Abstract
The production of ϕ mesons in the collisions of 2.83 GeV protons with C, Cu, Ag, and Au at forward angles has been measured via the ϕ→K+K− decay using the COSY-ANKE magnetic spectrometer. The ϕ meson production cross section follows a target mass dependence of A0.56±0.03 in the momentum region of 0.6–1.6 GeV/c. The comparison of the data with model calculations suggests that the in-medium ϕ width is about an order of magnitude larger than its free value.
Highlights
The production of φ mesons in the collisions of 2.83 GeV protons with C, Cu, Ag, and Au at forward angles has been measured via the φ → K + K − decay using the COSY-ANKE magnetic spectrometer
Hadronic models [3,4,5] predict an increase in the width of low-momentum φ mesons in cold nuclear matter at nuclear saturation density by up to a factor of ten compared to the free value, whereas an insignificant mass shift is expected in both these models and in QCD sum rule studies [6,7]
Dileptons from φ → e+e−/μ+μ− decays experience no strong final-state interactions in a nucleus so that any broadening of the φ spectral shape could be directly tested by examining dilepton mass spectra produced by elementary (γ, π, p) probes, provided the necessary cuts are applied on the low φ momenta [8,9]
Summary
The production of φ mesons in the collisions of 2.83 GeV protons with C, Cu, Ag, and Au at forward angles has been measured via the φ → K + K − decay using the COSY-ANKE magnetic spectrometer. The φ meson production cross section follows a target mass dependence of A0.56±0.03 in the momentum region of 0.6– 1.6 GeV/c.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
