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

Abstract

The invariant mass spectra of $\varphi \to K^{+}{K}^{-}$ are measured in 12 GeV $p+A$ reactions in order to search for the in-medium modification of $\varphi$ 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 ${\alpha }_{\varphi \to K^{+}{K}^{-}}-{\alpha }_{\varphi \to e^{+}{e}^{-}}$ to be 0.14 $\pm$ 0.12. Limits are obtained for the partial decay widths of $\varphi$ mesons in nuclear matter.

5 pages, 4 figures

References in corpus (1)

• Nuclear mass number dependence of inclusive production of omega and phi mesons in 12 GeV p + A collisions

Cited by in corpus (8)

• Measurements of $\varphi$ meson production in relativistic heavy-ion collisions at RHIC
• Inclusive $\omega$ photoproduction from nuclei and $\omega$ in the nuclear medium
• Study of possible ωbound states in nuclei with the (γ,p) reaction
• Near-threshold Photoproduction of Phi Mesons from Deuterium
• A-dependence of phi-meson production in p+A collisions
• $\varphi$ meson properties in nuclear matter from QCD sum rules with chirally separated four-quark condensates
• Studying the in-medium $\varphi$ meson spectrum through kaons in proton-nucleus reactions
• Velocity dependence of the mass modifications of $\rho$ and $\omega$ mesons in 12 GeV $p+A$ reactions