Search for medium modification of the $ρ$ meson

Details Search for medium modification of the $ρ$ meson Search for medium modification of the $ρ$ meson

2007-07-16

arxiv.org/abs/0707.2324v3

Phys.Rev.Lett.99:262302,2007

Physics

Nuclear Physics

Nuclear Experiment

8 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.99.262302

The photoproduction of vector mesons on various nuclei has been studied using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Laboratory. The vector mesons, $\rho$, $\omega$, and $\phi$, are observed via their decay to $e^+e^-$, in order to reduce the effects of final state interactions in the nucleus. Of particular interest are possible in-medium effects on the properties of the $\rho$ meson. The $\rho$ spectral function is extracted from the data on various nuclei, carbon, iron, and titanium, and compared to the spectrum from liquid deuterium, which is relatively free of nuclear effects. We observe no significant mass shift for the $\rho$ meson; however, there is some widening of the resonance in titanium and iron, which is consistent with expected collisional broadening.

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