Nuclear-matter modification of decay widths in the $φ\to e^{+}e^{-}$ and $φ\to K^{+}K^{-}$ channels

Details Nuclear-matter modification of decay widths in the $φ\to e^{+}e^{-}$ and $φ\to K^{+}K^{-}$ channels Nuclear-matter modification of decay widths in the $φ\to e^{+}e^{-}$ and $φ\to K^{+}K^{-}$ channels

2006-06-23

arxiv.org/abs/nucl-ex/0606029v4

Phys.Rev.Lett.98:152302,2007

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.98.152302

The invariant mass spectra of $\phi \to K^{+}K^{-}$ are measured in 12 GeV $p+A$ reactions in order to search for the in-medium modification of $\phi$ mesons. The observed $K^{+}K^{-}$ spectra are well reproduced by the relativistic Breit-Wigner function with a combinatorial background shape in three $\beta\gamma$ regions between 1.0 and 3.5. The nuclear mass-number dependence of the yields of the $K^{+}K^{-}$ decay channel is compared to the simultaneously measured $e^{+}e^{-}$ decay channel for carbon and copper targets. We parameterize the production yields as $\sigma (A) = \sigma_0 \times A^\alpha$ and obtain $\alpha_{\phi\to K^+K^-} - \alpha_{\phi\to e^+e^-}$ to be 0.14 $\pm$ 0.12. Limits are obtained for the partial decay widths of $\phi$ mesons in nuclear matter.

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