This discrepancy could be an incorrect description of the {eta}-p interaction in the models. (author). 48 refs., 60 figs., 15 tabs.}
place = {France}
year = {1994}
month = {Nov}
}