Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mfsku..42....1i&link_type=abstract
Memoirs of the Faculty of Science, Kyoto University, Series of Physics, Astrophysics, Geophysics and Chemistry, (ISSN 0368-9689)
Astronomy and Astrophysics
Astrophysics
Elementary Particles
Scientific paper
We have measured K+K- invariant mass spectra in 12-GeV p+A interaction with a newly constructed spectrometer at the primary beam line in KEK Proton-Synchrotron. The aim of the expriment was to dedect in-medium modification of the φ meson, which is theoretically predicted as a consequence of partially-restored chiral-symmetry at normal nuclear-matter density. The spectrometer was designed to measure slowly moving φ mesons with βγlab from 1 to 3. Significant portion of such φ mesons will decay inside a nucleus, and the observed mass spectrum should be sensitive to the medium effect. The observed K+K- spectra show a clear peak of φ→K+K- decays. The kinematical distributions of the φ mesons are well reproduced by the nuclear cascade code JAM. Nuclear mass-number dependence of the φ production is determined to be A1.01±0.09, which is also consistent with the JAM simulation with a reasonable agreement in the absolute cross sections. In the K+K- spectra we have observed an enhancement below the φ peak where the dominant source in JAM is from decays of a0(980)/f0(980) mesons. We have determined the ratios of a0/f0→K+K- to φ&rarrK+K- as 37.7±10.3% for the light nuclear targets (carbon and polyethylene) and 27.2±10.1% for the heavy nuclear targets (copper and gadlinium), by allowing the scaling of the a0/f0 production cross-section in JAM. The absence of nuclear size dependence in these ratios indicates such an enhancement can not be attributed to the in-media mass modification of the φ meson which should have a strong mass number dependence.
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