Data analysis techniques, differential cross sections, and spin density matrix elements for the reaction $\gamma p \rightarrow \phi p$ - Archive ouverte HAL Access content directly
Journal Articles Physical Review C Year : 2014

## Data analysis techniques, differential cross sections, and spin density matrix elements for the reaction $\gamma p \rightarrow \phi p$

, (1) , (2) , (2) , (2) , (2) , (2)
1
2
B. Dey
• Function : Author
E. Voutier
J. Ball
• Function : Author
M. Garcon
• Function : Author
H. Moutarde
• Function : Author
S. Procureur
• Function : Author
F. Sabatie
• Function : Author

#### Abstract

High-statistics measurements of differential cross sections and spin density matrix elements for the reaction $\gamma p \to \phi p$ have been made using the CLAS detector at Jefferson Lab. We cover center-of-mass energies ($\sqrt{s}$) from 1.97 to 2.84 GeV, with an extensive coverage in the $\phi$ production angle. The high statistics of the data sample made it necessary to carefully account for the interplay between the $\phi$ natural lineshape and effects of the detector resolution, that are found to be comparable in magnitude. We study both the charged- ($\phi \to K^+ K^-$) and neutral- ($\phi \to K^0_S K^0_L$) $K\overline{K}$ decay modes of the $\phi$. Further, for the charged mode, we differentiate between the cases where the final $K^-$ track is directly detected or its momentum reconstructed as the total missing momentum in the event. The two charged-mode topologies and the neutral-mode have different resolutions and are calibrated against each other. Extensive usage is made of kinematic fitting to improve the reconstructed $\phi$ mass resolution. Our final results are reported in 10- and mostly 30-MeV-wide $\sqrt{s}$ bins for the charged- and the neutral-mode, respectively. Possible effects from $K^+ \Lambda^\ast$ channels with $p K\overline{K}$ final-states are discussed. These present results constitute the most precise and extensive $\phi$ photoproduction measurements to date and in conjunction with the $\omega$ photoproduction results recently published by CLAS, will greatly improve our understanding of low energy vector meson photoproduction.

### Dates and versions

in2p3-00957757 , version 1 (11-03-2014)

### Identifiers

• HAL Id : in2p3-00957757 , version 1
• ARXIV :
• DOI :

### Cite

B. Dey, E. Voutier, J. Ball, M. Garcon, H. Moutarde, et al.. Data analysis techniques, differential cross sections, and spin density matrix elements for the reaction $\gamma p \rightarrow \phi p$. Physical Review C, 2014, 89, pp.055208. ⟨10.1103/PhysRevC.89.055208⟩. ⟨in2p3-00957757⟩

### Export

BibTeX TEI Dublin Core DC Terms EndNote Datacite

44 View