- Spokesperson
- Curtis A. Meyer
- Abstract
- High-statistics measurements of differential cross sections and spin density matrix elements for the reaction γp -> φp 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 φ production angle. The high statistics of the data sample made it necessary to carefully account for the interplay between the φ natural lineshape and effects of the detector resolution, that are found to be comparable in magnitude. We study both the charged- (φ -> K+K-) and neutral- (φ -> K0SK0L) KK decay modes of the φ. 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 φ mass resolution. Our nal results are reported in 10- and mostly 30-MeV-wide sqrt(s) bins for the charged- and the neutral-mode, respectively. Possible eects from K+Λ* channels with pKK final-states are discussed. These present results constitute the most precise and extensive φ photoproduction measurements to date and in conjunction with the ω photoproduction results recently published by CLAS, will greatly improve our understanding of low energy vector meson photoproduction.
- Comment
- The data were obtained using real photons produced via bremsstrahlung from a 4.023-GeV electron beam
- Publication
-
- B.Dey, C.A.Meyer, M.Bellis, M.Williams, and CLAS Collaboration Data analysis techniques, differential cross sections, and spin density matrix elements for the reaction γp -> φp // arXiv:1403.2110v2 [nucl-ex]
- Quantities
- dσ/dcos(θ) ρ00,0 ρ01,0 ρ01,-1
Measurements
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ID | Quantity | Beam | Target | Final state |
Q2min, GeV2 |
Q2max, GeV2 |
Wmin, GeV |
Wmax, GeV |
---|---|---|---|---|---|---|---|---|
E63M1 | dσ/dcos(θ) | γ | p | φ p | 0.0 | 0.0 | 1.985 | 2.835 |
E63M2 | dσ/dcos(θ) | γ | p | φ p | 0.0 | 0.0 | 1.985 | 2.835 |
E63M3 | dσ/dcos(θ) | γ | p | φ p | 0.0 | 0.0 | 1.985 | 2.815 |
E63M4 | ρ00,0 | γ | p | φ p | 0.0 | 0.0 | 1.985 | 2.835 |
E63M5 | ρ01,0 | γ | p | φ p | 0.0 | 0.0 | 1.985 | 2.835 |
E63M6 | ρ01,-1 | γ | p | φ p | 0.0 | 0.0 | 1.985 | 2.835 |
E63M7 | ρ00,0 | γ | p | φ p | 0.0 | 0.0 | 1.985 | 2.835 |
E63M8 | ρ01,0 | γ | p | φ p | 0.0 | 0.0 | 1.985 | 2.835 |
E63M9 | ρ01,-1 | γ | p | φ p | 0.0 | 0.0 | 1.985 | 2.835 |
E63M10 | ρ00,0 | γ | p | φ p | 0.0 | 0.0 | 1.985 | 2.815 |
E63M11 | ρ01,0 | γ | p | φ p | 0.0 | 0.0 | 1.985 | 2.815 |
E63M12 | ρ01,-1 | γ | p | φ p | 0.0 | 0.0 | 1.985 | 2.815 |
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