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Light Vector Mesons in the Nuclear Medium | | M. H. Wood
; R. Nasseripour
; D. P. Weygand
; C. Djalali
; C. Tur
; U. Mosel
; P. Muehlich
; CLAS Collaboration
; | | Date: |
4 Mar 2008 | | Abstract: | The light vector mesons ($
ho$, $omega$, and $phi$) were produced in
deuterium, carbon, titanium, and iron targets in a search for possible
in-medium modifications to the properties of the $
ho$ meson at normal nuclear
densities and zero temperature. The vector mesons were detected with the CEBAF
Large Acceptance Spectrometer (CLAS) via their decays to $e^{+}e^{-}$. The rare
leptonic decay was chosen to reduce final-state interactions. A combinatorial
background was subtracted from the invariant mass spectra using a
well-established event-mixing technique. The $
ho$ meson mass spectrum was
extracted after the $omega$ and $phi$ signals were removed in a nearly
model-independent way. Comparisons were made between the $
ho$ mass spectra
from the heavy targets ($A > 2$) with the mass spectrum extracted from the
deuterium target. With respect to the $
ho$-meson mass, we obtain a small
shift compatible with zero. Also, we measure widths consistent with standard
nuclear many-body effects such as collisional broadening and Fermi motion. | | Source: | arXiv, 0803.0492 | | Services: | Forum | Review | PDF | Favorites | |
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