Jun 13 – 17, 2011
Europe/Berlin timezone
Proceedings are now available online at <a href="http://www.slac.stanford.edu/econf/C110613/">eConf</a>

Measurement of the in-medium $\phi$-meson width in proton-nucleus collisions

Jun 14, 2011, 5:10 PM
Club 3 (Künstlerhaus)

Club 3


talk Hadrons in Hot and Cold Medium Hadrons in Hot and Cold Medium


Mr Andrey Polyanskiy (IKP, FZ Jülich)


The production of $\phi$-mesons in collisions of 2.83 GeV protons with C, Cu, Ag and Au targets has been measured with the ANKE magnetic spectrometer at the Cooler Synchrotron COSY. The $\phi$ was detected at small angles via its $K^+K^-$ decay branch. The measured target mass dependence of the production cross section can be related to the in-medium $\phi$ width. Comparisons with available model calculations suggest a significant broadening of this width relative to the vacuum value of 4.3~MeV/$c^2$. Since this was a high statistics experiment, with 7000-10000 $\phi$ per target, we were able to study the momentum dependence of the in-medium $\phi$ width and results will be presented in the range $0.6 < p_\phi < 1.6~$GeV/$c$.

Primary author

Mr Andrey Polyanskiy (IKP, FZ Jülich)

Presentation materials